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Title: Nano-optical imaging of WS e 2 waveguide modes revealing light-exciton interactions

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [5];  [5];  [3];  [6];  [6];  [3];  [3];  [3];  [6];  [3];  [2]
  1. Argonne National Lab. (ANL), Lemont, IL (United States); Iowa State Univ., Ames, IA (United States)
  2. Univ. of Washington, Seattle, WA (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
  4. Argonne National Lab. (ANL), Lemont, IL (United States); William Paterson Univ., Wayne, NJ (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  6. Fudan Univ., Shanghai (China)

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. Furthermore, the mode-shifting phenomena are consistent with polariton formation in WSe2.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; AC05-00OR22725
OSTI ID:
1369571
Alternate ID(s):
OSTI ID: 1280187; OSTI ID: 1376353
Journal Information:
Physical Review B, Vol. 94, Issue 8; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 62 works
Citation information provided by
Web of Science

References (33)

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Cited By (20)

A Multibeam Interference Model for Analyzing Complex Near‐Field Images of Polaritons in 2D van der Waals Microstructures journal August 2019
A Simple Method for Synthesis of High-Quality Millimeter-Scale 1T′ Transition-Metal Telluride and Near-Field Nanooptical Properties journal August 2017
Tunable Modal Birefringence in a Low‐Loss Van Der Waals Waveguide journal May 2019
Plasmonic Nanolasers: Pursuing Extreme Lasing Conditions on Nanoscale journal April 2019
Scaling and Reflection Behaviors of Polaritons in Low‐Dimensional Materials journal September 2019
Recent Progress on Exciton Polaritons in Layered Transition‐Metal Dichalcogenides journal September 2019
Nanoimaging and Nanospectroscopy of Polaritons with Time Resolved s ‐SNOM journal September 2019
Polariton Photonics Using Structured Metals and 2D Materials journal October 2019
Probing Polaritons in 2D Materials journal January 2020
Polaritons in layered two-dimensional materials journal November 2016
Imaging exciton–polariton transport in MoSe2 waveguides journal May 2017
Polariton hyperspectral imaging of two-dimensional semiconductor crystals journal September 2019
Strong light–matter interaction in tungsten disulfide nanotubes journal January 2018
Near-field exciton imaging of chemically treated MoS 2 monolayers journal January 2018
Two-path self-interference in PTCDA active waveguides maps the dispersion and refraction of a single waveguide mode journal January 2019
Ultrafast nonequilibrium dynamics of strongly coupled resonances in the intrinsic cavity of W S 2 nanotubes journal October 2019
Transient exciton-polariton dynamics in WSe 2 by ultrafast near-field imaging journal February 2019
Polaritons in van der Waals materials journal October 2016
Strong interaction of quantum emitters with a WS 2 layer enhanced by a gold substrate journal January 2019
Polariton hyperspectral imaging of two-dimensional semiconductor crystals text January 2019

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