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Title: Coupled Dirac Plasmons in Topological Insulators

Abstract

Topological insulators are predicted to house spin-polarized two-dimensional Dirac plasmons. In topological insulator thin films, Dirac plasmons on the top and bottom surfaces will be coupled, giving rise to an unusual dispersion relationship. These plasmons are of interest both for fundamental science as well as applications in THz sensing and waveguiding. In this article, we present conclusive evidence for coupled Dirac plasmons excited in the surface states of topological insulator thin film stripe arrays by investigating how the plasmon frequency depends on both film thickness and stripe width. Bi2Se3 films of thickness 50-200nm are patterned into periodic stripes of width 1-4m to excite plasmons. The plasmon frequency dependence on both film thickness and stripe width is found to be in good agreement with theoretical models for couple 2D Dirac plasmons. Alternative explanations such as 2D massive plasmons are shown to be inconstant with data. Finally, effective mode indexes of up to 211 are reported, demonstrating incredible confinement of light in the THz frequency range.

Authors:
 [1];  [1]
  1. Univ. of Delaware, Newark, DE (United States). Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Univ. of Delaware, Newark, DE (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1593358
Alternate Identifier(s):
OSTI ID: 1433553
Grant/Contract Number:  
SC0017801
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Optical Materials
Additional Journal Information:
Journal Volume: 6; Journal Issue: 13; Journal ID: ISSN 2195-1071
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Ginley, Theresa P., and Law, Stephanie. Coupled Dirac Plasmons in Topological Insulators. United States: N. p., 2018. Web. doi:10.1002/adom.201800113.
Ginley, Theresa P., & Law, Stephanie. Coupled Dirac Plasmons in Topological Insulators. United States. doi:10.1002/adom.201800113.
Ginley, Theresa P., and Law, Stephanie. Wed . "Coupled Dirac Plasmons in Topological Insulators". United States. doi:10.1002/adom.201800113. https://www.osti.gov/servlets/purl/1593358.
@article{osti_1593358,
title = {Coupled Dirac Plasmons in Topological Insulators},
author = {Ginley, Theresa P. and Law, Stephanie},
abstractNote = {Topological insulators are predicted to house spin-polarized two-dimensional Dirac plasmons. In topological insulator thin films, Dirac plasmons on the top and bottom surfaces will be coupled, giving rise to an unusual dispersion relationship. These plasmons are of interest both for fundamental science as well as applications in THz sensing and waveguiding. In this article, we present conclusive evidence for coupled Dirac plasmons excited in the surface states of topological insulator thin film stripe arrays by investigating how the plasmon frequency depends on both film thickness and stripe width. Bi2Se3 films of thickness 50-200nm are patterned into periodic stripes of width 1-4m to excite plasmons. The plasmon frequency dependence on both film thickness and stripe width is found to be in good agreement with theoretical models for couple 2D Dirac plasmons. Alternative explanations such as 2D massive plasmons are shown to be inconstant with data. Finally, effective mode indexes of up to 211 are reported, demonstrating incredible confinement of light in the THz frequency range.},
doi = {10.1002/adom.201800113},
journal = {Advanced Optical Materials},
number = 13,
volume = 6,
place = {United States},
year = {2018},
month = {4}
}

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