Dielectric Fourier metasurfaces as wide-angle Y-junction switches

Dielectric Fourier metasurfaces—thin layers of strongly refracting transparent materials with periodic surface nanoreliefs—are capable of versatile flat-optical functionalities, including anomalous refraction in up to near-grazing directions. Describing the reliefs by a few Fourier coefficients, one...

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Bibliographic Details
Published in:Journal of optics (2010) 2021-12, Vol.23 (12), p.125103
Main Authors: Antonov, Alexander A, Gorkunov, Maxim V
Format: Article
Language:English
Subjects:
anomalous refraction
dielectric metasurface
Fourier metasurface
Y-junction switch
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Summary:Dielectric Fourier metasurfaces—thin layers of strongly refracting transparent materials with periodic surface nanoreliefs—are capable of versatile flat-optical functionalities, including anomalous refraction in up to near-grazing directions. Describing the reliefs by a few Fourier coefficients, one can straightforwardly optimize them numerically or, eventually, analytically in terms of the Rayleigh hypothesis. We demonstrate that silicon Fourier metasurfaces supporting anomalous refraction in near-grazing directions can be employed as efficient optical Y-junction switches. Operating in the vicinity of a certain diffraction order cutoff, they can drastically alter the direction of outgoing light due to subtle variations of the optical setup. As examples, we show the possibility to deflect 70%–80% of the power of green light by more than 150 degrees when the incoming beam is inclined by only 2 degrees, or when the relative substrate permittivity is varied by 0.1. We also evaluate the prospects of metasurfaces made of other weaker-refracting transparent materials.
ISSN:2040-8978
2040-8986
DOI:10.1088/2040-8986/ac3298