Optical Characterization of Gold Nanoblock Dimers: From Capacitive Coupling to
Charge Transfer Plasmons and Rod Modes
Man-Nung Su
Quan Sun
Kosei Ueno
Wei-Shun Chang
Hiroaki Misawa
Stephan Link
10.1021/acs.jpcc.8b05755.s001
https://acs.figshare.com/articles/journal_contribution/Optical_Characterization_of_Gold_Nanoblock_Dimers_From_Capacitive_Coupling_to_Charge_Transfer_Plasmons_and_Rod_Modes/6881996
The 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 regimesî—¸capacitively
coupled, conductively bridged, and fused dimersî—¸and 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.
2018-07-17 00:00:00
electromagnetic simulations
interparticles distances
sample array fabrication
single-particle hyperspectral measurements
electromagnetic simulations yields insights
Charge Transfer Plasmons
plasmonic dimers
junction geometry
Rod Modes
metal nanoparticles
Optical Characterization
dimer geometry
Gold Nanoblock Dimers
resonance energy
square nanoantennas
conductively bridged
plasmon modes
gold nanoblock dimers