Electrically Tunable Reflective Metasurfaces with Continuous and Full-Phase Modulation for High-Efficiency Wavefront Control at Visible Frequencies

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Electrically Tunable Reflective Metasurfaces with Continuous and Full-Phase Modulation for High-Efficiency Wavefront Control at Visible Frequencies
Title:
Electrically Tunable Reflective Metasurfaces with Continuous and Full-Phase Modulation for High-Efficiency Wavefront Control at Visible Frequencies
Journal Title:
ACS Nano
Keywords:
Publication Date:
16 August 2023
Citation:
Moitra, P., Xu, X., Maruthiyodan Veetil, R., Liang, X., Mass, T. W. W., Kuznetsov, A. I., & Paniagua-Domínguez, R. (2023). Electrically Tunable Reflective Metasurfaces with Continuous and Full-Phase Modulation for High-Efficiency Wavefront Control at Visible Frequencies. ACS Nano, 17(17), 16952–16959. https://doi.org/10.1021/acsnano.3c04071
Abstract:
All-dielectric optical metasurfaces can locally control the amplitude and phase of light at the nanoscale, enabling arbitrary wavefront shaping. However, the lack of post-fabrication tunability has limited the true potential of metasurfaces for many applications. Here, we utilize a thin liquid crystal (LC) layer as a tunable medium surrounding the metasurface to achieve a phase-only spatial light modulator (SLM) with high reflection in the visible frequency, exhibiting an active and continuous resonance tuning with associated 2π phase control and uncoupled amplitude. The reduced LC thickness facilitates achieving a small pixel size, strongly suppressing crosstalk among pixels. Dynamic wavefront shaping is demonstrated by programming 96 individually addressable electrodes with a pixel pitch of ~1 μm. This device is used to demonstrate dynamic beam steering with a wide field of view and high absolute diffraction efficiencies. We believe that our demonstration may pave the way towards realizing next-generation, high-resolution SLMs, with wide applications in dynamic holography, tunable optics and light detection and ranging (LiDAR), to mention a few.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the A*STAR - AME Programmatic
Grant Reference no. : A18A7b0058

This research / project is supported by the National Research Foundation - NRF Investigatorship
Grant Reference no. : NRF-NRFI2017-01

IET A F Harvey Engineering Research Prize 2016
Description:
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see doi.org/10.1021/acsnano.3c04071
ISSN:
1936-086X
1936-0851
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