Finite element modeling of coupled optical microdisk resonators for displacement sensing

TL;DR

This paper uses finite element modeling to analyze coupled optical microdisk resonators, demonstrating their potential for high-precision displacement sensing comparable to Fabry-Perot resonators.

Contribution

It introduces a full vectorial finite element approach to model coupled microdisk resonators and evaluates their displacement sensing capabilities.

Findings

Coupled microdisks can match Fabry-Perot resonators in displacement sensitivity.

Finite element model accurately predicts eigenfrequencies of coupled modes.

Configuration of FreeFem++ for sphere eigenvalue problems is demonstrated.

Abstract

We analyze normal mode splitting in a pair of vertically coupled microdisk resonators. A full vectorial finite element model is used to find the eigen frequencies of the symmetric and antisymmetric composite modes as a function of coupling distance. We find that the coupled microdisks can compete with the best Fabry-Perot resonators in displacement sensing. We also show how we configured FreeFem++ for the sphere eigenvalue problem.