Journal
OPTICS COMMUNICATIONS
Volume 487, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2021.126812
Keywords
Metasurface; Wavefront manipulation; Geometric phase; Lens; Vortex beam
Categories
Funding
- Natural Science Foundations of China [11704208]
- Key Research Project for Science and Technology of the Education Department of Henan Province, China [18A140006]
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Metasurfaces, composed of subwavelength optical phase shifters, operate in the ultraviolet range and achieve wavefront shaping functions. This research provides new insights into the development of ultraviolet metasurface-based nano-photonic devices.
Metasurfaces, planar arrays of subwavelength optical phase shifters, show unprecedented superiority to convention bulk optical elements in many applications. Until now, most of metasurfaces work at frequencies from the microwave to the visible; material challenges (lack of media supporting resonant responses at higher frequencies) have hampered the realization of controlling light at shorter wavelengths. However, for applications such as high-resolution imaging and high sensitive sensing, they require much higher photon energy to meet the requirement of higher resolution. Herein, using plasmonic effect of topological insulator (Bi1.5Sb0.5Te1.8Se1.2, BSTS), we numerically demonstrate that the metasurfaces, composed of BSTS spheroidal nanostructures, operate in the ultraviolet range. Some representative wavefront shaping functions, including anomalous refraction, lensing and optical vortices, are realized by means of geometric phase scheme. This research may inspire more interest in the development of ultraviolet metasurface-based nano-photonic devices with diverse functions such as holographic lithography, subwavelength resolution imaging and quantum information processing.
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