Long-wave infrared photothermoelectric detectors with ultrahigh polarization sensitivity

Mingjin Dai, Chongwu Wang, Bo Qiang, Yuhao Jin, Ming Ye, Fakun Wang, Fangyuan Sun, Xuran Zhang, Yu Luo () and Qi Jie Wang ()
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Mingjin Dai: Nanyang Technological University
Chongwu Wang: Nanyang Technological University
Bo Qiang: Nanyang Technological University
Yuhao Jin: Nanyang Technological University
Ming Ye: Nanyang Technological University
Fakun Wang: Nanyang Technological University
Fangyuan Sun: Nanyang Technological University
Xuran Zhang: Nanyang Technological University
Yu Luo: Nanyang Technological University
Qi Jie Wang: Nanyang Technological University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Filter-free miniaturized polarization-sensitive photodetectors have important applications in the next-generation on-chip polarimeters. However, their polarization sensitivity is thus far limited by the intrinsic low diattenuation and inefficient photon-to-electron conversion. Here, we implement experimentally a miniaturized detector based on one-dimensional tellurium nanoribbon, which can significantly improve the photothermoelectric responses by translating the polarization-sensitive absorption into a large temperature gradient together with the finite-size effect of a perfect plasmonic absorber. Our devices exhibit a zero-bias responsivity of 410 V/W and an ultrahigh polarization ratio (2.5 × 104), as well as a peak polarization angle sensitivity of 7.10 V/W•degree, which is one order of magnitude higher than those reported in the literature. Full linear polarimetry detection is also achieved with the proposed device in a simple geometrical configuration. Polarization-coded communication and optical strain measurement are demonstrated showing the great potential of the proposed devices. Our work presents a feasible solution for miniaturized room-temperature infrared photodetectors with ultrahigh polarization sensitivity.

Date: 2023
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DOI: 10.1038/s41467-023-39071-7

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