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Journal of Nanophotonics

Diffraction in nanoparticle lattices increases sensitivity of localized surface plasmon resonance to refractive index changes
Author(s): Phillip Blake; Sophie Kühne; Gregory T. Forcherio; Donald K. Roper
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Paper Abstract

Comparing predicted and measured spectra from isolated and ordered nanoparticles (NPs) indicates that ordering NPs into lattices can blueshift the localized surface plasmon resonant (LSPR) spectral feature and increase its wavelength sensitivity to local changes in refractive index. This occurs at lattice constants at or above the resonant wavelength. Numerical analysis indicates its results from effects of diffractive modes on LSPR features that are distinct from Fano resonances, which arise separately due to coupling between diffractive modes and localized plasmons. Refractive index sensitivity of the aggregate LSPR peak from NPs in a square lattice (314  nm RIU −1 ) was 5.8-fold higher than a comparable peak from random NPs (54  nm RIU −1 ). Measured sensitivities of Fano resonance features in two ordered samples were 127% and 312%, respectively, of the highest LSPR sensitivity from a random assembly of NPs.

Paper Details

Date Published: 16 June 2014
PDF: 12 pages
J. Nanophoton. 8(1) 083084 doi: 10.1117/1.JNP.8.083084
Published in: Journal of Nanophotonics Volume 8, Issue 1
Show Author Affiliations
Phillip Blake, Univ. of Arkansas (United States)
Sophie Kühne, Institute of Mechanical Process Engineering and Minerals Processing (Germany)
Gregory T. Forcherio, Univ. of Arkansas (United States)
Donald K. Roper, Univ. of Arkansas (United States)

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