Effect of Intertip Coupling on the Plasmonic Behavior
of Individual Multitipped Gold Nanoflower
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Abstract
We report here, the first experimental
realization on the selective
excitation of two closely lying tips from the same spherical core
of a multitipped gold nanoparticle with flower-like morphology. This
gives strong multipeaked resonance in the near-infrared region of
the far-field emission spectra showing a clear signature of tip to
tip coupling. The cathodoluminescence (CL) technique in a scanning
electron microscope (SEM) combined with finite-difference time-domain
(FDTD) simulation has helped us to identify the coupled plasmon modes
to be originated from the interaction between two closely spaced tips
with a narrow angular separation. Our analysis further estimates a
range of angular separation between the tips that triggers the onset
of the intertip coupling
