Active beam manipulation and convolution operation in VO2-integrated coding terahertz metasurfaces.
Opt Lett
; 47(2): 441-444, 2022 Jan 15.
Article
en En
| MEDLINE
| ID: mdl-35030627
ABSTRACT
Coding metasurfaces have received tremendous interest due to their unprecedented control of beams through the flexible design of coding sequences. However, realizing tunable coding metasurfaces with scattering-pattern shifts in the terahertz range is still challenging. Here, we propose a VO2-integrated coding metasurface to realize a thermally controlled scattering-pattern shift by convolution operation. The required phase profiles and high amplitudes of 1-bit and 2-bit coding metasurfaces are easily obtained only by changing the length of the VO2 cut-wires. The insulator-metal phase transition of the VO2 cut-wires leads to an ultrafast switching effect between multiple deflected scattering beams and one normally reflected beam. In particular, the VO2 phase transition contributes to dynamical convolution operations of the 2-bit coding metasurface. The proposed VO2-integrated coding metasurfaces are important for realizing tunable terahertz beam manipulation as well as arbitrary required scattering beams.
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Colección:
01-internacional
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MEDLINE
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En
Revista:
Opt Lett
Año:
2022
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Article