High discrimination ratio,broadband circularly polarized light photodetector using dielectric achiral nanostructures  

作　　者：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 

机构地区：[1]State Key Laboratory for Mesoscopic Physics,Collaborative Innovation Center of Quantum Matter,Frontiers Science Center for Nano-Optoelectronics,School of Physics,Peking University,Beijing,China [2]International Center for Quantum Materials,School of Physics,Peking University,Beijing,China [3]School of Mathematics and Physics,University of Science and Technology Beijing,Beijing,China [4]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan,Shanxi,China [5]Peking University Yangtze Delta Institute of Optoelectronics,Nantong,Jiangsu,China

出　　处：《Light(Science & Applications)》2024年第11期2802-2811,共10页光（科学与应用)（英文版）

基　　金：supported by the Guangdong Major Project of Basic and Applied Basic Research(Grant No.2020B0301030009);the National Key Research and Development Program of China(Grant No.2022YFA1604304);the National Natural Science Foundation of China(Grant No.92250305).

摘　　要：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.

关 键 词：polarization POLARIZED DIELECTRIC 

分 类 号：TN2[电子电信—物理电子学]