期刊
OPTICS LETTERS
卷 45, 期 21, 页码 6054-6057出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.401231
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资金
- National Laboratory of Solid State Microstructures, Nanjing University [M32056]
- China Postdoctoral Science Foundation [2017M611693, 2018T110440]
- Intergovernmental Science and Technology Regular Meeting Exchange Project of Ministry of Science and Technology of China [CB02-20]
- National Natural Science Foundation of China [11811530052, 11947028]
Generating a vortex beam is a fundamental task due to the potential applications in wireless communication. Here we propose a kind of high-performance terahertz vortex beam generator with several topological numbers based on the square-split-ring metasurfaces. Via the Fabry-Perot resonance effect of the structure, the transmittance of an orthogonal polarization mode could be remarkably enhanced. We use a Laguerre-Gaussian (LG) mode for illustration and then simulate the far-field propagation of the LG beam by using phase superposition of focusing lens and vortex phase plates. The theoretical and simulation results agree well, which implies a bright application prospect. (C) 2020 Optical Society of America
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