Influence of the Environment on the Effect of Super Resonance in Mesoscale Dielectric Spheres

TL;DR

This paper investigates how the surrounding environment impacts the super-resonance effects in dielectric mesoscale spheres, revealing that the medium significantly influences internal field enhancement and resonance behavior.

Contribution

It demonstrates for the first time that the environment medium significantly affects super-resonance internal field enhancement in dielectric spheres, emphasizing the importance of considering surroundings in such studies.

Findings

Environment reduces internal field intensity in super-resonance.

Blue-shifted Mie size parameter enhances internal fields in air.

Super-resonance effects are environment-dependent.

Abstract

Dielectric mesoscale spheres have aroused strong interest because of their potential to localize light at deep subwavelength volume and to yield extremal internal magnetic and/or electric field enhancements. Recently, we showed that such particle could support high-order Mie resonance modes with giant field localization and enhancement. Optimizing the internal fields appears as a key challenge for enhancing wave matter interactions in dielectric mesoscale particles. However, a dielectric particle is always located in some medium, and not in a vacuum. Moreover, the question is how much the environment medium affects the internal field intensities enhancement in the super-resonance effect. Based on Mie theory we show for the first time that the presence of the environment leads to a significant decrease in the intensity of the field in the particle. Thus, the study of the effect of super-resonance becomes meaningless without taking into account the environment. However, a greater enhancement of the internal field is found for the blue-shifted Mie size parameter of the sphere when the particle, for example, is in air rather than in vacuum.