16 June 2014 Diffraction in nanoparticle lattices increases sensitivity of localized surface plasmon resonance to refractive index changes
Author Affiliations +
J. of Nanophotonics, 8(1), 083084 (2014). doi:10.1117/1.JNP.8.083084
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.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Phillip Blake, Sophie Kühne, Gregory T. Forcherio, Donald K. Roper, "Diffraction in nanoparticle lattices increases sensitivity of localized surface plasmon resonance to refractive index changes," Journal of Nanophotonics 8(1), 083084 (16 June 2014). http://dx.doi.org/10.1117/1.JNP.8.083084
JOURNAL ARTICLE
12 PAGES


SHARE
KEYWORDS
Nanoparticles

Particles

Diffraction

Electroluminescence

Refractive index

Mie scattering

Gold

Back to Top