摘要
A polarization-insensitive plasmonic absorber is designed consisting of Au fishnet structures on a TiO2 spacer/Ag mirror. The fishnet structures excite localized surface plasmon and generate hot electrons from the absorbed photons, while the TiO2 layer induces Fabry–Perot resonance, and the Ag mirror acts as a back reflector.Through optimizing the TiO2 layer thickness, numerical simulation shows that 97% of the incident light is absorbed in the Au layer. The maximum responsivity and external quantum efficiency of the device can approach 5 mA/W and ~1%, respectively, at the wavelength of 700 nm.
作者
杨志强
杜康
张文定
蔡树仁
梅霆
Zhiqiang Yang;Kang Du;Wending Zhang;Soojin Chua;Ting Mei(Key Laboratory of Space Applied Physics and Chemistry,Ministry of Education,and Shaanxi Key Labora tory of Optical Information Technology,School of Science,North Western Polytechnical University,Xi'an 710072,China;Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583,Singapore;LEES Program,Singapore-MIT Alliance for Research&Technology(SMART),Singapore 138602,Singapore)
基金
the National Natural Science Foundation of China (NSFC)(Nos. 91950207,61675171,and 61675169)
Fundamental Research Funds for the Central Universities of China (Nos. 3102017-HQZZ022 and 3102017zy021)。
