securing the stability. We demonstrate a CPL detector based on “S”-shaped chiral Ag nanowires/InAs/Si heterostructures, where the meticulous construction of the “S”-shaped chiral Ag nanowires with the overlaying InAs channel enables a substantial absorption asymmetry in InAs due to differentiated localized surface plasmon resonances excited by left- and right-circularly polarized (LCP and RCP) light. The InAs serves as a conductive channel, achieving significant electrical gain through photoconductive effects assisted by photogating, gate modulation, and
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Electrical-gain-assisted circularly polarized photodetection based on chiral plasmonic metamaterials
Chenghao Chen, Zhenhai Yang, Tianyi Hang, Yining Hao, Yijing Chen, Chengzhuang Zhang, Jiong Yang, Xiaoyi Liu, Xiaofeng Li, Guoyang Cao
Research context
Abstract Circularly polarized light (CPL) detectors based on chiral organic materials or inorganic structures hold great potential for highly integrated on-chip applications; however, these devices usually have to seek an optimal balance among the asymmetry factor (g), responsivity (R), and stability. Here, we aim to break such a limitation by combining chiral inorganic plasmonic metamaterials with electrical gain, by which one can enhance both g and R while simultaneously securing the stability. We demonstrate a CPL detector based on “S”-shaped chiral Ag nanowires/InAs/Si heterostructures, where the meticulous construction of the “S”-shaped chiral Ag nanowires with the overlaying InAs channel enables a substantial absorption asymmetry in InAs due to differentiated localized surface plasmon resonances excited by left- and right-circularly polarized (LCP and RCP) light. The InAs serves as a conductive channel, achieving significant electrical gain through photoconductive effects assisted by photogating, gate modulation, and trap effects. The proposed inorganic stable device exhibits a high electrical g of ~1.56, an ultra-high R of ~33,900 A W−1, a large specific detectivity of ~1.8
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Chenghao Chen, Zhenhai Yang, Tianyi Hang, Yining Hao, Yijing Chen, Chengzhuang Zhang, Jiong Yang, Xiaoyi Liu, Xiaofeng Li, Guoyang Cao. Electrical-gain-assisted circularly polarized photodetection based on chiral plasmonic metamaterials. Light: Science & Applications (2025). https://doi.org/10.1038/s41377-025-01932-9
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