High quality factor metasurfaces for dynamic, electro-optically controlled wavefront shaping

Elissa Klopfer; Sahil Dagli; David Barton; Mark Lawrence; Jen A. Dionne

doi:10.1117/12.2594218

1 August 2021 High quality factor metasurfaces for dynamic, electro-optically controlled wavefront shaping

Elissa Klopfer, Sahil Dagli, David Barton, Mark Lawrence, Jen A. Dionne

Proceedings Volume 11796, Active Photonic Platforms XIII; 117960W (2021) https://doi.org/10.1117/12.2594218
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

Abstract

Here we present high quality factor (high-Q) metasurfaces as a new platform for continuous, electro-optical reconfigurability. Using full-field simulations, we show how applying a voltage across individual nanoantenna shifts the spectral position of the high-Q resonance, modifying the antenna phase and amplitude, and achieving a full 2 pi phase variation with reflectance above 93%. We next computationally design a modulatable beam steerer; without bias light is directly reflected from the metasurface, whereas with applied biases of +9.2, 0, and -9.2 V across three constituent antennas the light is diffracted to 30 deg with 65% efficiency. Biases of 13, 2, -2, and -13 V across 4 constituent antennas diffract to 22 deg. Our presentation will discuss not only the design but also fabrication and characterization en route to a versatile metasurface platform that can reconfigurably achieve a variety of transfer functions.

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Citation Download Citation

Elissa Klopfer, Sahil Dagli, David Barton, Mark Lawrence, and Jen A. Dionne "High quality factor metasurfaces for dynamic, electro-optically controlled wavefront shaping", Proc. SPIE 11796, Active Photonic Platforms XIII, 117960W (1 August 2021); https://doi.org/10.1117/12.2594218

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KEYWORDS

Electro optics

Wavefronts

Antennas

Lithium niobate

Modulation

LIDAR

Light-matter interactions

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