Excitation of confined modes on particle arrays

Abstract

We describe both theoretically and experimentally the existence and excitation of confined modes in planar arrays of gold nanodisks. Ordered 2D lattices of monodispersive nanoparticles are manufactured, embedded in a silica matrix, and exposed to evanescent prism-coupling illumination, leading to dark features in the reflectivity, which signal the presence of confined modes guided along the arrays. We find remarkable agreement between theory and experiment in the frequency-momentum dispersion of the resonances. Direct excitation of these modes reveals long propagation distances and deep extinction features. This characterization of guided modes shows the great potential of metallic particle arrays for optical signal processing and distant sensing applications.

References in corpus (5)

• Colloquium: Light scattering by particle and hole arrays
• Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers
• Surface-enhanced Raman scattering and fluorescence near metal nanoparticles
• Diffractive arrays of gold nanoparticles near an interface: critical role of the substrate
• Collective resonances in plasmonic crystals: Size matters