Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, and School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China
Abstract We investigated Goos-Hänchen (GH) and Imbert-Fedorov (IF) shifts of a reflective beam on a twisted bilayer of hexagonal boron nitride (hBN), where a left circularly polarized beam was incident on the surface. Our results demonstrate that the twist angle between the two optical axes plays an important role in obtaining large shifts with a high reflectivity. The GH shift with 10λ0 is achieved, while the reflectivity is near 100% by tuning the twist angle. The maximum of the IF shift is found in the certain condition satisfied by the reflective coefficients, and the shift strongly depends on the twist angle between the optical axes of the two slabs. The spatial shifts obtained directly from the GH and IF shift definitions were provided, which indicate that the theoretical results from the stationary phase method are believable. These results may open up a new way for developing the nano-optical devices.
Fund: Project supported by the Natural Science Foundation of Heilongjiang Province, China (Grant No. LH2020A014), Harbin Normal University Fund (Grant No. HSDSSCX2021-27), and Education Commission of Heilongjiang Province, China (Grant No. 2020-KYYWF352).
Corresponding Authors:
Shu-Fang Fu
E-mail: shufangfu1975@163.com
Cite this article:
Yu-Bo Li(李宇博), Hao-Yuan Song(宋浩元), Yu-Qi Zhang(张玉琦), Xiang-Guang Wang(王相光),Shu-Fang Fu(付淑芳), and Xuan-Zhang Wang(王选章) Tunable enhanced spatial shifts of reflective beam on the surface of a twisted bilayer of hBN 2022 Chin. Phys. B 31 064207
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