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Observation of a surface lattice resonance in a fractal arrangement of gold nanoparticles | | Ting Lee Chen
; Jord C. Prangsma
; Frans B. Segerink
; Dirk Jan Dikken
; Jennifer L. Herek
; | | Date: |
18 Feb 2015 | | Abstract: | The collective response of closely spaced metal particles in non-periodic
arrangements has the potential to provide a beneficial angular and frequency
dependence in sensing applications. In this paper, we investigate the optical
response of a Sierpinski fractal arrangement of gold nanoparticles and show
that it supports a collective resonance similar to the surface lattice
resonances that exist in periodic arrangements of plasmonic resonators. Using
back focal plane microscopy, we observe the leakage of radiation out of a
surface lattice resonance that is efficiently excited when the wavenumber of
the incident light matches a strong Fourier component of the fractal structure.
The efficient coupling between localized surface plasmons leads to a collective
resonance and a Fano-like feature in the scattering spectrum. Our experimental
observations are supported by numerical simulations based on the coupled-dipole
approximation and finite-difference time-domain methods. This work presents a
first step towards the application of fractal arrangements for plasmonic
applications | | Source: | arXiv, 1502.5181 | | Services: | Forum | Review | PDF | Favorites | |
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