Interaction between dual cavity modes in a planar photonic microcavity

TL;DR

This paper theoretically investigates how dual cavity modes in a planar photonic microcavity interact, merge, or split by altering structural parameters, with implications for optical communication and quantum technologies.

Contribution

It provides a detailed analysis of mode merging and splitting mechanisms in microcavities, establishing threshold conditions based on structural parameters.

Findings

Merging of dual cavity modes into a single resonance by changing layer numbers.

Splitting of a single resonance into dual modes by increasing mirror reflectivity.

Potential applications in entangled photon generation and high-resolution filtering.

Abstract

We theoretically study the interaction between dual cavity modes in a planar photonic microcavity structure in the optical communication wavelength range. The merging and splitting of cavity mode is analyzed with realistic microcavity structures. The merging of dual cavity resonance into a single cavity resonance is achieved by changing the number of layers between the two cavities. The splitting of single cavity resonance into dual cavity resonance is obtained with an increase in the reflectivity of mirrors in the front and rear side of the microcavity structure. The threshold condition for the merging and splitting of cavity mode is established in terms of structural parameters. The physical origin of the merging of dual cavity modes into a single cavity resonance is discussed in terms of the electric field intensity distribution in the microcavity structure. The microcavity structure with dual cavity modes is useful for the generation of entangled photon pairs, for achieving the strong-coupling regime between exciton and photon, and for high resolution multi-wavelength filters in optical communication.