Simple terahertz vortex beam generator based on reflective metasurfaces.
Jiu-Sheng Li,Li-Na Zhang +1 more
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TLDR
Both theoretical prediction and simulated results verify that the designed metasurface can achieve a terahertz vortex wave beam with different OAM topological charges.Abstract:
Orbital angular momentum (OAM) is an effective way to increase wireless communication capacity. The existing OAM mainly focuses on the optical and microwave frequency domain. In this letter, a reflective metasurface is proposed to generate an OAM vortex wave beam in the terahertz region with different topological charges. Under illumination of a circular polarized wave, the proposed metasurface generates the deflected OAM vortex wave beam with topological charges of l=±1 and l=±2 at a wide terahertz band from 0.3THz to 0.45THz. The OAM beam has a high mode purity that is larger than 90% at 0.4THz. Both theoretical prediction and simulated results verify that the designed metasurface can achieve a terahertz vortex wave beam with different OAM topological charges.read more
Citations
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Broadband and thermally switchable reflective metasurface based on Z-shape InSb for terahertz vortex beam generation
TL;DR: In this paper , a broadband and thermally switchable reflective metasurface based on InSb Z-shape resonator (ZSR) structure was proposed for the vortex beam generation in terahertz (THz) region.
Journal ArticleDOI
Broadband transparent terahertz vortex beam generator based on thermally tunable geometric metasurface
TL;DR: In this paper, a transparent geometric metasurface composed of InSb cylindroid was proposed to generate vortex beams in terahertz region, which can achieve broadband coverage from 1.8 THz to 4.5 THz, with a fractional bandwidth of 85.7%.
Journal ArticleDOI
Ultra-broadband high-efficiency circular polarization conversion and terahertz wavefront manipulation based on an all-metallic reflective metasurface
TL;DR: In this paper , an all-metal metasurface (MS), which can achieve high-efficient reflective circular-polarization conversion and multifunctional terahertz (THz) wavefront manipulation in an ultra-broadband frequency range, is proposed and investigated theoretically.
Journal ArticleDOI
Terahertz Transmission‐Type Metasurface for the Linear and Circular Polarization Wavefront Manipulation
TL;DR: In this article , a transmission-type metasurface (MS) based on the combined geometric and transmission phase is proposed and investigated numerically, which can achieve independently manipulation of the circular polarization (CP) and linear polarization (LP) wavefront at terahertz (THz) region.
Journal ArticleDOI
Design of broadband terahertz vector and vortex beams: I. Review of materials and components
TL;DR: In this paper , the authors review the existing approaches for vortex and vector beam shaping and generation in the terahertz frequency range and propose a unified concept for constructing passive shapers of such beams from the existing component base.
References
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