Planar Bragg microcavities with monolayer WS$_2$ for strong exciton-photon coupling

TL;DR

This paper introduces a compact planar microcavity design using a dielectric slab with monolayer WS$_2$ that achieves strong exciton-photon coupling, with high Rabi splitting, suitable for integrated photonic circuits.

Contribution

The paper presents a novel, chip-compatible planar microcavity design with sub-100 nm thickness that demonstrates strong exciton-photon coupling and high Rabi splitting.

Findings

Rabi splitting exceeds 70 meV in sub-5 um structures

Design relies on guided optical modes, not vertical Bragg cavities

Theoretical model explains Rabi splitting dependence

Abstract

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.