Full-visible transmissive metagratings with large angle/wavelength/polarization tolerance.
Nanoscale
; 12(40): 20604-20609, 2020 Oct 22.
Article
em En
| MEDLINE
| ID: mdl-33048100
ABSTRACT
Metagratings have been shown to form an agile and efficient platform for extreme wavefront manipulation, going beyond the limitations of gradient metasurfaces. Here, we present all-dielectric transmissive metagratings with high diffraction efficiencies using simple rectangular inclusions with neither high index nor high aspect ratio requirement. We further experimentally demonstrate continuous phase encoding of a hologram based on such transmissive metagratings through displacement modulation of CMOS-compatible silicon nitride nanobars in the full visible range, manifesting broadband and wide-angle high diffraction efficiencies for both polarizations. Featured with extreme angle/wavelength/polarization tolerance and alleviated structural complexity for both design and fabrication, our demonstration unlocks the full potential of metagrating-based wavefront manipulation for a variety of practical applications.
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MEDLINE
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En
Ano de publicação:
2020
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Article