Near-field spectroscopy of Dirac plasmons in Bi2Se3 ribbon arrays
Abstract
Plasmons supported in the massless electron surface states of topological insulators (TIs), known as Dirac plasmons, have great potential in next generation optoelectronics. However, their inherent confinement to the surface makes the investigation of Dirac plasmons challenging. Near-field techniques provide the ideal platform to directly probe Dirac plasmons due to the sensitivity to evanescent fields at the surface. Here, we demonstrate the use of aperture near-field spectroscopy for the investigation of localized terahertz (THz) Dirac plasmon resonances in Bi2Se3 ribbon arrays with widths ranging from 10 to 40 µm. Unlike scattering THz near-field techniques, the aperture method is most sensitive to plasmons with the relevant lower-momenta corresponding to plasmon wavelengths on the scale of ~20 µm. The combination of THz time-domain spectroscopy and aperture near-field microscopy enables sampling of localized Dirac plasmons in the near-field zone in the 0.5–2.5 THz range. We map the plasmon dispersion, which reveals a coupled plasmon–phonon polariton interaction. The near-field spectra show a higher contrast of the upper polariton branch in comparison with far-field observations. The information revealed by aperture near-field spectroscopy could deepen our understanding of the behavior of Dirac plasmons, leading to the potential development of real-world TI devices.
- Authors:
-
[1];
[2];
[3];
[3];
[2];
[4]
- University College London (United Kingdom)
- University of Delaware, Newark, DE (United States)
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- University College London (United Kingdom); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Publication Date:
- Research Org.:
- Univ. of Delaware, Newark, DE (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); Engineering and Physical Sciences Research Council (EPSRC); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1974776
- Grant/Contract Number:
- SC0017801; EP/P021859/1; EP/L015455/1; EP/T517793/1; NA0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- APL Photonics
- Additional Journal Information:
- Journal Volume: 8; Journal Issue: 5; Journal ID: ISSN 2378-0967
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING
Citation Formats
Hale, Lucy L., Wang, Zhengtianye, Harris, C. Thomas, Brener, Igal, Law, Stephanie, and Mitrofanov, Oleg. Near-field spectroscopy of Dirac plasmons in Bi2Se3 ribbon arrays. United States: N. p., 2023.
Web. doi:10.1063/5.0135867.
Hale, Lucy L., Wang, Zhengtianye, Harris, C. Thomas, Brener, Igal, Law, Stephanie, & Mitrofanov, Oleg. Near-field spectroscopy of Dirac plasmons in Bi2Se3 ribbon arrays. United States. https://doi.org/10.1063/5.0135867
Hale, Lucy L., Wang, Zhengtianye, Harris, C. Thomas, Brener, Igal, Law, Stephanie, and Mitrofanov, Oleg. Wed .
"Near-field spectroscopy of Dirac plasmons in Bi2Se3 ribbon arrays". United States. https://doi.org/10.1063/5.0135867. https://www.osti.gov/servlets/purl/1974776.
@article{osti_1974776,
title = {Near-field spectroscopy of Dirac plasmons in Bi2Se3 ribbon arrays},
author = {Hale, Lucy L. and Wang, Zhengtianye and Harris, C. Thomas and Brener, Igal and Law, Stephanie and Mitrofanov, Oleg},
abstractNote = {Plasmons supported in the massless electron surface states of topological insulators (TIs), known as Dirac plasmons, have great potential in next generation optoelectronics. However, their inherent confinement to the surface makes the investigation of Dirac plasmons challenging. Near-field techniques provide the ideal platform to directly probe Dirac plasmons due to the sensitivity to evanescent fields at the surface. Here, we demonstrate the use of aperture near-field spectroscopy for the investigation of localized terahertz (THz) Dirac plasmon resonances in Bi2Se3 ribbon arrays with widths ranging from 10 to 40 µm. Unlike scattering THz near-field techniques, the aperture method is most sensitive to plasmons with the relevant lower-momenta corresponding to plasmon wavelengths on the scale of ~20 µm. The combination of THz time-domain spectroscopy and aperture near-field microscopy enables sampling of localized Dirac plasmons in the near-field zone in the 0.5–2.5 THz range. We map the plasmon dispersion, which reveals a coupled plasmon–phonon polariton interaction. The near-field spectra show a higher contrast of the upper polariton branch in comparison with far-field observations. The information revealed by aperture near-field spectroscopy could deepen our understanding of the behavior of Dirac plasmons, leading to the potential development of real-world TI devices.},
doi = {10.1063/5.0135867},
journal = {APL Photonics},
number = 5,
volume = 8,
place = {United States},
year = {Wed May 24 00:00:00 EDT 2023},
month = {Wed May 24 00:00:00 EDT 2023}
}
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