Designing coupled microcavity lasers for high-Q modes with unidirectional light emission

TL;DR

This paper introduces a simple and robust design of coupled microcavities that achieves high-quality factor modes with unidirectional light emission, suitable for practical experimental implementation across various refractive indices.

Contribution

The authors propose a novel coupled microcavity system combining a circular whispering gallery mode cavity with a deformed cavity acting as a waveguide, enabling directional emission without phase space analysis.

Findings

Achieved high-Q modes with directional emission across a broad refractive index range.

The design is simple, robust, and experimentally feasible.

No phase space information needed for implementation.

Abstract

We design coupled optical microcavities and report directional light emission from high-$Q$ modes for a broad range of refractive indices. The system consists of a circular cavity that provides a high-$Q$ mode in form of a whispering gallery mode, whereas an adjacent deformed microcavity plays the role of a waveguide or collimator of the light transmitted from the circular cavity. As a result of this very simple, yet robust, concept we obtain high-$Q$ modes with promising directional emission characteristics. No information about phase space is required, and the proposed scheme can be easily realized in experiments.