Optimization of surface plasmon excitation using resonant nanoparticle arrays above a silver film

Amitabh Ghoshal; Pieter G. Kik

doi:10.1117/12.735340

22 September 2007 Optimization of surface plasmon excitation using resonant nanoparticle arrays above a silver film

Amitabh Ghoshal, Pieter G. Kik

Proceedings Volume 6641, Plasmonics: Metallic Nanostructures and Their Optical Properties V; 664119 (2007) https://doi.org/10.1117/12.735340
Event: NanoScience + Engineering, 2007, San Diego, California, United States

Abstract

A plasmonic coupling device consisting of an array of ellipsoidal silver nanoparticles embedded in silica in close proximity to a silver surface is studied. By tuning the inter-particle spacing, the shape of the particles in the array, and the height of the array above the silver film, the array-mediated surface plasmon excitation is studied. Finite Integration Technique simulations of such a plasmon coupler optimized for operation at a free space wavelength of 676 nm are presented. Plane wave normal incidence excitation of the system results is seen to result in resonantly enhanced fields near the nanoparticles, which in turn excite surface plasmons on the metal film. The existence of an optimum particle-surface separation for maximum surface plasmon excitation efficiency is demonstrated. Analysis of the frequency dependent electric field in the simulation volume as a function of particle aspect ratio reveals the influence of the particle resonance and the surface plasmon resonance on the excitation efficiency.

Citation Download Citation

Amitabh Ghoshal and Pieter G. Kik "Optimization of surface plasmon excitation using resonant nanoparticle arrays above a silver film", Proc. SPIE 6641, Plasmonics: Metallic Nanostructures and Their Optical Properties V, 664119 (22 September 2007); https://doi.org/10.1117/12.735340

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