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9 March 2020 Liquid crystal tunable dielectric metasurfaces via inverse design (Conference Presentation)
Haejun Chung, Owen Miller
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Proceedings Volume 11274, Physics and Simulation of Optoelectronic Devices XXVIII; 112741F (2020) https://doi.org/10.1117/12.2542856
Event: SPIE OPTO, 2020, San Francisco, California, United States
Abstract
Electrically tunable optical metasurfaces based on Liquid Crystal (LC) offer fast switching speed, low cost, and mature technological development, making it highly desirable for these applications. However, to date, all electrically tunable metasurfaces are designed at a single phase using physical intuition, without controlling the alternate phase and thus leading to limited switching efficiencies (~30 %) and small angular steering (15 degrees). Here, we use adjoint-based “inverse design” (equivalent to “backpropagation” in deep learning) to discover tunable metasurfaces with state-of-the-art efficiency (>80 %) and wide-angle steering (144 degrees). Inverse design can efficiently compute sensitivities with respect to arbitrarily many geometrical degrees of freedom, and thus is very effective for optimizing complicated photonic devices.
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Haejun Chung and Owen Miller "Liquid crystal tunable dielectric metasurfaces via inverse design (Conference Presentation)", Proc. SPIE 11274, Physics and Simulation of Optoelectronic Devices XXVIII, 112741F (9 March 2020); https://doi.org/10.1117/12.2542856
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KEYWORDS
Liquid crystals
Dielectrics
Switching
Fast packet switching
Photonic devices
Physics
Ranging
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