According to optical diffraction limit, the photoresponsity of nanowire(NW)-based photodetector exponentially decreases when its NW diameter reduces to the range of deep subwavelength. In this paper, we demonstrate a ...According to optical diffraction limit, the photoresponsity of nanowire(NW)-based photodetector exponentially decreases when its NW diameter reduces to the range of deep subwavelength. In this paper, we demonstrate a photoresponse-enhanced method of the deep-subwavelength Ga As NW photodetector by using a plasmon-driven dipole antenna. Considering that the enhancement is extremely influenced by the shape and size of antenna, the structure of antenna is optimized by finite difference time domain(FDTD) solutions. The optimal structure of antenna optimizes the responsivity-enhanced factors to 1123.3 and 224.7 in NW photodetectors with NW diameters of 20 nm and 60 nm, respectively. This photoresponse-enhanced method is promising for easy-integration high-performance nanoscale photodetectors.展开更多
基金supported by the National Natural Science Foundation of China (Nos.61774021, 61806007 and 61911530133)the Fund of State Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications),China (No.IPOC2019ZT07)+4 种基金the Fundamental Research Funds for the Central Universities (No.2018XKJC05)the Project of Key Science and Technology in Henan Province (No.202102310562)the Fund of Key Laboratory of Oracle Bone Inscriptions Information Processing,Ministry of Education of China (No.OIP2019M006)the Research Foundation of Anyang Normal University (No.AYNUKPY-2019-04)the Anyang Scientific and Technological Project (No.2021C01X012)。
文摘According to optical diffraction limit, the photoresponsity of nanowire(NW)-based photodetector exponentially decreases when its NW diameter reduces to the range of deep subwavelength. In this paper, we demonstrate a photoresponse-enhanced method of the deep-subwavelength Ga As NW photodetector by using a plasmon-driven dipole antenna. Considering that the enhancement is extremely influenced by the shape and size of antenna, the structure of antenna is optimized by finite difference time domain(FDTD) solutions. The optimal structure of antenna optimizes the responsivity-enhanced factors to 1123.3 and 224.7 in NW photodetectors with NW diameters of 20 nm and 60 nm, respectively. This photoresponse-enhanced method is promising for easy-integration high-performance nanoscale photodetectors.
