Asymmetrical photonic spin Hall effect based on dielectric metasurfaces

doi:10.1088/1674-1056/ac754b

中国物理B ›› 2022, Vol. 31 ›› Issue (12): 124207-124207.doi: 10.1088/1674-1056/ac754b

Asymmetrical photonic spin Hall effect based on dielectric metasurfaces

Guangzhou Geng(耿广州)¹, Ruhao Pan(潘如豪)¹, Wei Zhu(朱维)^2,†, and Junjie Li(李俊杰)^1,‡

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, China

收稿日期:2022-05-09 修回日期:2022-05-31 接受日期:2022-06-02 出版日期:2022-11-11 发布日期:2022-11-28
通讯作者: Wei Zhu, Junjie Li E-mail:zhuwei@wtu.edu.cn;jjli@iphy.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12074420, U21A20140, and 61905274), the Beijing Municipal Science & Technology Commission, Administrative Commission of Zhongguancun Science Park (Grant No. Z211100004821009), the Chinese Academy of Sciences through the Project for Young Scientists in Basic Research (Grant No. YSBR-021), and the Synergic Extreme Condition User Facility.

Asymmetrical photonic spin Hall effect based on dielectric metasurfaces

Guangzhou Geng(耿广州)¹, Ruhao Pan(潘如豪)¹, Wei Zhu(朱维)^2,†, and Junjie Li(李俊杰)^1,‡

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan 430200, China

Received:2022-05-09 Revised:2022-05-31 Accepted:2022-06-02 Online:2022-11-11 Published:2022-11-28
Contact: Wei Zhu, Junjie Li E-mail:zhuwei@wtu.edu.cn;jjli@iphy.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12074420, U21A20140, and 61905274), the Beijing Municipal Science & Technology Commission, Administrative Commission of Zhongguancun Science Park (Grant No. Z211100004821009), the Chinese Academy of Sciences through the Project for Young Scientists in Basic Research (Grant No. YSBR-021), and the Synergic Extreme Condition User Facility.

摘要/Abstract

摘要： The photonic spin Hall effect has attracted considerable research interest due to its potential applications in spin-controlled nanophotonic devices. However, realization of the asymmetrical photonic spin Hall effect with a single optical element is still a challenge due to the conjugation of the Pancharatnam-Berry phase, which reduces the flexibility in various applications. Here, we demonstrate an asymmetrical spin-dependent beam splitter based on a single-layer dielectric metasurface exhibiting strong and controllable optical response. The metasurface consists of an array of dielectric nanofins, where both varying rotation angles and feature sizes of the unit cells are utilized to create high-efficiency dielectric metasurfaces, which enables to break the conjugated characteristic of phase gradient. Thanks to the superiority of the phase modulation ability, when the fabricated metasurface is under normal incidence with a wavelength of 1550 nm, the left-handed circular polarization (LCP) light exhibits an anomalous refraction angle of 28.9°, while the right-handed circular polarization (RCP) light transmits directly. The method we proposed can be used for the flexible manipulation of spin photons and has potentials in high efficiency metasurfaces with versatile functionalities, especially with metasurfaces in a compact space.

关键词: dielectric metasurface, photonic spin Hall effect, asymmetrical optical response

Abstract: The photonic spin Hall effect has attracted considerable research interest due to its potential applications in spin-controlled nanophotonic devices. However, realization of the asymmetrical photonic spin Hall effect with a single optical element is still a challenge due to the conjugation of the Pancharatnam-Berry phase, which reduces the flexibility in various applications. Here, we demonstrate an asymmetrical spin-dependent beam splitter based on a single-layer dielectric metasurface exhibiting strong and controllable optical response. The metasurface consists of an array of dielectric nanofins, where both varying rotation angles and feature sizes of the unit cells are utilized to create high-efficiency dielectric metasurfaces, which enables to break the conjugated characteristic of phase gradient. Thanks to the superiority of the phase modulation ability, when the fabricated metasurface is under normal incidence with a wavelength of 1550 nm, the left-handed circular polarization (LCP) light exhibits an anomalous refraction angle of 28.9°, while the right-handed circular polarization (RCP) light transmits directly. The method we proposed can be used for the flexible manipulation of spin photons and has potentials in high efficiency metasurfaces with versatile functionalities, especially with metasurfaces in a compact space.

Key words: dielectric metasurface, photonic spin Hall effect, asymmetrical optical response

中图分类号: (Reflectors, beam splitters, and deflectors)

42.79.Fm

42.79.Hp (Optical processors, correlators, and modulators) 78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)

Guangzhou Geng(耿广州), Ruhao Pan(潘如豪), Wei Zhu(朱维), and Junjie Li(李俊杰). Asymmetrical photonic spin Hall effect based on dielectric metasurfaces[J]. 中国物理B, 2022, 31(12): 124207-124207.

Guangzhou Geng(耿广州), Ruhao Pan(潘如豪), Wei Zhu(朱维), and Junjie Li(李俊杰). Asymmetrical photonic spin Hall effect based on dielectric metasurfaces[J]. Chin. Phys. B, 2022, 31(12): 124207-124207.

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Asymmetrical photonic spin Hall effect based on dielectric metasurfaces

Asymmetrical photonic spin Hall effect based on dielectric metasurfaces

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