Session Index

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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