Oscillatory Optical Response of an Amorphous Two-Dimensional Array of Gold Nanoparticles
Artikel i vetenskaplig tidskrift, 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

Författare

Tomasz Antosiewicz

Chalmers, Teknisk fysik, Kondenserade materiens teori

Peter Apell

Chalmers, Teknisk fysik

Michael Zäch

Chalmers, Teknisk fysik, Kemisk fysik

Igor Zoric

Chalmers, Teknisk fysik, Kemisk fysik

Christoph Langhammer

Chalmers, Teknisk fysik, Kemisk fysik

Physical Review Letters

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

Vol. 109 24

Ämneskategorier

Fysik

DOI

10.1103/PhysRevLett.109.247401