Monochromatic Polarization‐Sensitive Photothermoelectric Detection via Plasmonic Quasi‐BICs

IF 9.8 1区 物理与天体物理 Q1 OPTICS
Shuai Li, Zeyu Wu, Xiaoshan Liu, Qian Ye, Guiqiang Liu, Jing Chen, Wei Du, Chaojun Tang, Zhengqi Liu
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引用次数: 0

Abstract

Bound states in the continuum (BICs) provide a robust mechanism for enhancing the resonance quality factor (Q‐factor) by confining light in non‐radiative modes. Due to the large intrinsic losses, the Q‐factors of plasmonic resonances are typically limited. A plasmonic photothermoelectric metasurface based monochromatic polarization detector with a high polarization ratio () is proposed and simultaneously realize linear sensing with the polarization angle sensitivity of 0.67 µA (W·deg)−1 by the excitation of high‐Q quasi‐BICs resonances. In general, with the purpose to achieve the maximal circular dichroism (CD) response, symmetry breaking is introduced, which inevitably leads to the radiative losses and the significantly decreased Q‐factor, therefore fundamentally limiting the simultaneous realization of polarization modulation and high monochromaticity. Herein, a circular polarization‐sensitive device is further realized () with a high CD (>0.9) response under the situation of intrinsic chirality. Such simultaneous performance of high PR, CD, and sharp resonance are related to the fact that optical absorption is primarily dominated by the grating walls while the offset of the geometry perturbation serves only to break the mirror symmetry and generate the CD response. Our research provides a novel approach for on‐chip optical devices in high‐speed monochromatic detection.
利用等离子体准bic进行单色偏振敏感光热电探测
连续介质中的束缚态(bic)通过将光限制在非辐射模式中,为提高共振质量因子(Q因子)提供了一个强大的机制。由于等离子体共振的固有损耗很大,其Q因子通常是有限的。提出了一种高极化比()的等离子体光热电超表面单色偏振探测器,通过激发高Q准bic共振,可同时实现偏振角灵敏度为0.67µA (W·度)−1的线性传感。一般来说,为了获得最大的圆二色性(CD)响应,引入了对称性破缺,这不可避免地导致辐射损耗和Q因子的显著降低,从而从根本上限制了偏振调制和高单色性的同时实现。在本征手性的情况下,进一步实现了具有高CD (>0.9)响应的圆偏振敏感器件。这种高PR、高CD和高共振的同时性能与光学吸收主要由光栅壁主导有关,而几何摄动的偏移只会破坏镜面对称性并产生CD响应。我们的研究为片上光学器件的高速单色检测提供了一种新的方法。
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来源期刊
CiteScore
14.20
自引率
5.50%
发文量
314
审稿时长
2 months
期刊介绍: Laser & Photonics Reviews is a reputable journal that publishes high-quality Reviews, original Research Articles, and Perspectives in the field of photonics and optics. It covers both theoretical and experimental aspects, including recent groundbreaking research, specific advancements, and innovative applications. As evidence of its impact and recognition, Laser & Photonics Reviews boasts a remarkable 2022 Impact Factor of 11.0, according to the Journal Citation Reports from Clarivate Analytics (2023). Moreover, it holds impressive rankings in the InCites Journal Citation Reports: in 2021, it was ranked 6th out of 101 in the field of Optics, 15th out of 161 in Applied Physics, and 12th out of 69 in Condensed Matter Physics. The journal uses the ISSN numbers 1863-8880 for print and 1863-8899 for online publications.
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