broadband circularly polarized light photodetector using achiral all-dielectric nanostructures
Source PDF · page 1RESEARCH PAPER
High discrimination ratio, broadband circularly polarized light photodetector using dielectric achiral nanostructures
Guanyu Zhang, Xiaying Lyu, Yulu Qin, Yaolong Li, Zipu Fan, Xianghan Meng, Yuqing Cheng, Zini Cao, Yixuan Xu, Dong Sun, Yunan Gao, Qihuang Gong, Guowei Lyu
Research context
The on-chip measurement of polarization states plays an increasingly crucial role in modern sensing and imaging applications. While high-performance monolithic linearly polarized photodetectors have been extensively studied, integrated circularly polarized light (CPL) photodetectors are still hindered by inadequate discrimination capability. This study presents a broadband CPL photodetector utilizing achiral all-dielectric nanostructures, achieving an impressive discrimination ratio of ~107 at a wavelength of 405 nm. Our device shows outstanding CPL discrimination capability across the visible band without requiring intensity calibration. It functions based on the CPL-dependent near-field modes within achiral structures: under left or right CPL illumination, distinct near-field modes are excited, resulting in asymmetric irradiation of the two electrodes and generating a photovoltage with directions determined by the chirality of the incident light field. The proposed design strategy facilitates ultra-compact CPL detection across diverse materials, structures, and spectral ranges, presenting a novel avenue for achieving high-performance monolithic CPL detection.
Source & review
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CPL-dependent near-field modes generate chirality-dependent photovoltage
Source PDF · page 1circular-polarization discrimination ratio about 107 at 405 nm
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Guanyu Zhang, Xiaying Lyu, Yulu Qin, Yaolong Li, Zipu Fan, Xianghan Meng, Yuqing Cheng, Zini Cao, Yixuan Xu, Dong Sun, Yunan Gao, Qihuang Gong, Guowei Lyu. High discrimination ratio, broadband circularly polarized light photodetector using dielectric achiral nanostructures. Light: Science & Applications (2024). https://doi.org/10.1038/s41377-024-01634-8
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