期刊
2022 PHOTONICS & ELECTROMAGNETICS RESEARCH SYMPOSIUM (PIERS 2022)
卷 -, 期 -, 页码 563-567出版社
IEEE
DOI: 10.1109/PIERS55526.2022.9792937
关键词
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资金
- National Natural Science Foundation of China (NNSFC) [61625502, 11961141010, 61975176]
- Top-Notch Young Talents Program of China
- Fundamental Research Funds for the Central Universities
This paper introduces a chiral coding metamirror constructed with optically transparent material to generate multiple vortex beams in different directions. The metamirror has near-perfect spin-selective absorption and can selectively generate multiple vortex beams at a designated frequency.
With the growing channel demand in the interactive communication system, vortex beam with multi directions is of vital importance for high-efficiency communication. A chiral coding metamirror constructed with optically transparent material is proposed here to generate vortex beams carrying different topological charges in different directions. Dispersionless phase diagram covering 360 degrees is achieved based on the theory of Pancharatnam-Berry phase. The proposed metamirror unit has circular dichroism (CD) with near-perfect spin-selective absorption across a wideband and is insensitive to incident angle. Multi vortex beams can thus be selectively generated at the designated frequency, which avoid information interference. In addition, vortex beams with direction control are realized based on phase gradient mechanism.
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