https://doi.org/10.1140/epjp/s13360-024-05711-0
Regular Article
Tunable spatial shifts of reflected beam from a polar crystal film sandwiched by dual-twisted black phosphorus gratings
1
Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, 150025, Harbin, China
2
Department of Basic Courses, Guangzhou Maritime University, 510725, Guangzhou, China
Received:
5
February
2024
Accepted:
2
October
2024
Published online:
15
October
2024
A novel layered structure, a polar-crystal film coated with dual-twisted black phosphorus (BP) gratings, is proposed to enhance GH- and IF-shifts. Taking ZnS as the polar crystal, our investigation shows that the optimized BP grating-ZnS-BP grating structure can increase the GH- and IF-shifts to nearly half of the beam waist in the near-infrared frequency region. It is very interesting that the sign of IF-shift can be switched by simply inverting the dual-twisted BP gratings without altering its amplitude. These phenomena result from the distinct interactions between the surface plasmon polaritons in the dual-twisted BP gratings and surface phonon polaritons in the polar crystals. The distribution of electric field is simulated by the commercial software Comsol Multiphysics, which offers additional support to the conclusions. The incident-angle and rotation-angle dependence of the GH- and IF-shifts are also examined. Our work provides a framework, a polar crystal film interlayered in the dual-twisted gratings, to adjust and improve the GH- and IF-shifts.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
