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2015 ; 5
(ä): 14788
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Optimizing plasmonic nanoantennas via coordinated multiple coupling
#MMPMID26423015
Lin L
; Zheng Y
Sci Rep
2015[Oct]; 5
(ä): 14788
PMID26423015
show ga
Plasmonic nanoantennas, which can efficiently convert light from free space into
sub-wavelength scale with the local field enhancement, are fundamental building
blocks for nanophotonic systems. Predominant design methods, which exploit a
single type of near- or far-field coupling in pairs or arrays of plasmonic
nanostructures, have limited the tunability of spectral response and the local
field enhancement. To overcome this limit, we are developing a general strategy
towards exploiting the coordinated effects of multiple coupling. Using Au bowtie
nanoantenna arrays with metal-insulator-metal configuration as examples, we
numerically demonstrate that coordinated design and implementation of various
optical coupling effects leads to both the increased tunability in the spectral
response and the significantly enhanced electromagnetic field. Furthermore, we
design and analyze a refractive index sensor with an ultra-high figure-of-merit
(254), a high signal-to-noise ratio and a wide working range of refractive
indices, and a narrow-band near-infrared plasmonic absorber with 100% absorption
efficiency, high quality factor of up to 114 and a wide range of tunable
wavelength from 800 nm to 1,500 nm. The plasmonic nanoantennas that exploit
coordinated multiple coupling will benefit a broad range of applications,
including label-free bio-chemical detection, reflective filter, optical trapping,
hot-electron generation, and heat-assisted magnetic recording.