Photonics Research, 2017, 5 (6): 06000684, Published Online: Dec. 7, 2017  

Tunable spin splitting of Laguerre–Gaussian beams in graphene metamaterials Download: 728次

Author Affiliations
1 Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Jinan University, Guangzhou 510632, China
2 Department of Optoelectronic Engineering, Jinan University, Guangzhou 510632, China
3 e-mail: zhuwg88@163.com
4 Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China
5 e-mail: ttguanheyuan@jnu.edu.cn
Abstract
Optical spin splitting has attracted significant attention owing to its potential applications in quantum information and precision metrology. However, it is typically small and cannot be controlled efficiently. Here, we enhance the spin splitting by transmitting higher-order Laguerre–Gaussian (LG) beams through graphene metamaterial slabs. The interaction between LG beams and metamaterial results in an orbital-angular-momentum- (OAM) dependent spin splitting. The upper bound of the OAM-dependent spin splitting is found, which varies with the incident OAM and beam waist. Moreover, the spin splitting can be flexibly tuned by modulating the Fermi energy of the graphene sheets. This tunable spin splitting has potential applications in the development of spin-based applications and the manipulation of mid-infrared waves.

Wenguo Zhu, Mengjiang Jiang, Heyuan Guan, Jianhui Yu, Huihui Lu, Jun Zhang, Zhe Chen. Tunable spin splitting of Laguerre–Gaussian beams in graphene metamaterials[J]. Photonics Research, 2017, 5(6): 06000684.

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