NDLI: Topological Insulator Films for Terahertz Photonics.

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Topological Insulator Films for Terahertz Photonics.

Content Provider	Europe PMC
Author	Kuznetsov, Kirill A. Tarasenko, Sergey A. Kovaleva, Polina M. Kuznetsov, Petr I. Lavrukhin, Denis V. Goncharov, Yury G. Ezhov, Alexander A. Ponomarev, Dmitry S. Kitaeva, Galiya Kh.
Editor	Li, Feng Li, Ang
Copyright Year	2022
Abstract	We discuss experimental and theoretical studies of the generation of the third terahertz (THz) frequency harmonic in thin films of Bi2Se3 and Bi2-xSbxTe3-ySey (BSTS) topological insulators (TIs) and the generation of THz radiation in photoconductive antennas based on the TI films. The experimental results, supported by the developed kinetic theory of third harmonic generation, show that the frequency conversion in TIs is highly efficient because of the linear energy spectrum of the surface carriers and fast energy dissipation. In particular, the dependence of the third harmonic field on the pump field remains cubic up to the pump fields of 100 kV/cm. The generation of THz radiation in TI-based antennas is obtained and described for the pump, with the energy of photons corresponding to the electron transitions to higher conduction bands. Our findings open up possibilities for advancing TI-based films into THz photonics as efficient THz wave generators and frequency converters.
Journal	Nanomaterials (Basel, Switzerland)
Volume Number	12
PubMed Central reference number	PMC9658460
Issue Number	21
PubMed reference number	36364555
e-ISSN	20794991
DOI	10.3390/nano12213779
Language	English
Publisher	MDPI
Publisher Date	2022-10-26
Access Restriction	Open
Rights License	Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). © 2022 by the authors.
Subject Keyword	topological insulator terahertz radiation THz third harmonic generation photoconductive antenna bismuth selenide chalcogen-ordered tetradymite
Content Type	Text
Resource Type	Article
Subject	Chemical Engineering Materials Science

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