• Editors' Suggestion
  • Rapid Communication

Nano-optical imaging of WSe2 waveguide modes revealing light-exciton interactions

Z. Fei, M. E. Scott, D. J. Gosztola, J. J. Foley, IV, J. Yan, D. G. Mandrus, H. Wen, P. Zhou, D. W. Zhang, Y. Sun, J. R. Guest, S. K. Gray, W. Bao, G. P. Wiederrecht, and X. Xu
Phys. Rev. B 94, 081402(R) – Published 1 August 2016
PDFHTMLExport Citation

Abstract

We report on a nano-optical imaging study of WSe2 thin flakes with scanning near-field optical microscopy (NSOM). The NSOM technique allows us to visualize in real space various waveguide photon modes inside WSe2. By tuning the excitation laser energy, we are able to map the entire dispersion of these waveguide modes both above and below the A exciton energy of WSe2. We found that all the modes interact strongly with WSe2 excitons. The outcome of the interaction is that the observed waveguide modes shift to higher momenta right below the A exciton energy. At higher energies, on the other hand, these modes are strongly damped due to adjacent B excitons or band-edge absorptions. The mode-shifting phenomena are consistent with polariton formation in WSe2.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 6 April 2016
  • Revised 9 July 2016

DOI:https://doi.org/10.1103/PhysRevB.94.081402

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Z. Fei1,2,*, M. E. Scott3, D. J. Gosztola1, J. J. Foley, IV1,4, J. Yan5,6, D. G. Mandrus5,6, H. Wen7, P. Zhou8, D. W. Zhang8, Y. Sun1, J. R. Guest1, S. K. Gray1, W. Bao8, G. P. Wiederrecht1, and X. Xu3,9

  • 1Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois 60439, USA
  • 2Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
  • 3Department of Physics, University of Washington, Seattle, Washington 98195, USA
  • 4Department of Chemistry, William Paterson University, Wayne, New Jersey 07470, USA
  • 5Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 6Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 7Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA
  • 8State Key Laboratory of ASIC and System, Department of Microelectronics, Fudan University, Shanghai 200433, China
  • 9Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, USA

  • *Corresponding author: zfei@iastate.edu

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 94, Iss. 8 — 15 August 2016

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×