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Photo-Thermoelectric Conversion of Plasmonic Nanohole Array
摘要： Plasmonic photo-thermoelectric conversion offers an alternative photodetection mechanism that is not restricted by semiconductor bandgaps. Here, we report a plasmonic photodetector consisting of an ultra-thin silver film with nanohole array, whose photodetection mechanism is based on thermoelectric conversion triggered by plasmonic local heating. The detector exhibits a maximum photocurrent at the wavelength of the surface plasmon polaritons, determined by the periodicity of the nanoholes. Hence, the response wavelength of the detector can be controlled via the morphological parameters of the nanohole pattern. The contribution of plasmonic local heating to thermoelectric conversion is verified experimentally and numerically, enabling discussion on the mechanisms governing light detection. These results provide a starting point for the development of other nanoscale photodetectors.
关键词： plasmon,photodetector,silver film,plasmonic local heat,thermoelectric conversion,nanohole
更新于2025-09-23 15:21:01
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High performance flexible organic photomultiplication photodetector based on ultra-thin silver film transparent electrode
摘要： Flexible and lightweight photomultiplication-type organic photodetectors (PM-OPDs) have attracted wide attention for their broad application prospects, especially in the field of wearable electronic products. However, the common used indium tin oxide (ITO) conductive anode is not conducive to realize high-performance flexible PM-OPD due to its rigidity and fragility. Here, on the flexible polyethylene terephthalate (PET) substrate, we successfully fabricate highly sensitive poly 3-hexylthiophene:phenyl-C70-butyric acid methyl ester (P3HT:PC70BM, 100:1) based PM-OPDs using ultra-thin silver films as the transparent anode. Specifically, a 1 nm thick MoO3 layer is utilized as the wetting layer for facilitating the silver film percolation, and a 2 nm thick MoO3 layer, as the hole transport layer, is coated on top of the ultra-thin silver film before coating the P3HT:PC70BM film. The as-prepared flexible PM-OPDs based on the ultra-thin silver film exhibit the optimal external quantum efficiency (EQE) and responsivity (R) of 1.3×105 % and 388.4 A/W, respectively, under -15 V bias, which are 1.98 times and 2.15 times greater than those of the ITO anode based device. More importantly, the device has good flexibility with the EQE maintaining 70.6% of its initial value after 10 times of bending, and 51.4% of its initial value after 1000 times of bending. This work paves the way for developing flexible PM-OPDs as well as other flexible optoelectronic devices.
关键词： multiplication,transparent electrode,photodetectors,silver film,flexible
更新于2025-09-19 17:13:59
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Hot-wire Anemometer Based on Etched Fiber Bragg Grating Coated with Silver Film
摘要： A hot-wire anemometer is proposed based on a cladding-etched optical fiber Bragg grating (FBG) coated with a layer of silver film, which absorbs light from a pump laser via a waist-enlarged optical fiber bitaper to generate heat and hence a relatively high initial temperature of the FBG. Experimental results show that cladding etching of the FBG increases the initial temperature and hence improves the measurement sensitivity and range. High sensitivity up to ~696.3 pm/(m/s) is achieved and the measurement range covers 0~20 m/s.
关键词： silver film,FBG,waist-enlarged optical fiber bitaper,etched,hot-wire anemometer
更新于2025-09-16 10:30:52