# Interaction between coaxial dielectric disks enhances the Q-factor

## TL;DR

This paper investigates how the interaction between two coaxial dielectric disks affects their resonant modes, revealing that decreasing the distance enhances the Q-factor significantly through avoided resonance crossing.

## Contribution

It demonstrates that the interaction between coaxial dielectric disks can be tuned to substantially increase the Q-factor via avoided crossing phenomena.

## Key findings

- Resonant modes exhibit avoided crossing as disks approach each other.
- Interaction enhances the Q-factor by an order of magnitude.
- Mode classification into symmetric and antisymmetric hybridizations.

## Abstract

We study the behavior of resonant modes under variation of the distance between two coaxial dielectric disks and show an avoided crossing of resonances because of interaction between the disks. Owing to coaxial arrange of disks the consideration is separated by the azimuthal index $m=0, 1, 2, \ldots$. In the present paper we consider the case $m=0$. For a long enough distance the resonant modes can be classified as symmetric and antisymmetric hybridizations of the resonant modes of the isolated disk. With decreasing of the distance the interaction becomes stronger that gives rise to avoided crossing of different resonances of the isolated disk. That in turn enhances the $Q$ factor of two disks by one order in magnitude compared to the $Q$ factor of isolated disk.