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Title: Surface plasmon polaritons in a topological insulator embedded in an optical cavity

Abstract

Very recently, the surface plasmons in a topological insulator (TI) have been experimentally observed by exciting these collective modes with polarized light [P. Di Pietro, M. Ortolani, O. Limaj, A. Di Gaspare, V. Giliberti, F. Giorgianni, M. Brahlek, N. Bansal, N. Koirala, S. Oh, P. Calvani, and S. Lupi, Nat. Nanotechnol. 8, 556 (2013)]. Motivated by this experimental work, here we present a theoretical study on the surface plasmon polaritons (SPPs) induced by plasmon-photon interactions in a TI thin film embedded in an optical cavity. It is found that the frequencies of SPP modes are within the terahertz (THz) bandwidth and can be tuned effectively by adjusting the surface electron density and/or the optical cavity length. Since the surface electron density can be well controlled by the gate-voltage applied perpendicular to the TI surface, our theoretical results indicate that gated TI thin films may have potential applications in the electrically tunable THz plasmonic devices.

Authors:
 [1];  [1];  [2]
  1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22257821
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 104; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ELECTRON DENSITY; PHOTONS; PLASMONS; POLARONS; SURFACES; THIN FILMS; TOPOLOGY

Citation Formats

Li, L. L., E-mail: lllihfcas@foxmail.com, Xu, W., E-mail: wenxu-issp@aliyun.com, and Department of Physics, Yunnan University, Kunming 650091. Surface plasmon polaritons in a topological insulator embedded in an optical cavity. United States: N. p., 2014. Web. doi:10.1063/1.4869228.
Li, L. L., E-mail: lllihfcas@foxmail.com, Xu, W., E-mail: wenxu-issp@aliyun.com, & Department of Physics, Yunnan University, Kunming 650091. Surface plasmon polaritons in a topological insulator embedded in an optical cavity. United States. doi:10.1063/1.4869228.
Li, L. L., E-mail: lllihfcas@foxmail.com, Xu, W., E-mail: wenxu-issp@aliyun.com, and Department of Physics, Yunnan University, Kunming 650091. Mon . "Surface plasmon polaritons in a topological insulator embedded in an optical cavity". United States. doi:10.1063/1.4869228.
@article{osti_22257821,
title = {Surface plasmon polaritons in a topological insulator embedded in an optical cavity},
author = {Li, L. L., E-mail: lllihfcas@foxmail.com and Xu, W., E-mail: wenxu-issp@aliyun.com and Department of Physics, Yunnan University, Kunming 650091},
abstractNote = {Very recently, the surface plasmons in a topological insulator (TI) have been experimentally observed by exciting these collective modes with polarized light [P. Di Pietro, M. Ortolani, O. Limaj, A. Di Gaspare, V. Giliberti, F. Giorgianni, M. Brahlek, N. Bansal, N. Koirala, S. Oh, P. Calvani, and S. Lupi, Nat. Nanotechnol. 8, 556 (2013)]. Motivated by this experimental work, here we present a theoretical study on the surface plasmon polaritons (SPPs) induced by plasmon-photon interactions in a TI thin film embedded in an optical cavity. It is found that the frequencies of SPP modes are within the terahertz (THz) bandwidth and can be tuned effectively by adjusting the surface electron density and/or the optical cavity length. Since the surface electron density can be well controlled by the gate-voltage applied perpendicular to the TI surface, our theoretical results indicate that gated TI thin films may have potential applications in the electrically tunable THz plasmonic devices.},
doi = {10.1063/1.4869228},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 11,
volume = 104,
place = {United States},
year = {2014},
month = {3}
}