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Infrared dielectric metamaterials from high refractive index chalcogenides

Infrared dielectric metamaterials from high refractive index chalcogenides
Infrared dielectric metamaterials from high refractive index chalcogenides
High-index dielectric materials are in great demand for nanophotonic devices and applications, from ultrathin optical elements to metal-free sub-diffraction light confinement and waveguiding. Here we show that chalcogenide topological insulators are particularly apt candidates for dielectric nanophotonics architectures in the infrared spectral range, by reporting metamaterial resonances in chalcogenide crystals sustained well inside the mid-infrared, choosing Bi2Te3 as case study within this family of materials. Strong resonant modulation of the incident electromagnetic field is achieved thanks to the exceptionally high refractive index ranging between 7 and 8 throughout the 2–10 μm region. Analysis of the complex mode structure in the metamaterial allude to the excitation of circular surface currents which could open pathways for enhanced light-matter interaction and low-loss plasmonic configurations by coupling to the spin-polarized topological surface carriers, thereby providing new opportunities to combine dielectric, plasmonic and magnetic metamaterials in a single platform.
2041-1723
Krishnamoorthy, H.N.S.
2073dc90-c3d3-43f0-a5dc-9a6bf1ac824a
Adamo, Giorgio
86d0005c-dd15-4d1d-8116-4aa9241b2602
Yin, J
a669f084-580a-49b4-93e9-5c1c61514ef0
Savinov, Vassili
147c7954-4636-4438-a305-cd78539f7c0a
Zheludev, Nikolai
32fb6af7-97e4-4d11-bca6-805745e40cc6
Soci, Cesare
6c86324e-2968-4e90-9436-4a92a4b26cec
Krishnamoorthy, H.N.S.
2073dc90-c3d3-43f0-a5dc-9a6bf1ac824a
Adamo, Giorgio
86d0005c-dd15-4d1d-8116-4aa9241b2602
Yin, J
a669f084-580a-49b4-93e9-5c1c61514ef0
Savinov, Vassili
147c7954-4636-4438-a305-cd78539f7c0a
Zheludev, Nikolai
32fb6af7-97e4-4d11-bca6-805745e40cc6
Soci, Cesare
6c86324e-2968-4e90-9436-4a92a4b26cec

Krishnamoorthy, H.N.S., Adamo, Giorgio, Yin, J, Savinov, Vassili, Zheludev, Nikolai and Soci, Cesare (2020) Infrared dielectric metamaterials from high refractive index chalcogenides. Nature Communications, 11 (1), [1692]. (doi:10.1038/s41467-020-15444-0).

Record type: Article

Abstract

High-index dielectric materials are in great demand for nanophotonic devices and applications, from ultrathin optical elements to metal-free sub-diffraction light confinement and waveguiding. Here we show that chalcogenide topological insulators are particularly apt candidates for dielectric nanophotonics architectures in the infrared spectral range, by reporting metamaterial resonances in chalcogenide crystals sustained well inside the mid-infrared, choosing Bi2Te3 as case study within this family of materials. Strong resonant modulation of the incident electromagnetic field is achieved thanks to the exceptionally high refractive index ranging between 7 and 8 throughout the 2–10 μm region. Analysis of the complex mode structure in the metamaterial allude to the excitation of circular surface currents which could open pathways for enhanced light-matter interaction and low-loss plasmonic configurations by coupling to the spin-polarized topological surface carriers, thereby providing new opportunities to combine dielectric, plasmonic and magnetic metamaterials in a single platform.

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Published date: 3 April 2020

Identifiers

Local EPrints ID: 448885
URI: http://eprints.soton.ac.uk/id/eprint/448885
ISSN: 2041-1723
PURE UUID: 3a77a335-e95a-4cfd-a841-633835b2c480
ORCID for Vassili Savinov: ORCID iD orcid.org/0000-0001-7203-7222
ORCID for Nikolai Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

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Date deposited: 07 May 2021 16:34
Last modified: 22 Nov 2021 02:37

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Contributors

Author: H.N.S. Krishnamoorthy
Author: Giorgio Adamo
Author: J Yin
Author: Vassili Savinov ORCID iD
Author: Cesare Soci

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