Whispering gallery modes in hexagonal microcavities fabricated by crystal growth

TL;DR

This paper studies whispering gallery modes in hexagonal microcavities, analyzing mode behavior and Q factors, and demonstrates high-Q cavities fabricated via laser heated pedestal growth.

Contribution

It introduces a detailed analysis of whispering gallery modes in hexagonal cavities and demonstrates high-Q microcavities fabricated by laser heated pedestal growth.

Findings

Perturbed modes exhibit higher Q with larger corner radius.

Coupling between modes influences the Q factor.

High-Q cavities successfully fabricated using laser heated pedestal growth.

Abstract

We investigated the whispering gallery modes of cavities with a hexagonal cross-section. We found two different modes, namely perturbed and quasi-WGMs, of which the former exhibits the higher Q when the corner radius is large. We studied the dependence of Q on the curvature radius of the polygonal cavities and found that the coupling between the two modes determines the Q of the cavity. In addition we fabricated a cavity by employing laser heated pedestal growth and demonstrated a high Q.