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, X. Xu
TL;DR
This study uses nano-optical imaging to visualize and analyze waveguide modes in WSe2 flakes, revealing strong exciton interactions and polariton formation through real-space dispersion mapping.
Contribution
It demonstrates the first real-space visualization of WSe2 waveguide modes and their dispersion, highlighting exciton interactions and polariton effects.
Findings
Waveguide modes are visualized inside WSe2 using NSOM.
Modes shift to higher momenta below the A exciton energy.
Strong damping of modes occurs at higher energies due to B excitons.
Abstract
We report on nano-optical imaging study of WSe2 thin flakes with the 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.
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