jiaoyan Guo, Wenyu Li, Ran Sun, Guozhong Zhao. Generation of Broadband Terahertz Vortex Beam Based on Double-Arrow Metasurface[J]. Chinese Journal of Lasers, 2021, 48(20): 2014003
- Chinese Journal of Lasers
- Vol. 48, Issue 20, 2014003 (2021)
Fig. 1. Element structures before and after rotating θ angle in Cartesian coordinate system
Fig. 2. Structural diagram of single-layer double-arrow unit. (a) Top view; (b) side view
Fig. 3. Reflection amplitudes and reflection phases at different frequencies. (a) Reflection amplitudes; (b) reflection phases
Fig. 4. Reflection amplitudes and reflection phases of different incident circular polarized light. (a) (b) Left-handed incident circular polarized light; (c) (d) right-handed incident circular polarized light
Fig. 5. Reflective metasurfaces based on single-layer double-arrow element structure at different topological charges. (a) l=1; (b) l=2
Fig. 6. Reflection phases and reflection amplitudes of vortex beams generated by metasurface at different frequencies when l=1
Fig. 7. Reflection phases and reflection amplitudes of vortex beams generated by metasurface at different transmission distances when l=2
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