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Issue 40, 2020
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Full-visible transmissive metagratings with large angle/wavelength/polarization tolerance

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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.

Graphical abstract: Full-visible transmissive metagratings with large angle/wavelength/polarization tolerance

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Article information


Submitted
04 Aug 2020
Accepted
18 Sep 2020
First published
19 Sep 2020

Nanoscale, 2020,12, 20604-20609
Article type
Communication

Full-visible transmissive metagratings with large angle/wavelength/polarization tolerance

Z. Deng, X. Ye, H. Qiu, Q. Tu, T. Shi, Z. Zhuang, Y. Cao, B. Guan, N. Feng, G. P. Wang, P. Kapitanova, A. Alù, J. Dong and X. Li, Nanoscale, 2020, 12, 20604
DOI: 10.1039/D0NR05745B

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