Carrier-doped semiconductor nanocrystals (NCs) offer strong plasmonic responses at frequencies beyond those accessible by conventional plasmonic nanoparticles. Like their noble metal analogues, these emerging materials can harness free space radiation and confine it to the nanoscale but at resonance frequencies that are natively infrared and spectrally tunable by carrier concentration. In this work we combine monochromated STEM-EELS and theoretical modeling to investigate the capability of colloidal indium tin oxide (ITO) NC pairs to form hybridized plasmon modes, providing an additional route to influence the IR plasmon spectrum. These results demonstrate that ITO NCs may have greater coupling strength than expected, emphasizing their potential for near-field enhancement and resonant energy transfer in the IR region.
Emergent from the discrete spatial periodicity of plasmonic
arrays,
surface lattice resonances (SLRs) are characterized as dispersive,
high-quality polaritonic modes that can be selectively excited at
specific points in their photonic band structure by plane-wave light
of varying frequency, polarization, and angle of incidence. Room-temperature
Bose–Einstein condensation of exciton polaritons, lasing, and
nonlinear matter-wave physics have all found origins in SLR systems,
but to date, little attention has been paid to their thermal behavior.
Here, we combine analytical theory and numerical calculations to investigate
the photothermal properties of SLRs in periodic 1D and 2D arrays of
plasmonic nanoparticles coupled to each other and to the electromagnetic
far-field via transverse radiation. Specifically, we demonstrate how
to create steady-state SLR thermal gradients spanning from the nanoscale
to hundreds of microns that are actively controllable using light
in spite of heat diffusion. We also demonstrate the surprising ability
to localize thermal gradients at the lattice edges in topologically
non-trivial SLR dimer lattices, thereby establishing a class of extraordinary
thermal responses that are unconventional in ordinary materials. This
work exposes a new direction in thermoplasmonics that has only just
now begun to be explored.
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