Abstract
Stabilization issue of anomalous refraction and reflection in V-shaped antenna metasurfaces are investigated. Specifically, when a V-shaped metasurface is artificially tilted, the induced refraction and reflection are theoretically analyzed. Detailed numerical and experimental study is then performed for the upward and downward bending metasurfaces. Our results show that although the anomalous reflection is sensitive to the deformation of metasurface geometry; the anomalous refraction is, surprisingly, barely affected by relatively small-angle tilting and able to support perfect beam orienting. Since in real-world applications, the optical objects are often affected by multiple uncertain factors, such as deformation, vibration, non-standard surface, non-perfect planar, etc., the stabilization of optical functionality has therefore been a long-standing design challenge for optical engineering. We believe our findings can shed new light on this stability issue.
Highlights
Metasurface has attracted a lot of attentions due to its gorgeous performances and ultrathin thickness compared to conventional bulk optical components[1,2,3]
A metasurface consists of arrays of plasmonic antennas with linear gradient phase can generate anomalous reflection and refraction which is in agreement with generalized Snell’s laws derived from Fermat’s principle
To investigate the stabilization of the metasurface’s optical characteristics, we first analyze the impact on the anomalous refraction and reflection when the metasurface is artificially tilted
Summary
Metasurface has attracted a lot of attentions due to its gorgeous performances and ultrathin thickness compared to conventional bulk optical components[1,2,3]. In specific, when a polarized wave is incident on the metasurface antennas, both antenna modes can be excited but with substantially different amplitude and phase caused by their distinctive resonance conditions, anomalous cross-polarized scattered light are produced Based on these exotic properties, various metasurface-based optical devices including flat lens[7,8,9,10], beam reflectors[11,12], wave plates[13,14], vortex generators[15,16,17], meta-deflectors[18], holograms[19,20,21] and other novel, high-performance versatile photonic metadevices[22,23] have been studied. The anomalous refraction is, surprisingly, barely affected by relatively small-angle tilting or bending and able to support perfect beam orienting
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