Session Index

In this talk, we will demonstrate novel optoelectronics realized by using band-engineered vdW heterostructures. Specifically, we will show BP-based mid-infrared light emitting diodes and photodetectors that could exhibit excellent optoelectronic properties, including linear-dichroic photoresponses, high speed, high quantum efficiency and long-term stability at room temperature. Via leveraging the integrability of vdW heterostructures, we further show that our developed mid-infrared devices can be readily coupled with mid-infrared SOI waveguides for on-chip sensing and light emissions. Additionally, we will present novel magneto-optoelectronics, accomplished by integrating emerging vdW magnets with monolayer TMDs, and discuss their future potential applications.

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Tri-layer molybdenum disulfide (MoS2) is fabricated into top-gate transistors for memory device applications. By using the atomic layer etching technique before the source/drain formation, one and two isolated MoS2 layers are fabricated on top of two and one layers of MoS2 channels. Due to the van der Waals attachment instead of chemical bonds between MoS2 layers, a long retention time of electrons stored at the isolated MoS2 layers are observed for the devices. The observation of charge storage in thin 2D material layers will be advantageous for the development of memory devices with reduced linewidths.

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In this work, Landau levels with the same energy spacing but different topological
numbers are produced by chiral strain-engineering. Moreover, topological edge states are
formed by combining two patterns with opposite synthetic gauge fields. By tuning the gauge
fields, topological edge states with ultra-short localization lengths can be constructed.

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In this work, single crystals of SnS1-xSex series (x=0;0.2;0.4;0.5;0.6;0.8;1) have been grown by CVT. From analyzing XRD and HRTEM, SnS1-xSex are crystallized in the orthorhombic structure. Angular-dependent polarized Raman shows noticeable change depending on polarization angle, verifying their in-plane anisotropy behavior. The bandgap transition has been obtained from polarized-thermoreflectance, which varies from 0.94 eV (SnSe) to 1.23 eV (SnS) with absorption ~107. Hall-effect and thermoelectric measurements revealed SnS1-xSex are p-type semiconductors with carrier densities larger than 1017 cm−3. SnSe achieved the highest ZT with ZT 0.086. These findings represent that SnS1-xSex suitable for nanoelectronic and nanophotonic devices in near future.

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Evaluating the manufacturing process using ultrasonic waves is an advanced non-destructive inspection technique. Aluminum is the most abundant metallic element on earth and widely used in integrated circuits. We studied the physical mechanism of optically detecting and generating picosecond ultrasonic pulses in aluminum nanofilm, and compared the changes in the detection region under the influence of the surface plasmon effect.

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We investigate the chirality of meta-GMR composed of rotated nanofin on planar waveguide. The characteristic of GMR is that it will resonate within the waveguide structure and generate diffraction within the structure in a specific wavelength. In this study, we change the period, angle, thickness, and incident light source of nanofin to explore the characteristics of various aspects, and found that the resonance peaks of the left and right circularly polarized light are different under the specific period and thickness of nanofin. In our simulation, the circular dichroism (CD) is 0.7.

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A liquid refractive index (RI) sensor was realized using period-chirped guided mode resonance (PC-GMR) filter defined by laser interference lithography. As-realized PC-GMR-based liquid RI sensor demonstrates a detection limit of 1.54x10^(-3) RIU/pixel and corresponding 9032.26 µm/RIU.

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There has been plenty of interest and investigation in plasmonic metasurfaces to realize high-performance flat optical components and polarization converter devices [1, 2]. Most reported plasmonic metasurfaces are optimized under the realm of highly-radiative lossy electric and magnetic multipoles, which in fact limit their transmission efficiency [3]. As a result, plasmonic metasurfaces seem not very ideal for real applications in particular after introducing their dielectric counterparts. Nonetheless, it has been shown that dielectric metasurfaces cannot interact with the incident light as strongly as plasmonic structures. The requirement of a high aspect ratio in dielectric metasurfaces further devaluates their practical applications [4].
In this talk, I will present two strategies to realize high-performance metasurfaces for real-world applications. First, we draw our attention to modifying the model that is commonly used for designing a plasmonic metasurface for decades. We innovate a strategy to enhance the transmission efficiency of plasmonic metasurface to the highest attainable level [5, 6]. By integrating a solid nano-structure with its inverse complementary, we realized a plasmonic metasurface with a circular cross-polarization conversion efficiency higher than 50% in transmission at near-infrared wavelengths. Such high optical performance metasurface is achieved by simultaneously exciting the electric, magnetic, and toroidal multipolar modes, which satisfies the generalized Kerker condition and improves the transmission efficiency. We further demonstrate a couple of metasurface-based components such as a beam deflector and a flat focusing lens with record operating efficiency based on the proposed metasurface. Second, we switch the research topic from free space components to integrated devices. We propose that the polarization state of a lasing emission can be actively modulated at source with a metasurface-engaged microcavity, including highly circularly polarized, linearly polarized, or elliptically polarized lasing emission [7]. Taking advantage of strong optical feedback produced by the Fabry-Perot optofluidic microcavity, light-meta-atoms interactions will be enlarged, resulting in polarized lasing emission with high purity and controllability. These studies provide innovative insights into fundamental optics and laser physics, opening new possibilities by bridging metasurface into microlasers and practical applications.


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The focal length is invariable for most metalenses once they are fabricated. However, it is useful and cost-saving to realize reconfigurable metalenses for realistic applications, such as scanning microscopy and 3D imaging. Here, we designed an interleaved metasurface for dynamically-tunable metalens which enables continuous focal length tunability in the visible window.

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We experimentally demonstrate a monolithic platform to integrate metasurfaces and silicon photonic waveguides. This platform can generate free-space emission from waveguides and simultaneously control the emission phase and amplitude. We show generation of focused Gaussian beam, Hermite-Gaussian beam, and holographic projection from waveguides to the free space.

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Traditional diffractive or refractive elements need to accumulate phase during propagation, which are bulky and sizeable. Metasurfaces, composed of subwavelength structures, arbitrarily manipulate phase of electromagnetic waves and provide artificial planar optics and replace bulky diffractive elements for effectively manipulating light. In particular, integration of metasurface and semiconductor laser becomes the subject of growing interest in recent year. In this work, we demonstrate a compact meta-hologram PCSELs integration that diffracts ~750 beams to the free space. Such a random beam structured light could be implemented in a variety of optical applications such as facial recognition systems at near infrared.

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A new developed high-power light-source based partially corrugated gratings DFB is proposed here to overcome the challenging issues for the former datacenter network architecture, which suffers from cost production, bandwidth scalability, and power consumption. With HR-AR structure, grating ratio of 0.5, and κLg of 1.25, PCG-DFB can maintain a high output power of 128-mW, high slope efficiency of >0.33 mW/mA, reduced RIN of -155.157 dB/Hz, and good single-mode yield >91.89%. By integrating SOA length of 200-μm, improved output power of 4.64-dB can be achieved by PCG-DFB with length of 300-μm, grating ratio of 0.3, and grating strength of 5000 m-1.

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We report a microcavity laser whose circular polarization can be manipulated at the far field with the four grating waveguides surrounding a microdisk cavity. The lasing properties were characterized, and a high polarization degree of 50% was obtained.

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We demonstrate the active modulation of the ZnO nanowire plasmonic nanolaser on the graphene-insulator-metal (GIM) platform at room temperature. With the gate voltage supported by the GIM structure, the accumulation of the charge concentration in graphene or metal depends on the positive or negative gate bias, changing its intrinsic optical properties and affecting the oscillation of the surface plasmon polariton (SPP) mode. Consequently, the lasing threshold of the ZnO nanowire plasmonic nanolaser can be modulated by applying the gate voltage. When the applied gate voltage was tuned from +6 V to -6V, the threshold power of the ZnO nanowire plasmonic nanolaser with a 7-nm-thick Al2O3 layer increased as high as 6.5-fold, which is a significant change and stands for an extraordinary modulation performance. Additionally, after the repeatability measurement, the ZnO nanowire plasmonic nanolaser also exhibited robustness for gate modulation, which benefits it to realize a stable room-temperature operation. Furthermore, by calculating the turn-on dynamics and small-signal frequency response, the modulation speed of the ZnO nanowire plasmonic nanolaser can reach a few THz regions on the GIM platform. Such high-speed modulation makes the ZnO nanowire plasmonic nanolaser show great potential for integrating the laser and optical modulation in the on-chip plasmonic circuit and improving the operation speed.

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We present normal-incidence GeSn p-i-n short-wave infrared (SWIR) photodetectors monolithically integrated on silicon substrates. By increasing the Sn content to 11%, the photodetection range is extended to 2675 nm at room-temperature to fully cover the entire SWIR range.

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We exploited a series of meticulous approaches including 4f interference measurement to obtain the precise lasing characteristics of perovskite nanolasers and identify the proper resonance mode to establish the scaling law. For the first time, the limitation of optical diffraction in near-field observation for plasmonic nanocavities has been manifested.

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We report on all-group-IV optically-pumped GeSn lasers on silicon for mid-infrared silicon photonics. High-Sn-content GeSn active layer was grown on silicon substrate to realize direct-bandgap. Lasing action was achieved with a lasing wavelength up to 310 nm and temperature up to 200 K.

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Vacuum ultraviolet (VUV) light is essential to practical applications ranging from nanolithography, biosensing, and spectroscopy. However, it is usually challenging to realize efficient and compact VUV devices. In this work, we report a metalens consisting of ZnO nanoantennas for nonlinear light generating and focusing 197-nm VUV light.

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Meta-optics is the subject of growing interest recently; however, some of research are emphasized the efficiency of the metasurfaces itself. Substrate with low refractive materials (e.g., glass) are selected without considering the refractive index matching problem for a compact integration with lasers. To increase efficiency, here, we design our meta-grating as homo-grating, aka same material for the meta-atoms, the substrate, and the top layer of the laser, to avoid mismatch issue. We achieve absolute efficiency more than 50% at a deflection angle ~60°. We envision that our approach can be implemented in various applications, including light detection and ranging (LiDAR).

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Because metasurface is smaller than traditional optical components, many practical applications have begun to appear. Image sensors are an example. Since the lens CMOS sensor cannot distinguish colors, a color filter must be added to distinguish the received colors. However, the efficiency also decreased, so metalens with energy harvesting began to attract attention. This paper introduces metalens with energy harvesting. Through good energy sorting performance, more NIR energy can be collected without affecting the RGB band. If applied to The monitoring system will provide a non-negligible change to the recognition ability at night.

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Metasurfaces, a catalog of optical component, have numerous novel functions on demand. This kind of optical component integrated with vertical cavity surface emitting laser (VCSEL) has been reported. However, the performance is limited by VCSEL features and metasurface designed, such as low output power, large divergence angle. Here, we experimentally demonstrate a holographic image generation from a compact integration of photonics crystal surface emitting laser (PCSEL) and metasurface hologram. This research shows high output power (mW level), free from collection-lens and well image uniformity with wide field of view (FOV), these features are suitable for 3D imaging and 3D sensing.

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We propose plasmonic vortex lens (PVL) 4-arms with circular groove (CG) design to manipulate microparticle in the near field or far field depending on the handedness of circular polarization. The optical properties and trapping performances of the structure are simulated and analyzed. A Polystyrene (PS) bead of 1 diameter can be trapped in the near-field region (0.47λ) under left-handed circular polarization (LCP) illumination with minimum required power of 0.4 mW. Under right-handed circular polarization (RCP) illumination, the particle will be rotated in the far-field region (0.94λ) with minimum required power of 14.9 mW.

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In this paper, we propose an integrated configuration of subwavelength apertures for simultaneous color filtering in a spectral range from the visible to the near-infrared range. The incident light wave coupled with the hybrid nanostructures may result in the surface plasmons propagation through the integrated configuration as a flat lens, generating transmissive and reflective beams with suppressed cross-talk and high spectral resolution. We analyzed the transmission characteristics of the nanostructure color filters by using the finite-different time-domain algorithm. Furthermore, the polarization states and beam propagation direction may be altered with the asymmetric nanostructures in prospective applications.

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Janus metasurfaces provide more functionalities to harness the light with different incident direction as degree of freedom. And directional Janus metasurfaces have been demonstrated at the microwave and near infrared region previously. However, such Janus metasurfaces are designed with multi-layers which cause complex fabrication process. Besides, Janus metasurfaces operating in the optical frequencies play more important role. In this study, we present a design of TiO2 monolayer Janus metasurface which generate different states of orbital angular momentum (OAM) in the visible. Direction-tunable arbitrary vortex beam expands the scope of polarization optics, enables compact and versatile total angular momentum operations.

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The resonant waveguide gratings (RWGs) with in and out couplers have been demonstrated to perform selective color-filtering and beam steering. However, RWGs with forward design suffers lower efficiency that limit the applications. Here, we design a metasurface which composed of titanium dioxide RWGs on the glass substrate working at red, green, and blue wavelengths, simultaneously. And we improve the diffraction efficiency by using adjoint-based topology optimization. The diffraction efficiency of simulation is up to 75% with the Q-factor reaching 320. Such a beam steering device opens a new paradigm for applications, including see-through optical combiners and augmented reality platforms.

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We propose a compact imaging system with optical sectioning capability based on Moiré metalens consisting of two complementary phase metasurfaces to perform fluorescence bio-imaging applications in visible regions. The focal length can be tuned from 10 mm to 125 mm by changing mutual angles between two metasurfaces. In addition, the speckle illumination HiLo microscope is used to reduce the effect of out-of-focus light scattering. The labeled beads as well as ex vivo mice intestine tissue samples are imaged by our system. The presented design of varifocal metalens is anticipated to realize important applications in fluorescence microscopy and endoscopy.

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A facile photoreduction synthesis of Au nanostars by ethanol action is presented for the in-situ sensitive SERS detection of antibiotic residue on chicken meat. The synthesized Au nanostars with sharp tips and clean surface not only can effectively excite strong electric field by lightning rod effect but also increase the number of adsorbed target molecules by avoiding passivation of surfactant. The superior SERS performance of Au nanostars includes high sensitivity, high enhancement factor (2.03×10^9), ultra-low limit of detection (3.41×10^-11 M), superior multiplex detection ability, excellent uniformity and reproducibility (<7.54 %).

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This study reports the preparation of recyclable TiO2/Ag nanoparticles (AgNPs) substrates by using cathodic arc plasma deposition and dc magnetron sputtering technologies.The deposited,TiO2 nano-structure ensured the photocatalytic degradation of analytes.By measuring the Raman spectra of rhodamine 6G (R6G) in titrated concentrations,a limit of detection (LOD) of 10-8 M and a SERS analytical enhancement factor (AEF) of 1.01 × 109 were attained.Self-cleaning was performed via UV irradiation,and recyclability was achieved after at least five cycles of detections and degradations.The proposed TiO2/AgNPs substrates have the potential to serve as eco-friendly SERS enhancers for label-free detection of various chemical and biological substances.

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Recently, we have discovered giant photothermal nonlinearity in the scattering and absorption of crystalline silicon (c-Si) nanostructure. Here we report that under intense laser excitation, the strong thermooptical effects result in the nonlinear dependence of the Raman scattering provided by thermal reconfiguration of resonant response and governed by the Purcell effect. This is the first direct evidence of the Purcell effect contribution over intrinsic Raman emission in all-dielectric Mie resonance nanostructures.

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We numerically analyze the resonance behavior of the nanogratings-based metal-insulator-metal resonator. It is found that resonance appears when the gratings has a lower filling ratio. In addition, there is a red shift for the resonance wavelength when compared with the theoretical value. Finally, the absorption peak becomes stronger when the grating thickness is smaller.

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Spectral tuning on deep gold nanoslit arrays as plasmonic biosensors are presented with simulation based on finite-difference time-domain calculations. By modifying the slit depth, slit width, gold film thickness, and their morphologies, the corresponding transmission spectra and electric fields at resonance wavelengths are discussed based on the mode coupling effects between surface plasmon resonance and cavity resonance. The simulation results are compared with the experimental ones to relate the morphology changes under different fabrication conditions.

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Sixth-generation (6G) network is under development, and requires faster components to meet the high carrier frequencies, ranged between 0.1-3 THz. One of the critical filters in mobile communication is based on the surface acoustic wave (SAW) resonator, with a working-frequency limit about few tens of GHz. In this research, we show a simple 2D-VA heterostructure, composed of few-nm-thick antimonene on bilayer MoS2, provide the acoustic resonator structure to meet this THz-era need. Our photoacoustic spectroscopy study revealed that this 5-nanometer structure form excellent acoustic cavity, generate 106, 332, 550, 772, and 964 GHz resonant frequencies, to drive the sub-THz filters.

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We present the hybrid integration of the side-coupled photonic crystal (PhC) nanobeam (NB) laser to the SiNx waveguide. This hybrid integration realized via a novel transfer printing technique based on the shear force can exhibit displaced and rotational misalignments far below the diffraction limitation than traditional transfer printing based on visual alignment. With modifications by reduced-PhCs and tapered beam to the NB laser, this hybrid integration theoretically shows highly unidirectional coupling efficiency to the SiNx waveguide and an over 10-times laser emission unidirectional coupling to the specific waveguide output than vertical emission to the air in experiments

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In this study, the textures of cholesteric liquid crystals (CLCs) can be transformed from focal conic to planar textures by surface acoustic waves (SAWs). It is an unusual way to change the arrangement of the CLCs. Besides, the duration of SAWs and heat are investigated.

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We theoretically and numerically investigate the chiral charge and current densities of a plasmonic two-wire transmission-line (TWTL) using the quantum theory. Our results reveal the origin of polarization actuated non-reciprocity of a TWTL circulator.



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Plasmonic two-wire transmission line formed purely by monolayer graphene is numerically investigated. We performed analysis on the modal behaviors with Fermi level and operational wavelength as sweeping parameters, indicating the potential for long-range guiding of surface plasmon polaritons.

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In this work, we integrated a periodic seed layer by e-beam lithography and oblique deposition method to fabricate a stochastically-distributed oblique-flat-sheet metamaterial perfect absorber (MPA). Such design could increase its absorption bandwidth and tolerance to high angle-incidence due to the fact that various oblique flat sheets offer different resonance conditions while even a single oblique flat sheet could provide different optical paths for resonance. On the other hand, a seed layer could reduce uncertainty regarding to direct oblique deposition and provide abilities to manipulate the bandwidth of the MPA.

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We studied the pulsed laser-induced plasmonic nanobubbles and the follow-up three types of microbubbles in gold nanorod (GNR) colloidal solution. These nanobubbles are initiated at the beginning of the irradiation, then to trigger the optical breakdown of water at the focal spot of a laser beam. Subsequently, microbubbles are formed with the aid of these nanobubbles. The phenomenon indicates that the exist of GNR significantly reduces the threshold of laser energy to generate microbubbles. We used a He-Ne laser with a photodetector and an ultrasonic transducer to investigate the dynamic formations of nanobubbles and the follow-up microbubble in GNR colloids.

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Two-dimensional 1-T phase VS2 is a potential material to perform as contact electrode with its low work function, low Schottky barrier and metallic properties. Here, we successfully fabricated high quality 1-T phase VS2 with chemical vapor deposition through molten liquid process of Na3VO4 precursors on sapphire substrate via vapor-liquid-solid method. From OM images, AFM images and Raman spectra, VS2 are characterized as the monolayer thin film. Results of electrical measurement shows the VS2 is with the properties of 1-T phase, instead of 2-H phase. With this process, we can fabricate high quality 1-T phase VS2 to apply in 2D hetero-devices

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Previous reports on the generation of isotropic red color by colloidal media are based on limited settings of structural parameters and 2D calculations. In this study, we present the optical characterization for colloidal amorphous media and investigate structural coloration of 3D colloidal structures. Strategies of producing improved red color are discussed, which may facilitate the development of new strategies for generating isotropic red coloration in 3D disorder media.

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Fundamental research on controlling the iridescence of cellulose films by manipulating the alignment and helical pitch of cellulose nanocrystals (CNCs) is required to advance cellulose photonics and develop its optoelectronic applications. Aqueous suspensions of CNCs exhibit a cholesteric liquid crystal (LC) phase with structural color; however, attaining a uniformly colored film is extremely difficult. Nevertheless, we have recognized some strategies for achieving homogeneously colored films. In particular, we have carefully observed that the drying process of aqueous suspensions significantly influences the quality of iridescence of CNC films.

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We introduced a new sulfonate ligand sodium beta-styrenesulfonate (SβSS) with elongated π-conjugation onto CsPbBr3 NCs. The sulfonate ligand can decrease the surface defects of CsPbBr3 NCs and improve photoluminescence quantum yield (PLQY) from 53 to 75% compared with the pristine perovskite NCs. Moreover, the π-conjugation of the ligand enhances the charge injection and transport capability into NCs cores. The optimized green PeLED based on the SβSS-modified CsPbBr3 NCs exhibited a maximum brightness of 10965 cd m-2 and a maximum current efficiency of 10.9 cd A-1, revealing 2.5- and 2.4-fold enhancement compared with the device based on the pristine NCs.

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We synthesize perovskite quantum dots (PeQDs) having a high photoluminescence quantum yield (PLQY = 98%) for light-emitting applications. We blend the PeQDs with polyvinylcinnamate to formulate photopatternable thin films. The resulting perovskite quantum dot–polymer nanocomposites (PQD-PNCs) can be patterned using UV light to provide feature sizes as small as 3.86 μm. The highest PLQY of the PQD-PNC film (47%) is greater than that of the neat QD film (40%). The results suggest the high potential of PQD-PNCs as effective color-conversion layers for future micro-LEDs.

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Recently, all dielectric metasurface exhibits a ultranarrow band resonant spectrum, called bound states in the continuum (BIC) is frequently utilized for biosensing applications. Due to its the specific resonance, all-dielectric metasurface can be highly sensitive in the refractive index changed by the surround medium. A TiO2 nanohole metasurface excited by 650 nm light source reaches the sensitivity of 276.67 nm/RIU by COMSOL simulation is presented in this work and provide a promising way to design high sensitivity biosensors.

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The excitons of a monolayer (ML) TMDC suspended in air are decreased screen effect by from the substrate dielectric, resulting the enhancement of photon emission. .In the study, we demonstrated the lasing action of suspended ML tungsten diselenide (WSe2) on a microdisk peripherally surrounded by an air gap. In absence of substrates, the photoluminescence of suspended ML WSe2 was enhanced by five folds. With ML WSe2 on the microdisk with an air gap, the device showed a lower lasing threshold and better performance than those corresponding to a generic microdisk covered by the 2D material.

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In this study, electrochromic devices with high optical modulation were fabricated by depositing amorphous WO3 nanostructures on ITO glass using potentiostatic electrodeposition. The increase of Na2WO4·2H2O concentration promoted the deposition of WO3. However, a thicker WO3 film decreased transmittance and declined the electrochromic characteristics. An optimal optical modulation of 77.7% was obtained using 25 mM of Na2WO4·2H2O. The embedded charge was 0.02749 C/cm2, and the coloration efficiency reached 49.2 cm2/C. The coloration and bleaching times were 5.3 and 5.2 s, respectively. The electrochromic device exhibited high optical modulation and a fast switching performance.

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The power conversion efficiency of a Si-based solar cell is improved by changing the materials and the cell structures. Our research findings show that the nanorod solar cells with the n-type omega(Ω)-shaped concentration doping have better performance than those doped with full-area, where ITO is used as the top electrode and silicon dioxide is filled between the nanorod structures. Both optical and electric properties are simulated based on Lumerical software with FDTD and CHARGE solvers.

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The magnesium oxide is one of the promising candidate’s materials that can act as solar blind photodetectors. However, the intrinsically low thermal conductivity of MgO,which is restrict the application in electric device. The magnesium oxide exhibits the poor conductivity which could improved by doing method. This paper fabricated magnesium indium oxide (MgInO) solar-blind photodetectors by MgInO film was deposited on glass substrate by co-sputtering using MgO and In2O3 targets with different oxygen flow.


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Zinc oxide (ZnO) materials are widely used in gas sensing. This study performed deposition of aluminum-doped ZnO (AZO) nanofilms through radiofrequency magnetron sputtering. Oxygen flux and power during sputtering were altered to adjust the films’ surface morphology, produce a highly porous structure, and increase sensitivity to carbon monoxide. The results demonstrate that an oxygen flux of 10 sccm and sputtering power of 175 W produced films with favorable surface morphology and increased the maximum CO response value. Thus, the surface structure of the films can be adjusted by optimizing sputtering parameters, which increases sensitivity to CO gas reactions.

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The methylammonium lead bromide perovskite (MAPbBr3)-embedded nanofibers were fabricated by the uniaxial electrospinning technique. Through the differences of solidification properties and immiscibility between perovskite precursor, polymethyl methacrylate (PMMA) and Polyacrylonitrile (PAN), the perovskite nanoparticles mainly are concentrated in the core area, also, the PMMA and PAN provide a smooth surface and waterproof environment, benefiting the lasing behavior happened. Further, we observed its photoluminescence performance. The single-mode lasing action was successfully achieved from single nanofiber.

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Photo-induced negative differential resistance (NDR) accompanied with resistive switching based on glutamine-functionalized MoS2 quantum dots has been demonstrated. By increasing the illuminated light power on the Au/MoS2-quantum-dot/Au structure, the NDR effect can be enhanced significantly. The light-induced NDR originated from the tunneling transport and carrier trapping of the interface states between MoS2 quantum dots and Au. By changing the illuminated light intensity, multi-level resistive switching can be realized, which provides potential applications in multi-level memory devices.

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In this work, we propose a cost-effective strategy to construct an ultraviolet (UV) light heterostructure photodetector via spin coating FAPbI3 nanoparticles on a monolayer graphene film, which has an outstanding detection of UV light. The heterostructure photodetector exhibits a responsivity of 4.5 A/W and detectivity of 6.79×109 Jones at an incident power of 199 mW under 365 nm illumination. This high performance can be attributed to the combination of the strong light absorption of the perovskite material and the high mobility graphene, leading to a high exciton ability and photocurrent under UV light illumination.

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In this study, a NiO buffer layer was prepared to improve the electroluminescence (EL) of organic light-emitting diodes (OLEDs), where the OLED structure was ITO/NiO/NPB/Alq3/Bphen/LiF/Al. The insertion of an ultrathin NiO buffer layer enhanced the injection of holes. Consequently, carrier balance in the luminescent layer was achieved, and the OLED efficiency was improved. EL measurements showed that when a 1-nm-thick NiO was inserted, the luminous intensity and current density of the OLEDs were increased by 33.2% and 10.9%, respectively. The power efficiency increased by 27.5%, and the external quantum efficiency increased by 21.1%.

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In this study, an additive of micron-sized ceramic powder was used to enhance the mechanical properties of 3D printing resin. It was observed that adding an appropriate proportion of micron-sized ceramic powder could improve the tensile strength of the polymer resin. It is expected that the temporal bone surgery simulator printed with the synthesized composite resin would be able to solve the problem of expensive costs in surgical training.

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In this study, there are two objectives had been done. The first involved the fabrication of a white light emitting diode (LED) with a high color rendering index (CRI) through the near-ultraviolet excitation of phosphors, and the phosphor ratios were adjusted to obtain a color temperature of 2800 K. Then due to this LED had relatively low brightness, the second objective entailed the addition of gold nanoparticles at various concentrations to enhance light reflection within the LED, thereby improving the light output. A white LED with a high CRI and a high light intensity was successfully developed.

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We propose a design for a millimeter-scale 2D free-space beam emitter, which converts the subwavelength mode size of a silicon waveguide to a millimeter-scale Gaussian beam. The beam emitter consists of two stages of engineered coupling. The first stage relies on the coupling between a strip waveguide and a slab waveguide, and the second stage uses a meta-grating to couple the slab waveguide mode to the free space. The semi-analytical design is verified with the finite-difference time-domain (FDTD) simulation.

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This paper uses pulsed laser deposition to grow copper oxide films on C-surface sapphire substrates with a laser wavelength of 266 nm, a pulse width of <10 ns, and a pulse frequency of 10 Hz, and studies the effects on the growth of copper oxide films by changing the substrate temperature, deposition time, gas type, and background gas pressure. The photocatalytic properties were also studied. The photocatalytic effect was analyzed by measuring the crystal structure by X-ray diffraction spectroscopy (XRD) and the penetration spectrum by UV-VIS spectroscopy, and then the samples were put into methylene blue solution for photocatalytic experiments.

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The strong electron-phonon interaction in 2D perovskites would lead to the formation of trap states. The electron-hole pairs or free excitons may be trapped by these trap states and affect the optical and electrical performance. According to photoluminescence measurements, we found that the recombination processes were governed by a free exciton channel as well as two self-trapped exciton channels. Furthermore, the transition rates between each state can be understood by time-resolved photoluminescence measurement and numerical fitting of the rate equations.

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We use inorganic perovskite CsPbBr3 nanocrystals coated on SiO2 microspheres, with the excellent luminescence properties of CsPbBr3 nanocrystals as an excellent optical gain medium, as well as the excellent geometric properties of spherical cavities to provide light to generate total reflection and reduce energy loss. At room temperature, the whispering-gallery mode was observed.

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Non-volatile memory will play a significant role in the progress of the next-generation of electronic products. In this paper,switching properties of Al/MgO/ITO/Glass resistive random access memory device were successfully demonstrated. Conduction mechanisms were investigated from current-voltage (I–V) graphs of RRAM devices, Under different metal oxide film thicknesses, the measurement results show different distributions of resistance values, among which the device with MgO thickness of 20 nm is the most stable probability distribution.

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In this study, we investigated the change of optical reflectance of the samples with nano-size phosphors layer on the silicon substrate with Al2O3 (80 nm) by dip coating silicate solution with different phosphors concentrations (3, 5 wt%). To achieve a uniform distribution of phosphors on the samples, we also study the surface of Al2O3 layer with and without hydrophilic process under UV light illumination before dip coating.

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Uncontrolled generation of free radicals in the human body leads to oxidative stress-related disorders. Total antioxidant capacity evaluation in body fluids represents an important biomarker of oxidative stress. Herein, we prepared fluorescent AuNCs stabilized by BSA and explored its photo-responsive oxidase-mimetic ability to detect antioxidants in human saliva and cancer cell lines. Upon visible light irradiation BSA-AuNCs generated free radicals which oxidized non-fluorescent thiamine to fluorescent thiochrome but in the presence of antioxidants, fluorescence quenching was observed. Finally, a portable microfluidic sensor was developed for onsite evaluation of antioxidants from human saliva.

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In the study, we propose a fabrication strategy to construct low-resistivity amorphous carbon/Cu hybrid electrodes for advanced applications of next-generation devices. Amorphous carbon is deposited using atmospheric pressure chemical vapor deposition (APCVD) at a low temperature of 400℃. It is demonstrated that the resistance of amorphous carbon/Cu hybrid electrodes is 2.139 (Ω/m2), which is better than that of the pure copper 3.38 (Ω/m2).

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We integrated our self-designed and fabricated THz Large Area transceiver with the hyperspectral system. To demonstrate the results, we observed a spot size of approximately 4 mm and a broadband image of 0.4 to 1.0 THz by using the knife edge method. Our setup can resolve patterns of different sizes at better than 5mm resolution, and in collaboration with the ChiMei Museum, we have scanned images with excellent resolution, which has great potential for real-time terahertz hyperspectral microscopy applications in artwork conservation.

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We report on 2µm wavelength band operating GeSn waveguide light emitting diode. Room temperature electroluminescence in the 2µm operating region is clearly demonstrated. These results open the avenue for integration of proposed GeSn LED with other photonics devices to realize full integrated Si photonics chip.

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Metasurface grating, as known as metagrating, promote the efficiency of diffraction optics by ultrathin and subwavelength building block. However, forward design finds the limitation to optimize maximum efficiency with the best sets of nanopillars. In this study, we numerically demonstrate a metagrating which effectively deflects the light to the 1st order diffraction by using inverse design and gradient-based optimization method. The maximum efficiency of our metagrating achieves up to 81%. With some iterations, the efficiency can be optimized to a high value without pre-build phase library of meta-atom. This framework can be extended to design high efficiency multifunctionality metasurface.

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Nanoimprint lithography is a method of fabricating nanoscale patterns. Imprint resists are typically monomeric or polymeric formulations that are cured by heat or UV light during the imprinting process. In this paper, we demonstrated nanoimprint lithography in geometric phase metalens. A simpler and more compact design was achieved by using the NIL equipment, the photoresist with 100 nm critical dimension metalens pattern was imprinted on the substrate by hot embossing and UV nanoimprint, respectively. Finally, we transfer metalens pattern with 1.515 refractive index on the silica substrate and then measure the distance of focus point.

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We analyzed the composition of two-dimensional layered halide perovskites. Under different annealing and solvent conditions, crystals with different morphologies will be produced, and dimethylformamide(DMF) has better film-forming properties. By internally doping methylamine cations, we observed a red-shift and emission of multiple wavelengths in photoluminescence spectra with increasing doping ratio. In X-ray diffraction spectra, the shift of the diffraction peak shows that it is not a single pure phase perovskite.

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In this study, the light–matter interaction between graphene and surface plasmon polaritons (SPP) was investigated. For realizing improved integration in nanocircuits, single-layer graphene was added to asymmetric SPP nanoantenna arrays for nonscattering detection in the near field. The developed device is capable of detecting the controlled propagation of SPPs with a photoresponsivity of 15 mA/W, which paves the way for new-generation on-chip optical communication.

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In this study, we demonstrate large area and high efficiency near-infrared (NIR) metalenses with a diameter of 1.5mm and NA 0.45 in the 1550nm operating wavelength using i-line photolithography procedure with model based Optical Proximity Correction (OPC) and Rule-based model. The lithography model for photoresist image simulation consists of Hopkin’s partially coherent image formation and fully convolutional network(FCN). We produce 64% efficiency metalenses with model based OPC, and we also have realized 51% efficiency a diameter of 8mm metalenses with rule-based model. In conclusion, we introduce deep learning model and rule model to decrease the time and money expense.

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InGaN-based resonant-cavity light-emitting membranes (RC-LEM) had been
demonstrated by separating from the μ-GaN/sapphire substrate. Porous GaN distributed Bragg
reflectors and membrane separated process have been fabricated through the two-step
electrochemical etching processes. The vertical-type EL emission spectra of the μ-RC-LEM
were measured on the conductive ITO/glass substrate. By tuning the cavity length on ITO
layer, the cavity-mode emission spectra of the μ-RC-LEM structure has been observed clearly
at 455nm with narrow emission line-width property.

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We design the achromatic metalens, the light-enhanced structure of perovskite and piezoelectric energy harvester by using the gradient-based topology optimization. These work demonstrate that topology optimization as inverse design tool can get better result and faster design than the conventional way.

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In this work, we try to improve the contrast of surface plasmon resonance image (SPRi) and detection limit .Before experiment we use FDTD of lumerical software to simulate and make sure contrast of SPRi will improve. In the experiment use color CCD and filter that have the center wavelength close to the SPR mode peak and dip to increase the image contrast. Finally,transmit type γ slope is four times better than those without filter and detection limit decrease one order.

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In this study, we utilize the metal stress-driven self-folding method to design and fabricate flower-shaped vertical metamaterials that work as perfect absorber and emitter structures. The advantage of the metal stress-driven self-folding method is that a stereoscopic structure can be formed directly from a planar pattern without multiple and complicated exposure steps. In our result, we can demonstrate the flower-shaped metamaterials perfect absorber with over 97% absorbance. The perfect absorber and perfect emitter with high directivity at different temperatures are performed and show great potential in IR molecule sensing, tunable IR light source, and IR color routing.

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The intrinsic spin-valleys in monolayer transition metal dichalcogenides (TMDCs), making them be promising candidates for developing next-generation valleytronic and spintronic quantum devices. Recently, hexagonal WS2 (h-WS2) with triangular heterogeneous defect domains show the promising results in valley polarized emission at room temperature. In this work, we proposed two different types of monolayer WS2¬ both shows great selectively valley-polarized photoluminescence (PL) by combining with plasmonic-nanostructures. Chiral plasmonic –nanostructure has circular polarized dependence, when combining with h-WS2, the device can strongly enhance the circular polarized selective of PL.

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The PT-symmetry single-mode lasers are successfully implemented by the laterally coupled double microdisk lasers of InGaAs quantum dots. Under single selective pumping (gain-loss contrast) at room temperature, the laterally coupled double microdisk lasers of d = 150nm, and 200nm show single lasing mode at WGM m = 1,21 (wavelength= 1199nm).

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The spectral characteristics of chiral nematics (N*) with the Helfrich deformation is investigated, which differ from those of the common N*. The leading cause of this phenomenon is verified by the Berreman 4 × 4 matrix simulation, and which is concluded to be similar to the waveguide effect due to such structures. Besides, the bandwidth variations between transmissive and reflective spectra are deduced to be caused by the phenomenon of lights reflected back and forth between the middle and edge layers.

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In this study, the continuously tunable linear-polarization rotators are fabricated by cholesteric liquid crystals (CLCs) having a non-integer periodic structure in space by the wedge-shaped LC cell. With the characteristics of CLCs, a continuously linear-polarization rotation can be obtained at different position of the CLC cell.

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The near infrared (NIR) random laser has been demonstrate by adopting LDS 722 organic dye as a gain medium on top of
biocompatible silk fibroin (SF) films. As pump energy increases, the multiple emission spikes were excited owing to the recurrent light scattering between laser dye and SF film to form coherent feedback. Under the different excited location, we demonstrated that the highest emission spike at 709.5 nm can be excited with lower threshold around 0.84 µJ.

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In this study, the performance enhancement of single-junction GaAs solar cell was demonstrated using indium nanoparticles (In-NPs) embedded in SiO2 anti-reflective layer. The dependence of distance between the In-NPs sheet and the surface of single-junction solar cell resulted in plasmonic effect on the weighted average of reflectance (RW), external quantum efficiency (EQE), and conversion efficiency (η) were investigated. The obtained results showed that the In-NPs sheet embedded in SiO2 and 12 nm away from the surface of solar cell had the highest conversion efficiency enhancement of 21.17% due to near-field plasmonic effect.

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Robust slow-light and topological edge-states have attracted more attention due to their high potential applications for nonlinear optics, enhanced light-matter interaction and optical computing. This study finds that the robust slow-light of 26.57 m/s group velocity is achieved in a conjugated topological photonic crystal.

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In this study, we present amorphous trivalent networks generated by bond swapping, yielding unique geometrical properties that haven’t been reported previously. The structures exhibit low levels of orderness, indicated by measures of local similarity and ring distribution, yet a photonic band gap (PBG) can still be observed. Our results provide new strategies for the design of PBG materials and may also facilitate the understanding toward the origin of PBG in disorder media.

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We demonstrate a tunable ferroelectric lithography plasmon-enhanced substrate to generate photo-reduced silver nanoparticles (AgNPs) and achieve enhanced photoluminescence (PL) with a shortened lifetime of DCJTB depending on the substrate’s annealing time. The enhanced PL can attribute to the localized electromagnetic (EM) wave produced by the nanotextured AgNPs layers' surface and gap plasmon resonances. The remarkable enhanced PL of DCJTB can attain in the fabricated periodically proton exchanged (PPE) lithium niobate (LiNbO3) substrate. Compared with the un-annealed substrate, the PL intensity of DCJTB in the assembly metallic nanostructures is enhanced 13.70 times, and the PL’s lifetime is reduced by 12.50%, respectively.

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The random lasing characteristic from irregular alignment of all-inorganic CsPbBr3 QDs film on rose pedal replica silk fibroin (RPR-SF) film has been investigated through the pump of Q-switched laser. Here, the nanostructure on SF film was produced by the soft-lithography from rose pedal. In comparison to the CsPbBr3 QDs film on SF film, the threshold of RL is reduce from 5.04 to 1.75 μJ and the slope efficiency is increase with the assistance of nano-structured SF film. It is attributed to the enhancement of recurrent light scattering between QDs and SF film to increase the photon confinement.

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The pristine and F4TCNQ-doped copper thiocyanate (CuSCN) films were utilized as the HIL for the fabrication of quantum dot light-emitting diodes (QLEDs). The F4TCNQ-doped CuSCN film has a smoother surface and higher hole mobility compared to the pristine one. The best QLED was achieved with 0.02 wt% F4TCNQ-doped CuSCN film, revealing a low turn-on voltage of 3.6 V, a current efficiency of 35.1 cd A−1, and a maximum brightness of 169,230 cd m−2.

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ZnCo2O4 nanoparticles (NPs) were prepared by a chemical precipitation method as the HTL in inverted perovskite solar cells (PSCs). The compact and smooth surface of the ZnCo2O4 NPs layer helped to grow pinhole-free perovskite film with larger grain size compare to the PEDOT:PSS film. The inverted PSCs based on the ZnCo2O4 NPs layer sustained 85% of its initial efficiency after 240 hr continuous exposure under 1000 W/m2 halogen lamp matrix, whereas the efficiency of the device based on PEDOT:PSS dropped to only 0.5% of its initial efficiency after 144 hr storage.

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In this work, we study the topological valley edge states at the interface between two photonic
crystals (PhCs) [1,2] of dielectric cylinders arranged at honeycomb lattices [3-5]. For three materials, the
dispersion relations for the valley edge states are calculated by using the plane wave expansion method with
properly chosen supercells, and the time-dependent propagating behaviors of the these edge states are simulated
with the Finite-Difference-Time-Domain (FDTD) method.

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In this study, the effects of V/III ratio during the epitaxy growth of InAs quantum dots within the InGaAs/InAs/InGaAs dots-in-a-well structure was investigated to improve the dot size uniformity, dot density, and optical properties of InAs quantum dots (QDs). The results of the study found that a lower V/III ratio can improve the growth quality of quantum dots with reduced coalescent dots

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By applying a parametrization to one-dimensional PT-symmetry transfer matrix as well as a consideration of the non-imaginary value of the Bloch phase, we display the formation of coherent perfect absorption-lasing (CPAL) and bidirectional transparency occurred at a finite periodic waveguide network composed of unit cells having a parity-time (PT) symmetry. The results goes beyond any operating frequency, system configurations, and materials. By embedding a proper number of unit cells and operating at specific phases, the finite periodic systems can exhibit anomalous wave scattering entirely different to that of its unit cell.

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We made a grating structure with the guided-mode resonance (GMR) and subwavelength periodic structure characteristics so that it has broadband features and high reflectivity. Because of the Fabry-Perot resonance and leaky Bloch mode interference, we change the thickness of the sublayer to generate a transmission filter.

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Quantum spin Hall effect with one-way propagating topological edge states without adding magnetic fields and breaking the time-reversal symmetry has inspired photonics topological insulator research. We use finite-difference time-domain method to study the one-way propagation Pseudospin edge states at the interface in plasmonic topological insulators and study its topological Chern numbers by Wilson loop approach.

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We developed a three-stage method to prepare NiOx nanoflakes as the hole transport layer
(HTL) in the inverted perovskite solar cells (PSCs). The deposited perovskite films on NiOx
nanoflakes with larger grain sizes and fewer boundaries were obtained, implying higher
photogenerated current and fill factors in our PSCs compared to the NiOx thin film. The optimized
PSC based on the NiOx nanoflakes showed the highest efficiency of 14.21% and little hysteresis,
which outperformed the NiOx thin film as the HTL. Furthermore, the device maintained 83% of its
initial efficiency after 60 days storage.

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In this research, a refractive index sensing based on quasi-bound states in the continuum (Q-BIC) at visible wavelength was demonstrated. Via internal excitation, Q-BIC can lase at the resonance wavelength, and the FWHM can much smaller than the reflectance resonance peak; thus, the FoM can be extensively improved. This Q-BIC sensing structure achieves a sensitivity of 191.91 nm/RIU and FoM is 611.47 on experiment.

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High-quality one-dimensional ZnO nanorods (NRs) were successfully manufactured via the low-cost hydrothermal method. FE-SEM, HR-TEM, and XRD patterns of the hydrothermally as-grown NR arrays exhibited the hexagonal wurtzite structure with a single crystal property and preferentially oriented along the c-axis direction. The ZnO photodetectors (PDs) with and without adsorbed Ag NPs were labeled Ag@ZO-1 and Ag@ZO-0 NR arrays, respectively. The dark currents (Idark) of Ag@ZO-0 and Ag@ZO-1 PDs were 4.9 × 10−8 and 7.0 × 10−9 A, with photocurrents (Iph) under UV illumination of 1.30 × 10−6 and 1.34 × 10−5 A, respectively at 1 V.

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In this work, zero-dimensional corner states of voltage distribution on two-dimensional electric circuits are studied. Since the circuits contain not only capacitors and inductors, but also resistors, the dynamics of the circuit systems are non-Hermitian. In addition, since the dimension of a corner state is lower than the dimension of the system by 2, the topological corner states are characterized as the second-order topological states.


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We investigated the exciton-phonon interaction of FAPbI3 QDs films under photoluminescence (PL) measurement through precisely temperature control. As temperature increases from 78 to 300 K, the blue shift of emission photon energy around 20.2 meV and phase transition of FAPbI3 QDs film have been observed. Through well-fitting of intensity and FWHM as a function of temperature by the Arrhenius equation and Bose−Einstein statistics, the relatively high binding energy Eb around 82.2 meV and LO phonon energy Eph around 121.0 eV have also been derived.

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We experimentally demonstrate titanium nitride (TiN) broadband metasurface perfect absorbers by conformally coating plasmonic TiN films onto disordered anodic aluminum oxide (AAO) nanotemplates. The disordered metasurface absorbers exhibit polarization-insensitive and weak angle-dependent perfect absorption over the entire visible and near-infrared spectral regions.

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Preparing the efficient as well as the earth-abundant metal electrocatalysts is important in water-splitting practices to understand renewable energy systems. Suffered from photocorrosion, the performance of indium gallium nitride (InGaN) based photoelectrode degrades while in the process of water-splitting. This study mainly discusses the method to enhance the durability of InGaN in photoelectrochemical (PEC) systems by decorating Ni(OH)2. Typically, Ni(OH)2 is a good catalyst, thus the addition of such catalysts can enhance the transference at the interface between the photoelectrode and the electrolyte.

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In this study, the MgZnO MSM UV PDs grown by RF sputter on sapphire, quartz, and ZnO substrates were fabricated and investigated. The MgZnO thin films annealed at 700 °C have the best photo-to-dark current ratio due to the optimal film grains size and density. These three PDs simultaneously show an obvious persistent photoconductivity effect, especially for the MgZnO thin film on quartz substrate. In addition, the MgZnO thin film on ZnO substrate accomplishes a better time response due to fewer oxygen vacancies and better film quality.

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Plasmon thin film transistors of Al/Hf co-doped ZnO nanolayer channel are deposited on ITO substrates by atomic layer deposition. Au nanoparticles are formed on the top surface of channel layer of thin film transistor by rapid thermal process of 5nm gold thin film. In addition to the photocurrent gain IDS = 6.6x10-5 A under UV light ( 350nm) by ZnO bandgap absorption, green light( 550nm) absorption of IDS = 1.6x10-5 A by LSPR is observed at VGS = 10V and VDS = 30V.

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This study is to fabricate indium gallium zinc oxide(IGZO) thin film transistors(TFTs) on glass substrates. The experiment is divided into two parts.
The first part of the experiment is the deposition of IGZO, and the use of X-ray diffractometer, surface profiler(Alpha-step measurement), UV-visible light spectrometer, ellipsometer, Hall effect measurement to detect and analyze material properties under different argon and oxygen ratios to find the best sputtering conditions.
The second part is to fabricate IGZO TFTs with SiO2 single insulating layer and SiO2/HfO2 double insulating layer with thicknesses of 170/30nm, 180/20nm and 190/10nm, respectively. Use semiconductor parameter analyzer to measure device characteristics.


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In this study, the Gallium-doped ZnO thin film had been deposited by RF sputtering and was used as the material for the touch sensor. After the analysis of various loading test, the structure had been deposited as PC/100 nm GZO with nitrogen/200 nm GZO under the condition of IN=1, IT=7.5 min, and that the nitrogen flux is 1.5 sccm, the thin film has the highest resistance change rate(sensitivity) as 36.54%, and the difference of sensitivity under various loading decrease to 12.14%, which confirm the designed GZO thin film has potentially to apply on touch sensor.

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In this study, we have used molecular beam epitaxy to grow the Type-II super lattice structure. By changing the temperature and increasing the periods, we studied structural and optical properties to determine the epitaxial quality of the surface. X-ray diffraction pattern shows that the sample A had a lower rocking curve full width half maximum (FWHM) of 15.1 sec. Low temperature PL was studied for the sample and the spectrum revealed an intensity of 320 μV at wavelength of 2660 nm.

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We demonstrated a photo-induced reaction to increase the deposition density of Au-nanoparticles on the cellulose substrate. It performed about 5-10 times amplification when compared with light-free preparation group at 633, 785, and 1064 nm. The adenine, thymine, cytosine, guanine, and xanthine were detectable to be nanomolar concentration regions with the designed SERS substrate. In addition, we found a strong and oriented adsorption property for adenine which could be developed to sense a low-concentration of bacteria-related metabolite (i.e., adenine and xanthine). The SERS signals of the release of adenine and xanthine molecules from the 100-102 CFU/mL was responsive within 6 hrs.

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In this work, we demonstrated a THz detector of phosphorus doped GeSn photoconductor. The fabrication process of GeSn is low cost and CMOS compatible therefore it fulfills mass production. This result shows that GeSn can be developed in Terahertz science and technology.

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We develop a one-pot redox reaction to fabricate concave double-shell AgAu (CD-AgAu) and CD-AgAu:Pd nanocubes. Due to high-surface-area from the double-shell structures of the 2.8%Pd-doped CD-AgAu nanocubes, they demonstrate catalysis reaction for the complete conversion of nitrothiophenol at ≤30 s. Similarly, CD-AgAu:2.8%Pd nanocubes showed excellent GOR efficiency. The results of electrochemical measurements indicate that the CD-AgAu: 2.8%Pd nanocubes enhance the catalytic efficiency of 4-NTP. Besides, CD-AgAu:Pd nanocubes possess concave structures that exhibit superior surface-enhanced Raman scattering (SERS). Thus, CD-AgAu and CD-AgAu:2.8%Pd nanocubes could be used to sense the primary cellular metabolites which was response to toxic molecule because apoptosis happened.

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Surface acoustic wave (SAW) on a localized surface plasmon (LSP) is been studied experimentally and theoretically to unveil the properties of plasmon-phonon interaction in photonics device applications. An X-cut LiNbO3 substrate had been used to deposit Au nanoparticles, and an inter-digital transducer (IDT) was fabricated to create SAW pulses. Different plasmon dynamics and the relaxation gradient are impacted by the interaction between amplitude-varying mechanical waves and plasmonic oscillation, which results in a consistent shift in LSP absorption, has been covered extensively in this study

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Abstract: This study presents a gelator-doped liquid crystal (LC) scattering device with dual-operation modes that is the bistable mode and the dynamic mode. The LC scattering device is transparent at the null voltage and are scattering with the applied voltage of 5 V. The transmittance of light can be controlled electrically in the dynamic mode. In the bistable mode, the free-field scattering and transparent can be obtained through a voltage pulse of 10 V and the temperature control. The gelator-doped LC film can save energy more efficiently and can be be used in see-through display and smart-window applications.

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