Electromagnetic waves generated by a hybrid dielectric-plasmonic dimer

TL;DR

This paper demonstrates that hybrid dielectric-plasmonic nano-dimers can polarize both electric and magnetic fields, potentially altering the electromagnetic properties of the surrounding medium when sharing common resonant frequencies.

Contribution

The work derives the asymptotic expansion of fields generated by hybrid nano-dimers in the subwavelength regime near their shared resonant frequencies.

Findings

Hybrid dimers can polarize both electric and magnetic fields.

Dual modification of permittivity and permeability occurs at shared resonant frequencies.

Asymptotic expansion of fields near resonance is derived.

Abstract

We know that the electric field generated by a plasmonic nano-particle (with negative permittivity) is given as a polarization of the incident electric field. Similarly, the electric field produced by a dielectric nano-particle (with positive but high permittivity) is given as a polarization of the incident magnetic field. In this work, we demonstrate that a hybrid dimer composed of two closely coupled nano-particles, one plasmonic and the other dielectric can polarize both the incident electric and magnetic fields. Consequently, such hybrid dimers have the potential to modify both the electric permittivity and magnetic permeability of the surrounding medium. However, this dual modification occurs only when the two nano-particles share common resonant frequencies. We derive the asymptotic expansion of the fields generated by these hybrid dimers in the subwavelength regime for incident frequencies near their shared resonant frequencies.