Abstract

Binary metal layers composed of a grating and a thin film are designed for high-responsivity metal–insulator–metal (MIM) near-infrared hot-electron photodetectors (HEPDs). The binary metal grating structure HEPDs demonstrate a strong asymmetrical optical absorption and result in a high current responsivity. In our devices, the top and bottom absorption ratio is as high as 76:1, much higher than that in the traditional grating structure HEPDs. The maximum zero-biased responsivity is 0.585 mA/W at 1550 nm by employing a five-step electrical model, which is 3.42 times that of the traditional silver grating structure devices. Simply changing the grating period enables spectrally selective photodetection covering a wide range of 500 nm at the near-infrared band with net absorption higher than 0.95 and linewidths narrower than 0.7 meV.

© 2021 Optica Publishing Group

Design of a binary metal micron grating and its application in near-infrared hot-electron photodetectors

Xiao-Long Hu, Fen Li, Shi-Hang Xu, and Wen-Jie Liu
Opt. Lett. 48(15) 4033-4036 (2023)

High-Q quadrupolar plasmonic lattice resonances in horizontal metal–insulator–metal gratings

Xinyu Fang, Lei Xiong, Jianping Shi, and Guangyuan Li
Opt. Lett. 46(7) 1546-1549 (2021)

Ultranarrow-bandwidth planar hot electron photodetector based on coupled dual Tamm plasmons

Wenyue Liang, Zheng Xiao, Haitao Xu, Haidong Deng, Hai Li, Wanjun Chen, Zhaosu Liu, and Yongbing Long
Opt. Express 28(21) 31330-31344 (2020)

Tunable infrared hot-electron photodetection by exciting gap-mode plasmons with wafer-scale gold nanohole arrays

Hao Ding, Shaolong Wu, Cheng Zhang, Liujing Li, Qingxin Sun, Luwei Zhou, and Xiaofeng Li
Opt. Express 28(5) 6511-6520 (2020)

Infrared hot-carrier photodetection based on planar perfect absorber

Yaohui Zhan, Kai Wu, Cheng Zhang, Shaolong Wu, and Xiaofeng Li
Opt. Lett. 40(18) 4261-4264 (2015)