Oscillatory Optical Response of an Amorphous Two-Dimensional Array of Gold Nanoparticles
Journal article, 2012

The optical response of metallic nanoparticle arrays is dominated by localized surface plasmon excitations and is the sum of individual particle contributions modified by interparticle coupling that depends on specific array geometry. We demonstrate a so far unexplored distinct oscillatory behavior of the plasmon peak position, full width at half maximum, and extinction efficiency in large area amorphous arrays of Au nanodisks, which depend on the minimum particle center-to-center distance in the array. Amorphous arrays exhibit short-range order and are completely random at long distances. In our theoretical analysis we introduce a film of dipoles approach, within the framework of the coupled dipole approximation, which describes the array as an average particle surrounded by a continuum of dipoles with surface densities determined by the pair correlation function of the array.

extinction

plasmon resonance

chem. phys. 120

field

metamaterials

particles

colloidal lithography

line-shapes

solar

Author

Tomasz Antosiewicz

Chalmers, Applied Physics, Condensed Matter Theory

Peter Apell

Chalmers, Applied Physics

Michael Zäch

Chalmers, Applied Physics, Chemical Physics

Igor Zoric

Chalmers, Applied Physics, Chemical Physics

Christoph Langhammer

Chalmers, Applied Physics, Chemical Physics

Physical Review Letters

0031-9007 (ISSN) 1079-7114 (eISSN)

Vol. 109 24

Subject Categories

Physical Sciences

DOI

10.1103/PhysRevLett.109.247401

More information

Created

10/7/2017