Parallel Collective Resonances in Arrays of Gold Nanorods

• Published in: Nano letters Vol. 14; no. 4; pp. 2079 - 2085
• Main Authors: Vitrey, Alan, Aigouy, Lionel, Prieto, Patricia, García-Martín, José Miguel, González, María U
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 09.04.2014
• Subjects: Arrays; Collective excitations (including excitons, polarons, plasmons and other charge-density excitations); Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Diffraction; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Exact sciences and technology; Gold; Materials science; Nanocrystalline materials; Nanoparticles; Nanorods; Nanoscale materials and structures: fabrication and characterization; Nanostructure; Nanotubes; Optical microscopy; Physics; Plasmons; Surface and interface electron states; near-field optical microscopy (SNOM); nanoparticles; Surface plasmons; Rayleigh anomalies; near-field patterns; collective resonances; Nanoparticles; Gold; Asymmetry; Far field; Resonance; Arrays; Nanorod; Nanostructured materials
• ISSN: 1530-6984; 1530-6992
• DOI: 10.1021/nl500238h

In this work we discuss the excitation of parallel collective resonances in arrays of gold nanoparticles. Parallel collective resonances result from the coupling of the nanoparticles localized surface plasmons with diffraction orders traveling in the direction parallel to the polarization vector. While they provide field enhancement and delocalization as the standard collective resonances, our results suggest that parallel resonances could exhibit greater tolerance to index asymmetry in the environment surrounding the arrays. The near- and far-field properties of these resonances are analyzed, both experimentally and numerically.