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Download fileHigh-Quality-Factor Silicon-on-Lithium Niobate Metasurfaces for Electro-optically Reconfigurable Wavefront Shaping
journal contribution
posted on 2022-02-03, 16:03 authored by Elissa Klopfer, Sahil Dagli, David Barton, Mark Lawrence, Jennifer A. DionneDynamically reconfigurable metasurfaces
promise compact and lightweight
spatial light modulation for many applications, including LiDAR, AR/VR,
and LiFi systems. Here, we design and computationally investigate
high-quality-factor silicon-on-lithium niobate metasurfaces with electrically
driven, independent control of its constituent nanobars for full phase
tunability with high tuning efficiency. Free-space light couples to
guided modes within each nanobar via periodic perturbations, generating
quality factors exceeding 30,000 while maintaining a bar spacing of <λ/1.5. We achieve
nearly 2π phase variation with an applied bias not exceeding
±25 V, maintaining a reflection efficiency above 91%. Using full-field
simulations, we demonstrate a high-angle (51°) switchable beamsplitter
with a diffracted efficiency of 93% and an angle-tunable beamsteerer,
spanning 18–31°, with up to 86% efficiency, all using
the same metasurface device. Our platform provides a foundation for
highly efficient wavefront-shaping devices with a wide dynamic tuning
range capable of generating nearly any transfer function.
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Keywords
space light coupleslithium niobate metasurfaceshighly efficient wavefrontguided modes withinfull phase tunabilitycomputationally investigate highhigh tuning efficiencyusing fulltunable beamsteerertransfer functionshaping devicesreflection efficiencyplatform providesmetasurface devicemany applicationslifi systemsindependent controlincluding lidargenerating nearlyfield simulationsfactor siliconelectrically drivendiffracted efficiencyconstituent nanobarsbar spacingapplied bias91 %.