Photonic spin Hall effect of monolayer black phosphorus in the Terahertz region

Nanophotonics

article

Hai Lin¹  Zhe Chen²  Binguo Chen³  Songqing Yang²  Wenguo Zhu¹  Jianhui Yu¹  Heyuan Guan³  Huihui Lu³  Yunhan Luo³ 

[1] Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Jinan University;Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Educational Institutes, Jinan University;Department of Optoelectronic Engineering, Jinan University

关键词: black phosphorus;    photonic spin Hall effect;    in-plane anisotropy;    two-dimensional material;   

DOI  :  10.1515/nanoph-2018-0101

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

As a two-dimensional (2D) material, black phosphorus (BP) has attracted significant attention owing to exotic physical properties such as low-energy band gap, high carrier mobility, and strong in-plane anisotropy. The striking in-plane anisotropy is a promising candidate for novel light-matter interaction. Here, we investigate the photonic spin Hall effect (PSHE) on a monolayer of BP. Due to the in-plane anisotropic property of BP, the PSHE is accompanied with Goos-Hänchen and Imbert-Fedorov effects, resulting in an asymmetric spin splitting. The asymmetric spin splitting can be flexibly tuned by the angle between the incident plane and the armchair crystalline direction of BP and by the carrier density via a bias voltage. The centroid displacements of two opposite spin components of the reflected beam along directions parallel and perpendicular to the incident plane can be considered as four independent channels for information processing. The potential application in barcode-encryption is proposed and discussed. These findings provide a deeper insight into the spin-orbit interaction in 2D material and thereby facilitate the development of optoelectronic devices in the Terahertz region.

【 授权许可】

CC BY