Extreme Metaphotonics with Ultra High-Index Topological Insulators

Sukanta Nandi; Danveer Singh; Shany Zrihan Cohen; Tomer Lewi

doi:10.1364/CLEO_FS.2023.FF1D.7

CLEO 2023
Technical Digest Series (Optica Publishing Group, 2023),
paper FF1D.7
•https://doi.org/10.1364/CLEO_FS.2023.FF1D.7

Extreme Metaphotonics with Ultra High-Index Topological Insulators

Sukanta Nandi, Danveer Singh, Shany Zrihan Cohen, and Tomer Lewi

CLEO: Fundamental Science 2023

San Jose, CA United States
7–12 May 2023
ISBN: 978-1-957171-25-8

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Topological Metaoptics (FF1D)

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S. Nandi, D. Singh, S. Z. Cohen, and T. Lewi, "Extreme Metaphotonics with Ultra High-Index Topological Insulators," in CLEO 2023, Technical Digest Series (Optica Publishing Group, 2023), paper FF1D.7.

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Abstract

We experimentally measure the complex dielectric constant of Bi₂Se₃ and Bi₂Te₃ topological insulators, revealing record high refractive index values peaking at n≈11. We further demonstrate deep-subwavelength metasurfaces with unit cell sizes smaller than λ/10, that simultaneously support large magnetic and electric field enhancements.

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