Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41566-021-00819-6
Title: Mid-infrared semimetal polarization detectors with configurable polarity transition
Authors: Wei, Jingxuan 
Xu, Cheng 
Dong, Bowei 
Qiu, Cheng-Wei 
Lee, Chengkuo 
Keywords: Science & Technology
Physical Sciences
Optics
Physics, Applied
Physics
PHOTODETECTORS
POLARIMETRY
GENERATION
PLASMONS
SENSOR
Issue Date: 24-May-2021
Publisher: NATURE RESEARCH
Citation: Wei, Jingxuan, Xu, Cheng, Dong, Bowei, Qiu, Cheng-Wei, Lee, Chengkuo (2021-05-24). Mid-infrared semimetal polarization detectors with configurable polarity transition. NATURE PHOTONICS 15 (8) : 614-+. ScholarBank@NUS Repository. https://doi.org/10.1038/s41566-021-00819-6
Abstract: On-chip polarization-sensitive photodetectors offer unique opportunities for next-generation ultra-compact polarimeters. So far, mainstream approaches have relied on the anisotropic absorption of natural materials or artificial structures. However, such a model is inherently restricted by correlation between the polarization ratio (PR) and diattenuation, leading to small PR values (1 < PR < 10). Here, we report nanoantenna-mediated semimetal photodetectors, which enable configurable polarity transition by exploiting the vectorial and non-local photoresponse in semimetals. By tuning the orientation of nanoantennas, PR values vary from positive (unipolar regime) to negative (bipolar regime), covering all possible numbers (1 → ∞/−∞ → −1). In particular, the PR values at the polarity-transition point could approach infinity. Such a polarity transition hereby transcends the conventional PR–diattenuation relationship. Furthermore, our device allows the subtle measurement of polarization-angle perturbation down to 0.02° Hz−1/2 in the mid-infrared range. Our findings highlight the potential of semimetals as a promising material platform for miniaturized polarimetry.
Source Title: NATURE PHOTONICS
URI: https://scholarbank.nus.edu.sg/handle/10635/215039
ISSN: 1749-4885
1749-4893
DOI: 10.1038/s41566-021-00819-6
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