Imaging exciton–polariton transport in MoSe2 waveguides
Abstract
Exciton polaritons, which are hybrid modes between photons and excitons in semiconductors, attract broad research interests in both fundamental science and technological applications. Previous studies are focused on far-field spectroscopy of exciton polaritons with cavity or prism coupling. Here we report on real-space nano-optical imaging study of exciton polaritons using the near-field scanning optical microscopy. The observed polaritons are formed by coupling between photons and excitons in thin flakes of group VI transition-metal dichalcogenides and they show sensitive dependence with the flake thickness. The wavelength of these exciton polaritons can reach as low as 300 nm. By tuning the excitation laser energy, we are able to map the entire polariton dispersion both above and below the A exciton energy. Further analysis indicates that polaritons can propagate over many microns below the exciton energy but are subject to strong Landau damping above.
- Authors:
-
[2];
- Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
- Univ. of Washington, Seattle, WA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Publication Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1368051
- Alternate Identifier(s):
- OSTI ID: 1376529
- Report Number(s):
- IS-J 9346
Journal ID: ISSN 1749-4885; nphoton.2017.65
- Grant/Contract Number:
- DE-AC02-07CH11358; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Photonics
- Additional Journal Information:
- Journal Volume: 11; Journal Issue: 6; Journal ID: ISSN 1749-4885
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE
Citation Formats
Hu, F., Luan, Y., Scott, M. E., Yan, J., Mandrus, D. G., Xu, X., and Fei, Z. Imaging exciton–polariton transport in MoSe2 waveguides. United States: N. p., 2017.
Web. doi:10.1038/nphoton.2017.65.
Hu, F., Luan, Y., Scott, M. E., Yan, J., Mandrus, D. G., Xu, X., & Fei, Z. Imaging exciton–polariton transport in MoSe2 waveguides. United States. https://doi.org/10.1038/nphoton.2017.65
Hu, F., Luan, Y., Scott, M. E., Yan, J., Mandrus, D. G., Xu, X., and Fei, Z. Mon .
"Imaging exciton–polariton transport in MoSe2 waveguides". United States. https://doi.org/10.1038/nphoton.2017.65. https://www.osti.gov/servlets/purl/1368051.
@article{osti_1368051,
title = {Imaging exciton–polariton transport in MoSe2 waveguides},
author = {Hu, F. and Luan, Y. and Scott, M. E. and Yan, J. and Mandrus, D. G. and Xu, X. and Fei, Z.},
abstractNote = {Exciton polaritons, which are hybrid modes between photons and excitons in semiconductors, attract broad research interests in both fundamental science and technological applications. Previous studies are focused on far-field spectroscopy of exciton polaritons with cavity or prism coupling. Here we report on real-space nano-optical imaging study of exciton polaritons using the near-field scanning optical microscopy. The observed polaritons are formed by coupling between photons and excitons in thin flakes of group VI transition-metal dichalcogenides and they show sensitive dependence with the flake thickness. The wavelength of these exciton polaritons can reach as low as 300 nm. By tuning the excitation laser energy, we are able to map the entire polariton dispersion both above and below the A exciton energy. Further analysis indicates that polaritons can propagate over many microns below the exciton energy but are subject to strong Landau damping above.},
doi = {10.1038/nphoton.2017.65},
journal = {Nature Photonics},
number = 6,
volume = 11,
place = {United States},
year = {Mon May 08 00:00:00 EDT 2017},
month = {Mon May 08 00:00:00 EDT 2017}
}
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