Terahertz generation of Airy beam with polarization conversion in a reflective vanadium dioxide metasurface

Airy beam possesses a wide range of applications owing to its special properties of non-diffraction, self-accelerating, and self-healing. However, conventional Airy beam generators are not conducive to their miniaturization or integration. In this paper, a technique for generating Airy beam is intro...

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Bibliographic Details
Published in:Physica scripta 2024-05, Vol.99 (5), p.55555
Main Authors: Zhou, Zhesheng, Zhang, Runxuan, Chen, Zijun, Nie, Ruixing, Pan, Zimo, Song, Zhengyong
Format: Article
Language:English
Subjects:
Airy beam
metasurface
vanadium dioxide
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Summary:Airy beam possesses a wide range of applications owing to its special properties of non-diffraction, self-accelerating, and self-healing. However, conventional Airy beam generators are not conducive to their miniaturization or integration. In this paper, a technique for generating Airy beam is introduced with polarization conversion within the frequency range of 0.9–1.2 THz based on a reflective vanadium dioxide (VO 2 ) metasurface. Our design is composed of VO 2 elliptical patch, SiO 2 spacer, and gold substrate. When the metallic VO 2 is involved, the proposed metasurface can efficiently generate cross-polarized Airy beam since amplitude and phase distributions of reflected wave are modulated simultaneously by rotating tilt angle of each VO 2 patch. Conversely, when the insulating VO 2 is involved, the metasurface does not generate Airy beam. In addition, we demonstrate broadband effect and autofocusing phenomenon of the metasurface. The proposed Airy beam generator may be of great interest for beam shaping, biomedical imaging, and laser fabrication.
ISSN:0031-8949
1402-4896
DOI:10.1088/1402-4896/ad3ee8