• Corpus ID: 248572177

Nonlinear self-action of ultrashort guided exciton-polariton pulses in dielectric slab coupled to 2D semiconductor

@inproceedings{Benimetskiy2022NonlinearSO,
  title={Nonlinear self-action of ultrashort guided exciton-polariton pulses in dielectric slab coupled to 2D semiconductor},
  author={Fedor A. Benimetskiy and A. V. Yulin and A. O. Mikhin and Vasily Kravtsov and Ivan V. Iorsh and M. S. Skolnick and I. A. Shelykh and Dmitry N Krizhanovskii and Anton K. Samusev},
  year={2022}
}

• F. Benimetskiy, A. Yulin, +6 authors A. Samusev
• Published 8 May 2022
• Physics

Recently reported large values of exciton-polariton nonlinearity of transition metal dichalcogenide (TMD) monolayers coupled to optically resonant structures approach the values characteristic for GaAs-based systems in the regime of strong light-matter coupling. Contrary to the latter, TMD-based polaritonic devices remain operational at ambient conditions and therefore have greater poten-tial for practical nanophotonic applications. Here we present the study of the nonlinear properties of Ta 2 O 5 slab waveguide coupled to a WSe 2 monolayer. We first confirm that the hybridization between waveguide photon mode and a 2D semiconductor exciton resonance gives rise to the formation of exciton-polaritons with Rabi splitting of 36 meV. By measuring transmission of ultrashort optical pulses through this TMD-based polaritonic waveguide, we demonstrate for the first time the strong nonlinear dependence of the output spectrum on the input pulse energy. Our theoretical model provides semi-quantitative agreement with experiment and gives insights into the dominating microscopic processes which determine the nonlinear pulse self-action: Coulomb inter-particle interaction and scattering to incoherent excitonic reservoir. We also confirm that at intermediate pump energies the system supports quasi-stationary solitonic regime of pulse propagation. Our results are essential for the development of nonlinear on-chip polaritonic devices based of 2D semiconductors. that the majority of the pulse radiation energy propagates without polaritonic absorption.