Combined photonic-plasmonic modes inside photonic crystal cavities

TL;DR

This paper numerically investigates hybrid photonic-plasmonic modes in a photonic crystal cavity with a metal nanowire, revealing narrow resonances with potential applications in biosensing.

Contribution

It demonstrates the formation of narrow hybrid modes in photonic crystal cavities interacting with metal nanowires, highlighting their potential for biosensing applications.

Findings

Narrow hybrid photonic-plasmonic resonances observed.

Increased mode lifetime due to reduced radiative losses.

Resonance properties depend on particle size, especially near the lattice constant.

Abstract

In this article, we present a numerical study of the optical properties of a metal nanowire interacting with a localized cavity in a two dimensional photonic crystal. The nature of the modes, their wavelength and width are investigated as a function of the particle radius. It is shown in particular that a particle with diameter about the lattice constant presents very narrow resonances corresponding to hybrid photonic-plasmonic modes, where increased lifetime is attributed to the decrease of the radiative losses by interaction with the photonic crystal. These results open interesting applications in areas where narrow plasmonic resonances are required, as in LSP-resonance based biosensing.