Session Index

Digital immunoassays with multiplexed capacity, high sensitivity, and high-throughput operation are urgently required in biomedical diagnosis, food safety and environmental monitoring. We developed gold nanostructures-based nanoplasmonic imaging method and applied it for digital immune analysis. Compared to current digital immunoassays that need fluorescent labeling and second antibody, the proposed nanoplasmonic imaging technology (NIT) can identify surface binding effect on single gold nanoparticle without any further labeling and reporting antibody. In this talk, the NIT method will be introduced and compared with other detection methods. The NIT will be used for detecting LSPR signals of gold nanoparticles and counted the antibody-antigen interactions for each single nanoparticles. The digital detections enhance the detection limit from ug/mL to pg/mL. It also takes advantages in the real application of complicated medium. Examples of detecting the spike protein of Covid-19 in salvia and pesticides in real samples will be presented

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In this work, we have used finite difference time domain (FDTD) simulation to study the crosstalk behavior with the shape of deep trench isolation (DTI) of pixels arranged in a Bayer pattern. For blue illumination (λ=400 nm), the sum of optical and spectral crosstalk is lower for DTIs with values of Wratio > 1; whereas higher for green illumination (λ=550 nm). The increase in electrical crosstalk with higher Wratio values for blue illumination (λ=400 nm) is because of the higher generation of electron-hole pairs (EHPs) deep inside silicon (Si).

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We proposed silicon core based photonics crystal fiber and applied on NH3 gas sensing. Au/graphene coating surrounding the air holes acted as a plasmonic active metal, and an average sensitivity was 0.0295 nm/ppm was obtained.

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The frequency-resolved optical gating (FROG) is a powerful technique to analyze the optical dispersion in ultrafast laser. In this paper, we studied the fast optical dispersion estimation method based on deep neural network (DNN). The DNN-based dispersion estimation not only directly determine the group delay dispersion (GDD) from a single spectrogram, but also the computation time can achieve 4 times faster than standard principal component generalized projection algorithm (PCGPA). Different embedded computation platforms including Jetson Nano (GPU) and FPGA are discussed. And the FPGA shows the ability for integration with a real time applications.

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A new liquid-level optical fiber sensor based on Michelson interferometer (MI) is proposed and demonstrated. The sensor is formed by splicing a pencil-shaped single-mode fiber with another single-mode fiber. The experimental results show that very high liquid-level sensing sensitivity of -41.4 pm/mm can be realized. We have also discussed its temperature properties.

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Deep learning has been recently applied to adaptive optics, makes it possible to quickly correct optical aberrations. Furthermore, the Shack-Hartmann wavefront sensor (SHWS) is an essential tool for wavefront sensing in adaptive optics system. In our research, we propose a deep learning method to reconstruct the wavefront, we integrate U-Net with SHWS. This approach is not only directly inferred the exact phase information from the images received by SHWS, but also the intensity of beam profile. Moreover, compared to the traditional method using of center of weight algorithm, the U-Net significantly reduces the time to compute the wavefront and intensity.

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This study firstly explores how to fabricate micro-polymer probes on the end section of graded index multimode fiber (core diameter of 62.5 μm) using UV lithography process technology. We have successfully fabricated various miniature polymer probes, and used the change of the interference ring separation of the output diffracted light after passing through solutions of different concentrations (refractive indices) to sense the change of the refractive index of the liquid.

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We proposed a photon trapping in silicon by plasmonic diffraction and reflection within image sensor pixel to improve the near-infrared sensitivity. The plasmonic grating on the top surface of the sensor diffracted at a large diffraction angle nearly 90°, which increased the effective propagation length at the finite silicon thickness and improved the silicon absorption. The effective propagation length in silicon was increased by repetition reflection of the diffracted light between the metal trenches. In simulation, the silicon absorption was enhanced 8.2 times at a wavelength of 940 nm with 3-µm-thick.

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This study explores how to apply the cross-sectional reflective images of multimode optical fiber (core diameter of 50 microns) to liquid level sensing. We have successfully demonstrated that this experimental architecture is feasible, but the measurement range of the liquid level is only tens of microns and the measurement could be affected by the surface tension between the liquid and the optical fiber. So there is still room for improvement from practical industrial applications.

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Our demonstrated APD with triple multiplication-layers and tailored charge doping design which exhibits low Vpt and an invariant Vbr, reducing space-charge screening and device heating. High saturation-current (12.8mA) and high-quality 4-D images in FWCW lidar system are achieved using this device.

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A single-pixel camera is constructed to recording 4-um thermal image. With this particular wavelength range, the thermal images of LEDs with silicone rubber encapsulation were recorded and reconstructed successfully using compressive sensing algorithm.

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We demonstrate a new method to fabricate an open-cavity Fabry-Pérot interferometer (FPI) sensor with a hole. The FPI sensor was formed by splicing an annularly polished single-mode fiber (SMF) with a section of hollow-core fiber (HCF). By applying a force on the SMF, a film will be left on the fiber end with a hole. By varying the pressure difference, we can obtain the pressure sensing sensitivity is 27.2pm/psi. Besides, the sensor can resist the disturbance from the variation of temperature.

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To enhance the accuracy of the under-screen fingerprint technology, we found it helpful to add an aperture and microlens. In this paper, we will describe the importance of these structures for under-screen fingerprint technology.

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In this work, the UVLED structures with multi-quantum wells (MQWs) were studied to calculate the physical and optical properties by SiLENse (Simulator of Light Emitters based on Nitride Semiconductors) software. The several structures of ultraviolet light-emitting diodes (UVLEDs) with their emission range from 250nm to 380nm were studied. The output parameters of their structures are included: band diagram, emission spectra, current-voltage (I-V) characteristic, Internal Quantum Efficiency,... The dependence of the emission wavelength to the structural parameter of uvled (as Al component in AlxInyGa1-xN layer, layer thickness and the number of MQWs, doping concentration, thickness of the layers buffer /barrier…) were determined.

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An ultra-precise liquid level sensor based on tapered fiber Bragg grating is proposed with the sensitivity of 7.1dB/mm to have the ability to monitor the tens micro-meters liquid-level variation.

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In this work, we present a highly sensitive label-free optical sensor based on a hybrid mode of high order Tamm state of Bragg photonic structures and Bloch-wave surface plasmon polariton (BW-SPP) in the gold nanoslit. The performance of the hybrid mode is optimized by changing the parameters of nanostructures such as period, width and thickness of gold-coated layer. Compared with conventional Tamm plasmon state which confines light using Bragg reflector and planer gold film, the hybrid mode has much stronger evanescent field on the metallic surface. Compared to the conventional BW-SPP mode, the hybrid mode has a much narrower linewidth.

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Herein, we show that surface plasmon resonance (SPR) biosensors can be used as a direct and real-time approach to accurately quantify virus–drug binding affinities and selectivity in drug screening. A dose-response calibration scheme based on real-time SPR sensorgrams was utilized for direct quantification of the affinity and selectivity of natural drugs against enteroviruses in Hand-Foot-Mouth Disease (HFMD). Using this approach, we demonstrated that chebulagic acid (CHLA) exhibits 2-fold higher affinity-selectivity performance toward enterovirus-71 and coxsackievirus-A16 than punicalagin, revealing that CHLA is a potential candidate for developing HFMD drugs made from natural ingredients.

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This study takes LMR (Lossy Mode Resonance) spectral measurement as an example, and the measurement uncertainty Type A evaluation method is applied to find a better measurement solution to reduce the measurement uncertainty under the same confidence level. We use the glass coated with ITO (Indium Tin Oxide) film as the LMR sensor to observe the average standard deviation of the LMR resonance wavelength for the measurement system composed of different broadband light sources and different spectrometers. The measurement uncertainty was analyzed, and finally, a suggestion is proposed to reduce measurement uncertainty.

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An open-cavity Fabry-Pérot interferometer (FPI) sensor formed by splicing a hollow-core fiber with a triangularly ground SMF is proposed. Very high gas pressure difference sensing sensitivity of 28.79 pm/psi can be realized. The proposed sensor also shows good repeatability and low temperature response of 0.2 pm/℃.

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Circulating tumor DNA of lung cancer was detected by a surface-enhanced Raman spectroscopy (SERS) biochip built with InGaN quantum wells (QWs). The nitride QWs were grown by metal-organic chemical vapor deposition. It is found that the QWs can enhance the sensitivity and reliability of DNA SERS signals. The result is due to abundant surface charges provided by the QWs.

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Recently, many researches indicate that there are plenty of the advantages of amorphous oxide semiconductors (AOSs), including low-temperature large-area deposition, high electron mobility, and mechanical flexibility. Meanwhile, several excellent review papers represent AOSs are a reliable and practical material. In these papers, IGZO has a lot of attention, but gallium which is rare makes IGZO extremely expensive. Therefore, we use InWZnO instead of IGZO in our experiments and successfully complete to make switches and Resistive Random Access Memory (RRAM). The major of this review is to use InWZnO on optical sensor and get good result.

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The characterization of MnPS3 and CdPS3 have been worked in this report, including the structural and optical properties. Both materials were grown by CVT method and the monoclinic structure was investigated by XRD spectra and TEM. Band-edge excitons of few-layer MnPS3 and CdPS3 were characterized via micro-thermal-modulated reflectance (μTR) and transmittance measurements from 20 to 300K. As resulted, the ionic bonding of MPX3 family contributes to the large bandgap and high sensitivity behavior, representing the hugely potential application in photodetector, optoelectronics and photo(electro)chemical catalysis.

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This research shows a novel approach using a multiple-layers graphene-based SPR sensor for rapid IgM detection. Measuring the principal fast axis angle of LB (α) of human IgM antibodies in concentrations of 0–250 ng/mL could demonstrate the validity of this sensor. Results show that the resolution of the proposed device is approximately 10 ng/mL and has a result of about three minutes, concluding that selectivity and sensitivity for the detection of IgM antibodies.

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We show that a plain self-mixing interferometer made around a commercial, low-cost laser diode, achieves a sensitivity to small vibrations of 6.5 pm/√Hz, that on a measurement bandwidth of 10 kHz corresponds to a minimum detectable amplitude of 0.65 nm (rms value at SNR=1).

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The guided modes of dual-tube antiresonant hollow-core fibers with different core diameters, thicknesses, and numbers of capillaries for capillary cladding designs by simulation are presented. The proper number of dual-tube capillaries enhances the fundamental mode power, and the 8-capillary cladding of antiresonant hollow-core fiber has the red-shifted as a function of the core diameter.

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Here we demonstrated the fabrication of an Al/SiO2/Si MIS device and its characterization of photo current generation. Responsivity as high as 1.4 A/W can be achieved at UV (200 nm~300 nm) and IR (800 nm ~ 900 nm) and with high contrast against visible light. In addition, the photo current decreases linearly as the increasing of the thickness of the SiO2 insulating layer. A current drifting mechanism is suggested to explain the result of the photo current characteristics.

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In this paper, the FROG (frequency resolved optical gating) real-time pulse measurement
system based on GRENOUILLE (grating-eliminated no-nonsense observation of ultrafast incident
laser light e-fields) combined with the self-developed DOES (direct optical-dispersion estimation by
spectrogram) algorithm is aimed at the speed and accuracy of GDD (group delay dispersion) analysis.
Compared with the analysis speed of the traditional PCGPA (principal component generalized projection
algorithm) algorithm of 70 ms, DOES can reach the analysis speed of 0.5ms. The analysis speed can be
increased by at least 140 times, and this technology can be applied to the subsequent real-time pulse
correction system.

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The gap-gate amorphous silicon thin-film transistor (a-Si TFT) is considered a good optical sensing device for its high sensing current and simple process. The reliability issue must be clarified before it can be used in applications such as fingerprint sensors. In this paper, the device is stressed under bias and illumination and the behavior is studied.

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This work presents the fabrication details and measured performance of amorphous-indium gallium zinc oxide thin-film transistors (a-IGZO TFTs). A high-performance a-IGZO TFT with self-aligned back-side exposure were investigated, exhibiting not only a high mobility of 10.08 V/cm2∙s, high ION/IOFF of 3.98×106 and sub-threshold swing of 90 mV/dec., also lower the fabrication cost for less photo-mask. Furthermore, self-aligned a-IGZO TFT could be applied for photo-sensor applications, reaching a high signal to noise ratio (SNR) of 2.68×103. To sum up, the self-aligned a-IGZO TFT are highly promising for photo-sensor and switch on pixel integration, realizing the idea of system on panel (SOP).

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Zinc ions plays several key roles in normal physiology and in pathological conditions as it is a transsynaptic mediator. The detection of zinc ion is also critical to study the dynamics of biological processes such as stroke and other brain traumas or to monitor the status of brains during surgery. Therefore, a bio-compatible optical fiber sensor for zinc ion detection in real-time is useful. In this work, three tip structures for the hydrogel-based optical fiber zinc sensors were designed to study the effect of tip structures on the efficiency of hydrogel-based optical fiber sensor via LightTools simulation.

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This study proposes a highly sensitive liquid core fiber Michelson interferometer (LCFMI) with silver mirror reaction (SMR) that can be heated by a 980 nm pumping laser diode (LD) to obtain desired steady-state high temperature (T). Experimental result shows the SMR-LCFMI with a micron-scaled liquid core fiber (LCF) is effectively heated to vary its interference spectra significantly. The proposed SMR-LCFMI is effectively heated by a laser-diode (LD) with a high sensitivity of about 4.64 nm/mA with a steadily linear response.

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A novel optomechanical system was proposed for measuring the depth in an object. In this system, because of the shallow depth of field making by diffuser, the focus position of the fixed focal lens is almost equal to the object distance. It only need to confirm the focus position without complicated calculations to get the depth data of the object. This system has been verified its feasibility in the experiment.

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A digital auxiliary interferometer is utilized as a clock to correct the swept laser non-linear frequency phenomenon by resampling the signal through the frequency-scanning interferences. A Hilbert-transform phase subdivision method is superior to analog Zero-crossing and Peak-resampling and experimentally showed that the target away from 100 cm was measured with a 0.004 cm standard deviation when the optical phased delay of the auxiliary interferometer was 50 cm. This Hilbert phase subdivision successfully demonstrates that the optical delay of an auxiliary interferometer is half of the length of a target distance for a compact LiDAR system.

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This paper proposes an air-sphere polymer fiber Fabry-Pérot (FP) interferometer (ASPFFPI) which is based on polymer-filled hollow core fiber (HCF). The front section of the HCF remained air was gradually formed an air-sphere during the filling process. The air-sphere can be formed as a fixed FP cavity by UV-cured polymer inside the HCF. The variation of the PF cavity is greatly enhanced by changing temperature (T) from exploiting the elastic polymer with high thermal expansion coefficient (TEC). Measurements reveal that when the ASPFFPIs with a similar size air-sphere, more amount of polymer can achieve higher T-sensitivity.

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Abstract: Dispersion shifted fiber and single mode fiber with different original Brillouin frequencies are used for simultaneous temperature and stress monitoring. From the 2x2 matrix, we find that the temperature increases from 25℃ to 70℃ (△ t=45℃) corresponding to 10.52GHz and 10.475GHz Brillouin frequency for DSF, individually. Also, the Brillouin frequency drift is 0.08GHz for single mode fiber, from 10.44 GHz to 10.52 GHz, corresponding to 729με stress variation.

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The polarimeter can determine whether the object is a left- or right-handed substance, and obtain the tiny polarization rotation of the sample through substituting the measured phase into the derived function.The best resolutions of the optical rotation and the concentration of the test solutions are 1.091×〖10〗^(-3) (degree) and 2.3×〖10〗^(-3)(g⁄(dl),) respectively. The optimal temperature resolution through the optical rotation measurement in the temperature range of 30℃~65℃ is 0.12°C.

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This work proposed a brand new approaching for the development of illuminometer with D1 mini controller based upon machine learning and data science. The study demonstrates three key results. D1 mini micro controller fully supports the measurement of illuminometer which range is from 0.1Lux to 1000Lux utilized by four bands. There is the highest resolution power 561 per lux in loading resistance 500 ohm. The threshold of AD value is 166 in this highest resolution power. Finally, the accuracies of machine learning are 73% and 64.3% by a three and four multi labels Logistic Regression Classifiers, respectively.

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The lossy mode resonance (LMR) sensor was applied to monitor the silver nanoparticles (SNPs), which was produced by a blue LED light array irradiating on the silver ion aqueous solution for the catalytic reaction. The generation process of the SNPs verified the correlation with the variation of the LMR wavelength in the experiment.

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Combining the Schottky barrier and the 12-μm-width inverted pyramid structure enables the Si-based photodetector to produce not only the greater confinement effect but also the stronger surface plasmon resonance to increase the excitation probability of hot carriers and leads to the mid-infrared photocurrent response to be enhanced.

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We fabricated and characterized planar-type InAlAs/InP single-photon avalanche detector (SPAD) with separate absorption, grading, charge, hetero-multiplication (SAGCHM) layer structure. The dark count rate (DCR) of 1.84 × 105 Hz, single-photon detection efficiency (SPDE) of 20.47 %, after-pulsing probability of 8.40 %, and time jitter of 1.940 ns were obtained when the fabricated SPAD was operated at room temperature with an excess biasing voltage of 0.9 V.

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In this experiment, germanium is selected as the material to absorb infrared light. Due to the difference in lattice constant between germanium and silicon, the difficulties encountered in the experiment are increased. Therefore, the structure needs to be designed to offset it. Infrared photodetector using vertical PIN diode combined with micro-hole arrays are dug out on the top of the component surface, which can be used to increase light absorption. The surface and cross-section of the film are observed by scanning electron microscope and finally, measured and analyze its electrical and optical properties.

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Since 2019, Coronavirus Disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has spread rapidly around the world. In this study, the highly conserved N gene sequence of SARS-CoV-2 was amplified by recombinase polymerase amplification (RPA), which has the advantages of rapidity, efficiency and high sensitivity. In addition, there were few methods for quantitative RPA, such as surface plasmon resonance (SPR), were used for quantitative detection of SARS-CoV-2. The assay’s limit of detection (LOD) is 10 copies/µL of SARS-CoV-2 DNA. This study developed quantitative detection methods for SARS-CoV-2.

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In this work, we fabricated a broadband photodetector based on two-dimensional (2D) layered perovskite (PSK)/ZnO nanorods (NRs) heterojunction. Integration of 2D layered perovskite with the ZnO NRs PDs can extend the photosensing capability covering ultraviolet light to visible light. The performance of 2D PSK/ZnO NRs PDs was optimized by changing the thickness of 2D PSK. Our results demonstrated that 2D PSK/ZnO NRs composites were promising materials for broadband wavelength detection from ultraviolet to visible light.

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In this article, we theoretically simulated a silicon core-based fiber Bragg grating and applied for temperature and environmental refractive index sensing simultaneously. The sensitivities of the temperature and refractive index were 79.25 pm/oC and -91.24 dB/RIU, respectively, within a range of the temperature in 0 to 45 oC and the refractive index in 1.0 to 1.4. The proposed fiber sensor head can provide a method with simple and high sensitivity for various sensing target.

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In this paper, we propose a contact-type fiber grating vibration sensor, which is based on the grating wavelength shift caused by the induced strain from the vibration signal for applying in monitoring a motor-operating performance.

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A novel fiber hydrophone is proposed for detecting acoustic-wave signals of underwater. The hydrophone consists of fiber Bragg grating, silicon thin-film, and 3D print structure.

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The Hilbert-transform phase detection method implements a digital auxiliary interferometer and resamples the signal to compensate for the nonlinear frequency sweeping phenomenon. When the data acquisition sampling rate is set to the maximum of 1 million points/s, the resampling points from zero-crossing and Hilbert-transform are around 200,000 and 1,000,000, respectively. Compared with the zero-crossing resampling, the Hilbert-transform can precisely characterize a velocity of 200 mm/s and its standard deviation of 0.749 mm/s.

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We proposed a two-dimension bending sensor based on two fiber Bragg gratings by using a special design structure and resin material for detecting both the bending curvature and bending direction of sensing head in endoscope.

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In this study, a transmission linear encoder based-on double-diffraction design is proposed for displacement measurement. By using the design concept of double-diffraction, the system sensitivity and resolution can be enhanced. Experimental results show that the resolution and repeatability of the proposed method can reach 3.6 nm and 1.69 nm, respectively.

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This work mainly studied the optimization of chemical bath deposition (CBD) of zinc selenide (ZnSe) thin films and its application in photodetectors. The deposition time had a significant effect on the film properties. All ZnSe thin films exhibited a cubic crystal structure with predominant (111) orientation. Through two-step CBD deposition and copper doping, the photo response of the device to blue light was greatly improved, and the maximum photo responsivity increased significantly by 10^5 to 104 mA/W.

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AlGaN-based photodetector (PD) with multi-AlGaN/GaN channels has been demonstrated on the sapphire substrate. The multi-AlGaN/GaN layer has been transformed into the porous-AlGaN/n-GaN stack structures through the wet etching process. 25.2nm-thick porous-AlGaN layer and 24.8nm-thick GaN layer were observed clearly in the TEM micrograph. The insulated AlGaOx layers were formed surrounding the porous structure to suppress the surface leakage current. High photo-current and high responsivity were measured in the treated PD structures. Peak responsivity values were observed at 335nm of the wet etched PD structures compared to the ST-PD structure.

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In this work, we proposed a 2f quasi-optical system for solution characterization. The 2f quasi-optical system is driven by a Vector Network Analyzer (VNA). We successfully measured the optical property of water in the sub-terahertz region under 18 GHz to 26.5 GHz. It has been compared with available data to justify the accuracy of the quasi-optical system.

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The photo-reduction of silver nanoparticle, as solver nitrate solution being irradiated by LED light, on gold nanoprisms as substrate is studied. The medium contains ascorbic acid as reducing agent. The productions of this photo-reduction of are 3D flower-like structures with many sharp edges. These bimetallic nanocomposites serve as an excellent substrate for SERS enhancement for detecting R6G. The deposition of Ag on Au prisms also makes these bimetallic nanocomposites stable for a longer period of time.

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In this paper, we propose a novel fiber sensor by using a fiber grating and a special packaged structure. The operating principle is based on the grating wavelength shift which is proportional to the applied pressure.

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This study develops a fiber-optic sensor based on dual nanoplasmonic structures for refractive index sensing by a CO2 laser engraving. The sensor based on dual nanoplasmonic structures was modified by gold sphere nanoparticles and gold nanorods simultaneously in two different fiber sensing zones. This type of sensor has shown the capacity of simultaneously sensing two different channels of localized surface plasmon resonance signals, with a relatively high refractive index sensitivity.

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This study develops a V-shaped fiber-optic interferometer sensor by CO2 laser micromachining. The V-shaped fiber-optic interferometer advantage is simple of composition, miniaturization, ease of operation, and excellent sensitivity to the surrounding refractive index. According to experimental results, the V-shaped fiber-optic interferometer is temperature insensitive and for the refractive index is a growth curve exponential increase.

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In this study, dislocated nanoslit pairs in gold films are designed to achieve spatial discrimination for molecules with opposite chirality. Through finite difference time domain (FDTD) analysis, optimal structural parameters are obtained that yields a chiral dependent optical force of 1.5 µN/Wcm2 on a molecule-nanoparticle hybrid of 10 nm in diameter. This force can stably trap/propel chiral molecules at room temperature (25 °C) against the Brownian motions in water.

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We present the synthesis of Au nanoparticles on Cu2O microspheres to form noble-metal/semiconductor nanocomposites for the strong Raman signal enhancement by simultaneous utilization of electromagnetic and chemical mechanisms. The Au/Cu2O nanocomposites produced by the polyol and photochemical methods own the excellent SERS performance, including the enhancement factor around 10^12 and the limit of detection about 10^-13 M. These superior characteristics can be attributed to strong interaction between nanocomposites and organic dye molecules by localized surface plasmon resonance and effective charge transfer.

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Neonicotinoids are a class of broad-spectrum insecticide which contain potential risk to harmless insects such as bees. In our research, we apply neonicotinoid-bound odorant binding protein 2 (OBP2) with flow digital nanoplasmon-metry (Flow DiNM) which based on the spectral image contrast method of gold nanoparticles (AuNPs) as sensing strategy. The detection limit is down to 5 ppb within only a 30-minute reaction and 500 μL sample volume requirement. Compared with the conventional method, e.g. ESI-MS, Flow DiNM provides much higher sensitivity, feasibility, and faster readout on neonicotinoids detection.

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A birefringent sensing head was demonstrated successfully for the noninvasive fluidic concentration measurement based on total internal reflection to enhance measurement sensitivity in a common path heterodyne interferometer. The best measurement resolutions of concentration and RI variations are 16 ppm and 3×10-7 RIU, respectively.

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Phase-change materials (PCMs) provide a specific combination of optical tuning properties. The binary semiconducting chalcogenide Sb2S3 is considered one of the promising candidates; especially for its intrinsic high refractive index, low loss and wide bandgap properties in near infrared (NIR). Here, the Sb2S3 transformation from amorphous to crystal state embedded between the distribute Bragg reflector (DBR) and metal layer. With the proposed design, phase-change Tamm plasmon–polariton (PC-TPP) resonance could be produce. The PC-TPP resonance has a 70 nm modulation in wavelengths. Also, the resonance achieves around 100 nm-shifted in NIR at the designed incident angle.

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Preliminary absorbance measurements of various solutions and plastic particles in
the characteristic infrared band of microplastics were conducted. The measuring configuration
is based on the structure of Michelson interferometer. Five solutions and two sizes of plastic
particles were tested, including pure water, sodium chloride solution, alcohol and solutions with
added dispersant. Additionally, a semi-ellipsoid sensing structure with randomly distributed
microplastics is simulated by using the ASAP raytracing engine.

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In this work, we present a high sensitivity surface plasmon resonance image (SPRi)
system for biosensing. An automated system is used by computer program to connect all
instruments, including robot arm, pump and CCD camera. using the SPR in periodic metallic
nanostructures, a position-sensitive measurement method for tracking resonant signals. The
system can available in high-throughput, label free and immediacy. And it is also unnecessary
professional operation and user-friendly interface. In summary, the image-based system
performs high sensitivity under refractive index change and stable noise level. Also, the SPRi
would make the real time bio-measure more simply operated.


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A weeding mechanism and a camera on top of a robotic arm is applied to achieve the goal of automatic weeding. The whole set is installed at the bottom of an unmanned ground vehicle. A camera nearby the weeding mechanism is also facilitated. During the movement of the vehicle, image of soybean plants and weed in the field are captured. Through image processing algorism, weed is recognized and can be removed.

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Better sensitivity of a biosensor could boost up the detection limit of analytes. In this paper, we fabricated an oblique flat sheet (OFS) metamaterial perfect absorber (MPA) by e-beam lithography process for a seed layer and then by oblique deposition. When considering the stochastic nature of oblique-fat-sheet, the randomly distributed oblique-wire-bundle (OWB) were used and in simulation, its sensitivity is boosted up to 3319 nm/RIU. Finally, we demonstrate that the sensitivity is 1329 nm/RIU of detection in different glucose solutions, which is four times higher than the 330 nm/RIU of the planar MPA.

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Amorphous indium–gallium–oxide solar–blind metal–semiconductor–metal photodetectors were fabricated by using co-sputtering method. There are three samples with different oxygen concentrations, namely, sample A without oxygen, sample B with 2% oxygen concentration, and sample C with 4% oxygen concentration. The applied bias was 5 V during device characterization. Sample C showed significantly better value of UV-to-visible rejection ratios and dynamic responses of the decay times. And the performance of the rise time is approximately proportional to the oxygen flow ratio.

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This paper presents the three types of sun sensors include the advantages of compact, efficient, and simple of design for the satellite attitude of CubeSat. In begin with, a rectangular coarse sun sensor (CSS) is designed to determine the Sun’s position and increase the field of view. In addition, the others belong to the fine sun sensors (FSS) consists of more than one independent photodiode and have slit masks to get high level accuracy. Base on the formula and simulation results, we can acquire the attitude determination capabilities with minimal process for CubeSat.

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This study aims to develop a coffee roasting degree analyzer with dual-channel sensing. In this study, samples were prepared for coffee beans with different roasting degrees and varieties. Then the spectrum measurements of visible and infrared light channels were performed on these coffee beans to construct a data set, and then principal component analysis was used to find the critical spectrum, and finally the model was used. The preliminary test results of this study show that it is found that a low-cost analyzer with a high-resolution rate comparable to Agtron can be obtained through the process steps of this study.

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In this paper, we reported a high-performance broadband organic phototransistor (OPT) using a tri-layer heterostructure of pentacene/SubPc/C60. Utilizing the synergistic effect of strong complementary photo-absorption, efficient exciton dissociation, and high mobility of the channel layer, a high responsivity in the visible region was realized. The PVA/PVP bilayer gate dielectric-based OPT with the tri-layer light-absorbing layer (pentacene/SubPc/C60) achieves high responsivity to 122 A/W at 660 nm and high carrier mobility to 4.48 cm2 V-1 s-1.

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