Asymmetrically
Coupled Plasmonic Core and Nanotriplet
Satellites
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Abstract
Here,
we report asymmetrical multiple electromagnetic coupling
of plasmonic core and nanotriplet satellites. Within the plasmonic
core and nanotriplet satellites, an enhanced local field is generated
which expands across the core due to multiple electromagnetic coupling
between a core and nanotriplets. Based on 3D simulations of our plasmonic
nanosystem, the overall local field enhancement reaches to over 10<sup>4</sup> times, compared with that of a single nanoparticle array.
A strong local field distribution across the core to nanotriplets
as well as the critical role of the plasmonic core is demonstrated
through the 3D simulations. It is proposed that a self-assembled nanotriplet
array is completed through two stages of dewetting of a gold thin
film on an anodic aluminum oxide (AAO) template. Formation of the
core–nanotriplet satellites is significantly influenced by
geometrical parameters (i.e., the pore diameter and depth) of the
AAO template. Our experimental results show that the local field of
our plasmonic nanostructures is amplified up to ∼110 times
by adopting a core into the nanotriplet satellites, compared with
that of the nanotriplets array without a core. This approach offers
a promising strategy for creating an advanced nanoplasmonic platform
with strong local field distribution and high-throughput production