Multifunctional 2d infrared photodetectors enabled by asymmetric singular metasurfaces
Abstract
Two-dimensional materials offering ultrafast photoresponse suffer from low intrinsic absorbance, especially in the mid-infrared wavelength range. Challenges in 2d material doping further complicate the creation of light-sensitive junctions. Here, we experimentally demonstrate a graphene-based infrared detector with simultaneously enhanced absorption and strong structural asymmetry enabling zero-bias photocurrent. A key element for those properties is an asymmetric singular metasurface (ASMS) atop graphene with keen metal wedges providing singular enhancement of local absorbance. The ASMS geometry predefines extra device functionalities. The structures with connected metallic wedges demonstrate polarization ratios up to 200 in a broad range of carrier densities at a wavelength of 8.6 m. The structures with isolated wedges display gate-controlled switching between polarization-discerning and polarization-stable photoresponse, a highly desirable yet scarce property for polarized imaging.
Keywords
Cite
@article{arxiv.2411.06480,
title = {Multifunctional 2d infrared photodetectors enabled by asymmetric singular metasurfaces},
author = {Valentin Semkin and Aleksandr Shabanov and Kirill Kapralov and Mikhail Kashchenko and Alexander Sobolev and Ilya Mazurenko and Vladislav Myltsev and Egor Nikulin and Alexander Chernov and Ekaterina Kameneva and Alexey Bocharov and Dmitry Svintsov},
journal= {arXiv preprint arXiv:2411.06480},
year = {2025}
}