Blue-Shifted
Narrow Localized Surface Plasmon Resonance
from Dipole Coupling in Gold Nanoparticle Random Arrays
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Abstract
In
this work, we develop a simple method to produce highly uniform
localized surface plasmon resonance (LSPR) substrates based on self-assembly
of colloidal gold nanoparticles onto pretreated glass substrates.
The LSPR wavelength of the gold nanoparticle arrays is blue-shifted
from that of the gold nanoparticles in solution and the single gold
nanoparticles on glass substrate. The LSPR width is narrower than
that of the single gold nanoparticles. The blue-shifted LSPR is due
to the long-range dipole coupling in the gold nanoparticle random
arrays indicated from simulations using the T-matrix method. In addition
to the popularly used LSPR wavelength dependence on the dielectric
environment, we have found that the LSPR width of the gold nanoparticle
random arrays is also sensitive to the change in the dielectric environment.
The LSPR substrates are reproducible, uniform, and robust with potential
applications in LSPR sensing and imaging