AI Article Synopsis
- A programmable vanadium dioxide (VO) metasurface operates at THz frequencies, allowing the switching between insulating and metallic states through electrical stimulation, which changes its electromagnetic responses.
- By controlling voltages via a field-programmable gate array, phase gradients are achieved for THz beam steering, enabling wide-angle beam scanning between -60° and +60° using periodic and nonperiodic coding sequences.
- Using 2-bit coding with two different meta-atoms enhances optical phase control compared to 1-bit coding, improving diffraction efficiency and offering a valuable tool for 6G wireless communication.
Article Abstract
Programmable vanadium dioxide (VO) metasurface is proposed at THz frequencies. The insulating and metallic states of VO can be switched via external electrical stimulation, resulting in the dynamical modulation of electromagnetic response. The voltages of different columns of the metasurface can be controlled by the field-programmable gate array, and thus the phase gradients are realized for THz beam steering. In 1-bit coding, we design periodic and nonperiodic 24 × 24 coding sequences, and achieve wide-angle beam scanning with the deflection angles from -60° to +60°. In 2-bit coding, we use two different meta-atoms to design 18 × 18 coding sequences. Compared with 1-bit coding, 2-bit coding has more degree of freedom to control the optical phase, and 3 dB diffraction efficiency is improved by generating a single deflection angle. The proposed programmable metasurfaces provide a promising platform for manipulating electromagnetic wave in 6G wireless communication.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9382261 | PMC |
| http://dx.doi.org/10.1016/j.isci.2022.104824 | DOI Listing |
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