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Resonant Terahertz Light Absorption by Virtue of Tunable Hybrid Interface Phonon–Plasmon Modes in Semiconductor Nanoshells

Laboratory of Physics and Engineering of Nanomaterials, Department of Theoretical Physics, Moldova State University, MD-2009 Chisinau, Moldova
TQC, Universiteit Antwerpen, Universiteitsplein 1, 2610 Antwerpen, Belgium
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse 31, 115409 Moscow, Russia
Institute for Integrative Nanosciences, Leibniz IFW Dresden, Helmholtzstraße 20, D-01069 Dresden, Germany
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(7), 1442;
Received: 21 February 2019 / Revised: 27 March 2019 / Accepted: 29 March 2019 / Published: 6 April 2019
(This article belongs to the Special Issue Optical Properties of Confined Quantum Systems)
Metallic nanoshells have proven to be particularly versatile, with applications in biomedical imaging and surface-enhanced Raman spectroscopy. Here, we theoretically demonstrate that hybrid phonon-plasmon modes in semiconductor nanoshells offer similar advantages in the terahertz regime. We show that, depending on tm,n,nhe doping of the semiconductor shells, terahertz light absorption in these nanostructures can be resonantly enhanced due to the strong coupling between interface plasmons and phonons. A threefold to fourfold increase in the absorption peak intensity was achieved at specific values of electron concentration. Doping, as well as adapting the nanoshell radius, allowed for fine-tuning of the absorption peak frequencies. View Full-Text
Keywords: plasmons; absorption; phonons; nanoshells plasmons; absorption; phonons; nanoshells
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MDPI and ACS Style

Nika, D.L.; Pokatilov, E.P.; Fomin, V.M.; Devreese, J.T.; Tempere, J. Resonant Terahertz Light Absorption by Virtue of Tunable Hybrid Interface Phonon–Plasmon Modes in Semiconductor Nanoshells. Appl. Sci. 2019, 9, 1442.

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