Abstract
Exciton polaritons, quasiparticles that strongly integrate transition metal dichalcogenides with large exciton binding energies and optical fields, exhibit unique properties due to their strong excitonic nonlinearity. However, intrinsic absorption losses pose a fundamental obstacle to all-optical tunability in exciton-polaritons due to the relatively broad resonance spectra. Therefore, it is necessary to determine structural configurations based on transition metal dichalcogenides to enhance the field distribution. Herein, the experimental details of a narrow trapped-mode based on asymmetric WS2 localized exciton-polaritons dual gratings are presented. The transmission value at the trapped mode wavelength can be tuned from 0.844 to 0.53 for an excitation power of 14.93 MWcm−2 with a pump wavelength of 366 nm. This is attributed to the narrow trapped-mode resonance and strong field enhancement in the asymmetric gratings. A relaxation time of approximately 35 ps is obtained, which is determined by the exciton lifetime of the WS2 flake. This work provides a foundation for the application of exciton-polaritons in all-optical devices.
Published Version
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