Geometric Filterless Photodetectors for Mid-infrared Spin Light
Abstract
Free-space circularly polarized light (CPL) detection, requiring polarizers and waveplates, has been well established, while such spatial degree of freedom is unfortunately absent in integrated on-chip optoelectronics. So far, those reported filterless CPL photodetectors suffer from the intrinsic small discrimination ratio, vulnerability to the non-CPL field components, and low responsivity. Here, we report a distinct paradigm of geometric photodetectors in mid-infrared exhibiting colossal discrimination ratio, close-to-perfect CPL-specific response, a zero-bias responsivity of 392 V/W at room temperature, and a detectivity of ellipticity down to 0.03 Hz. Our approach employs plasmonic nanostructures array with judiciously designed symmetry, assisted by graphene ribbons to electrically read their near-field optical information. This geometry-empowered recipe for infrared photodetectors provides a robust, direct, strict, and high-quality solution to on-chip filterless CPL detection and unlocks new opportunities for integrated functional optoelectronic devices.
Keywords
Cite
@article{arxiv.2204.03980,
title = {Geometric Filterless Photodetectors for Mid-infrared Spin Light},
author = {Jingxuan Wei and Yang Chen and Ying Li and Wei Li and Junsheng Xie and Chengkuo Lee and Kostya S Novoselov and Cheng-Wei Qiu},
journal= {arXiv preprint arXiv:2204.03980},
year = {2023}
}