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Chunxian Tao,Zhaoxia Han,Jun Ruan,Shunpeng Shu,Zhongrong Lu,Ruijin Hong,Dawei Zhang 한국광학회 2017 Current Optics and Photonics Vol.1 No.4
In order to investigate the ultraviolet-excited photoluminescence properties of phosphor coatings andtheir relationship to thickness, Lumogen coatings with different thicknesses were deposited on quartzsubstrates and charge-coupled device chips by thermal evaporation. The variation of the film thicknessaffected the crystallite size, surface roughness and fluorescence signal. It was found that the Lumogencoating with the thickness of 420 nm has the largest luminescent signal and conversion efficiency, andthe corresponding coated charge-coupled devices had the maximum quantum efficiency in the ultraviolet. These results provided one key parameter for improving the sensitivity of Lumogen coated charge-coupleddevices to ultraviolet light.
Liao Jing,Liu Qingyou,Hong Ruijin,Tao Chunxian,Wang Qi,Lin Hui,Han Zhaoxia,Zhang Dawei 한국물리학회 2022 Current Applied Physics Vol.36 No.-
Here we introduce a facile method to fabricate patterned indium tin oxide (ITO) thin films via selective laser ablation at ambient conditions. By scanning the ITO thin films with focused Nd: YAG pulsed laser, the ITO thin films were selective ablated and patterned without using any conventional chemical etching or photolithography steps. Then we investigated the effects of scanning rate for the structure, morphology and optical properties of patterned ITO thin film. These results indicate that the epsilon-near-zero (ENZ) wavelength of ITO thin films can be tuned from 1100 nm to 1340 nm by adjusting the period of the micro-hole array in microstructure. The nonlinear absorption response of patterned ITO films was about 2.85 time than of the as-deposited ITO thin film. Additionally, the results of the Finite-Difference Time-Domain (FDTD) simulation are in good agreement with those of the experiments.
Enhancement of Photoluminescence by Ag Localized Surface Plasmon Resonance for Ultraviolet Detection
Yanlei Lyu,Jun Ruan,Mingwei Zhao,Ruijin Hong,Hui Lin,Dawei Zhang,Chunxian Tao 한국광학회 2021 Current Optics and Photonics Vol.5 No.1
For higher sensitivity in ultraviolet (UV) and even vacuum ultraviolet (VUV) detection of siliconbased sensors, a sandwich-structured film sensor based on Ag Localized Surface Plasmon Resonance (LSPR) was designed and fabricated. This film sensor was composed of a Ag nanoparticles (NPs) layer, SiO 2 buffer and fluorescence layer by physical vapour deposition and thermal annealing. By tuning the annealing temperature and adding the SiO 2 layer, the resonance absorption wavelength of Ag NPs matched with the emission wavelength of the fluorescence layer. Due to the strong plasmon resonance coupling and electromagnetic field formed on the surface of Ag NPs, the radiative recombination rate of the luminescent materials and the number of fluorescent molecules in the excited state increased. Therefore, the fluorescent emission intensity of the sandwich-structured film sensor was 1.10–1.58 times at 120–200 nm and 2.17–2.93 times at 240–360 nm that of the single-layer film sensor. A feasible method is provided for improving the detection performance of UV and VUV detectors.