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Optical Characterization of Gold Nanoblock Dimers: From Capacitive Coupling to Charge Transfer Plasmons and Rod Modes
journal contribution
posted on 2018-07-17, 00:00 authored by Man-Nung Su, Quan Sun, Kosei Ueno, Wei-Shun Chang, Hiroaki Misawa, Stephan LinkThe optical properties
of plasmonic dimers consisting of two adjacent
metal nanoparticles can be tuned over a broad spectral range by changing
only slightly the dimer geometry. Most drastic are the changes in
the smallest interparticles distances, and often only optical spectroscopy
together with electromagnetic simulations yields insights into the
geometry of the junction. Here, we study the coupling of gold nanoblock
dimers, two square nanoantennas with different nanogaps between their
closest corners. We identify three different coupling regimescapacitively
coupled, conductively bridged, and fused dimersand optically
characterize the transitions between them. By combining sample array
fabrication, single-particle hyperspectral measurements, and electromagnetic
simulations, we were able to examine in detail the effects of junction
geometry on the resonance energy and intensity of the plasmon modes
supported by gold nanoblock dimers.
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electromagnetic simulationsinterparticles distancessample array fabricationsingle-particle hyperspectral measurementselectromagnetic simulations yields insightsCharge Transfer Plasmonsplasmonic dimersjunction geometryRod Modesmetal nanoparticlesOptical Characterizationdimer geometryGold Nanoblock Dimersresonance energysquare nanoantennasconductively bridgedplasmon modesgold nanoblock dimers
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