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Oscillatory Optical Response of an Amorphous Two-Dimensional Array of Gold Nanoparticles

Tomasz Antosiewicz (Institutionen för teknisk fysik, Kondenserade materiens teori) ; S. Peter Apell (Institutionen för teknisk fysik) ; Michael Zäch (Institutionen för teknisk fysik, Kemisk fysik) ; Igor Zoric (Institutionen för teknisk fysik, Kemisk fysik) ; Christoph Langhammer (Institutionen för teknisk fysik, Kemisk fysik)
Physical Review Letters (0031-9007). Vol. 109 (2012), 24,
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: chem. phys. 120, line-shapes, colloidal lithography, plasmon resonance, particles, metamaterials, extinction, solar, field

Denna post skapades 2013-01-15. Senast ändrad 2017-09-14.
CPL Pubid: 170675


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens teori (1900-2015)
Institutionen för teknisk fysik (1900-2015)
Institutionen för teknisk fysik, Kemisk fysik (1900-2015)



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