# Evolution of the resonances of two parallel dielectric cylinders with distance between them

## TL;DR

This paper investigates how the resonant modes of two parallel dielectric cylinders evolve as their distance changes, revealing two interaction scenarios that affect resonance behavior and quality factors.

## Contribution

It introduces a detailed analysis of resonance evolution in coupled dielectric cylinders, highlighting two distinct interaction regimes and their impact on resonance properties.

## Key findings

- Strong interaction leads to unbound resonances with avoided crossings.
- Weak interaction results in bound resonances around highly excited modes.
- Both scenarios significantly enhance the Q factor compared to isolated cylinders.

## Abstract

We study behavior of resonant modes under change of the distance between two parallel dielectric cylinders. The processes of mutual scattering of Mie resonant modes by cylinders result in an interaction between the cylinders which lifts a degeneracy of resonances of the isolated cylinders. There are two basic scenarios of evolution of resonances with the distance. For strong interaction of cylinders resonances are unbound with avoided crossings from the of the Mie resonances with increasing of the distance. That scenario is typical for low exciting resonances (monopole and dipole). For weak interaction of cylinders the resonances are bound around highly excited Mie resonances. Both scenarios demonstrate a significant enhancement of the $Q$ factor compared to the case of isolated cylinder.