We propose and numerically investigate a novel compact planar microcavity design based on a high-index dielectric slab waveguide with embedded monolayer semiconductor. In comparison to more traditional vertical Bragg microcavities, our design relies on the transmission of guided optical modes and achieves strong exciton-photon coupling in a chip-compatible and compact geometry with sub-100 nm thickness. We show that Rabi splitting values of more than 70 meV can be obtained in planar microcavities with the total length below 5 um. Further, we reveal the dependence of Rabi splitting on the dimensions of the structure and explain it with a simple theoretical model. Our results contribute towards the development of novel compact 2D semiconductor-based components for integrated photonic circuits.
@article{arxiv.2409.06335,
title = {Planar Bragg microcavities with monolayer WS$_2$ for strong exciton-photon coupling},
author = {A. O. Mikhin and A. A. Seredin and R. S. Savelev and D. N. Krizhanovskii and A. K. Samusev and V. Kravtsov},
journal= {arXiv preprint arXiv:2409.06335},
year = {2026}
}