Ultrafast reprogrammable multifunctional vanadium-dioxide-assisted metasurface for dynamic THz wavefront engineering

被引:111
作者
Shabanpour, Javad [1 ]
Beyraghi, Sina [1 ]
Cheldavi, Ahmad [1 ]
机构
[1] Iran Univ Sci & Technol, Dept Elect Engn, Tehran 1648613114, Iran
关键词
ORBITAL ANGULAR-MOMENTUM; PHASE-TRANSITION; THIN-FILMS; BROAD-BAND; TERAHERTZ SPECTROSCOPY; METAL TRANSITION; VORTEX BEAMS; METAMATERIAL; POLARIZATION; ABSORPTION;
D O I
10.1038/s41598-020-65533-9
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In this paper, for the first time, a new generation of ultrafast reprogrammable multi-mission bias encoded metasurface is proposed for dynamic terahertz wavefront engineering by employing VO2 reversible and fast monoclinic to tetragonal phase transition. The multi-functionality of our designed VO2 based coding metasurface (VBCM) was guaranteed by elaborately designed meta-atom comprising three-patterned VO2 thin films whose operational statuses can be dynamically tuned among four states of "00"-"11" by merely changing the biasing voltage controlled by an external Field-programmable gate array platform. Capitalizing on such meta-atom design and by driving VBCM with different spiral-like and spiral-parabola-like coding sequences, single vortex beam and focused vortex beam with interchangeable orbital angular momentum modes were satisfactorily generated respectively. Additionally, by adopting superposition theorem and convolution operation, symmetric/asymmetric multiple beams and arbitrarily-oriented multiple vortex beams in pre-demined directions with different topological charges are realized. Several illustrative examples successfully have clarified that the proposed VBCM is a promising candidate for solving crucial terahertz challenges such as high data rate wireless communication where ultrafast switching between several missions is required.
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页数:14
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