Transmission type dual-frequency vortex beams generator for multiple OAM modes

We design a transmission-type metasurface to generate terahertz dual-frequency orbital angular momentum (OAM) vortex beams with different topological charges ( l  = 1, l  = 2) at frequency of 0.81THz and 1.63THz. By adding a deflection factor, the proposed metasurface produces a OAM vortex beam with...

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Bibliographic Details
Published in:Optical and quantum electronics 2022-04, Vol.54 (4), Article 209
Main Authors: Lei, Zhang, Jiu-sheng, Li
Format: Article
Language:English
Subjects:
Angular momentum
Characterization and Evaluation of Materials
Communications systems
Computer Communication Networks
Electrical Engineering
Electron beams
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Terahertz frequencies
Topology
Vortices
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Summary:We design a transmission-type metasurface to generate terahertz dual-frequency orbital angular momentum (OAM) vortex beams with different topological charges ( l  = 1, l  = 2) at frequency of 0.81THz and 1.63THz. By adding a deflection factor, the proposed metasurface produces a OAM vortex beam with a preset tilted direction at two frequencies. By utilizing a complex convolution operation, we can achieve two symmetric tilted beams with different topological charges ( l  = 1, l  = − 1) at two frequencies on the same metasurface. These OAM vortex beams can effectively improve communication system capacity, and have potential applications in terahertz communication.
ISSN:0306-8919
1572-817X
DOI:10.1007/s11082-022-03589-9