Local field enhancement at the core of cylindrical nanoinclusions embedded in a linear dielectric host matrix

TL;DR

This paper investigates the theoretical and numerical aspects of local electromagnetic field enhancement at the core of cylindrical nanoinclusions within a dielectric matrix, highlighting resonant behaviors relevant for nonlinear optics.

Contribution

It introduces a detailed analysis of resonance phenomena in metal/dielectric nanoinclusions, revealing multiple enhancement peaks and their dependence on inclusion composition and volume fraction.

Findings

Metal coated inclusions exhibit two resonance peaks.

Resonance peaks depend on the volume fraction of metal.

Enhancement effects are promising for nonlinear optical applications.

Abstract

In this paper we have discussed theoretical concepts and presented numerical results of local field enhancement at the core of different assemblages of metal/dielectric cylindrical nanoinclusions embedded in a linear dielectric host matrix. The obtained results show that for a composite with metal coated inclusions there exist two peak values of the enhancement factor at two different resonant frequencies. The existence of the second maxima becomes more important for a larger volume fraction of the metal part of the inclusion. For dielectric coated metal core inclusions and pure metal inclusions there is only one resonant frequency and one peak value of the enhancement factor. The enhancement of an electromagnetic wave is promising for the existence of nonlinear optical phenomena such as optical bistability which is important in optical communication and in optical computing such as optical switch and memory elements.