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arXiv · 2204.03980

Geometric Filterless Photodetectors for Mid-infrared Spin Light

Jingxuan Wei·Yang Chen·Ying Li·Wei Li·Junsheng Xie·Chengkuo Lee·Kostya S Novoselov·Cheng-Wei Qiu
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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$^o$ Hz$^{-1/2}$. 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.

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Jingxuan Wei, Yang Chen, Ying Li, Wei Li, Junsheng Xie, Chengkuo Lee, Kostya S Novoselov, Cheng-Wei Qiu. 2022-04-08. Geometric Filterless Photodetectors for Mid-infrared Spin Light. https://doi.org/10.1038/s41566-022-01115-7

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