School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
Centre for Disruptive Photonic Technologies, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.
Nat Commun. 2023 Jun 9;14(1):3421. doi: 10.1038/s41467-023-39071-7.
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 × 10), 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.
无滤光片的小型化偏振敏感光电探测器在下一代片上偏振计中有重要应用。然而，其偏振灵敏度迄今为止受到固有低消光率和低效光子-电子转换的限制。在这里，我们通过将偏振敏感吸收转化为大温度梯度以及完美等离子体吸收的有限尺寸效应，实验实现了基于一维碲纳米带的小型化探测器，从而显著提高了光热电响应。我们的器件表现出零偏置响应率为 410V/W 和超高偏振比（2.5×10），以及峰值偏振角灵敏度为 7.10V/W•度，比文献报道的高一个数量级。所提出的器件还在简单的几何配置中实现了全线性偏振检测。偏振编码通信和光学应变测量的演示表明了所提出器件的巨大潜力。我们的工作为具有超高偏振灵敏度的小型化室温红外光电探测器提供了一种可行的解决方案。
