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

Fei, Z.; Scott, M. E.; Gosztola, D. J.; Foley, IV, J. J.; Yan, J.; Mandrus, D. G.; Wen, H.; Zhou, P.; Zhang, D. W.; Sun, Y.; Guest, J. R.; Gray, S. K.; Bao, W.; Wiederrecht, G. P.; Xu, X.

doi:10.1103/PhysRevB.94.081402

Title: Nano-optical imaging of $WS e_{2}$ waveguide modes revealing light-exciton interactions

Journal Article · Mon Aug 01 00:00:00 EDT 2016 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.94.081402 · OSTI ID:1369571

Fei, Z. ^[1]; Scott, M. E. ^[2]; Gosztola, D. J. ^[3]; Foley, IV, J. J. ^[4]; Yan, J. ^[5]; Mandrus, D. G. ^[5]; Wen, H. ^[3]; Zhou, P. ^[6]; Zhang, D. W. ^[6]; Sun, Y. ^[3]; Guest, J. R. ^[3]; Gray, S. K. ^[3]; Bao, W. ^[6]; Wiederrecht, G. P. ^[3]; Xu, X. ^[2]

Argonne National Lab. (ANL), Lemont, IL (United States); Iowa State Univ., Ames, IA (United States)
Univ. of Washington, Seattle, WA (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Argonne National Lab. (ANL), Lemont, IL (United States); William Paterson Univ., Wayne, NJ (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
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. Lastly, the mode-shifting phenomena are consistent with polariton formation in WSe₂.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1369571

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 8 Vol. 94; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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