https://doi.org/10.1140/epjd/s10053-025-00998-9
Regular Article - Optical Phenomena and Photonics
Large-angle directional scattering of terahertz beams based on all-dielectric metasurface
1
Special Equipment Institute, Hangzhou Vocational and Technical College, 310018, Hangzhou, China
2
Jiaxing Nanhu University, Jiaxing, People’s Republic of China
3
Geely Automotive Institute, Hangzhou Vocational and Technical College, 310018, Hangzhou, China
4
Zhejiang Institute of Economics and Trade, 310018, Hangzhou, China
5
Institute of Optoelectronic Technology, China Jiliang University, 310018, Hangzhou, China
Received:
29
October
2024
Accepted:
4
April
2025
Published online:
6
May
2025
The traditional terahertz metasurface beam deflector has low efficiency with large exit angle, which limited its use. To improve splitting angle, a terahertz large-angle transmission metagrating is proposed. The grating unit is composed of asymmetric waveguides, and the unidirectional scattering direction can be precisely tuned by the height of waveguides. More intuitively, it is a grating that directly adjusts the distribution of light energy without depending on the phase. Multiple modes in the structure are excited by the incident light, and the interference of the modes leads to periodic energy jumps. In addition, S-shaped energy flow can well explain the principle of scattering with larger angle. The simulation results show that most incident energy enters the -1 order diffraction in range 0.52–0.6THz. The diffraction efficiency is close to 0.8 when the deflection angle is 68°.
Copyright comment 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.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2025
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.
