Collective Effects in Second-Harmonic Generation from
Plasmonic Oligomers
Version 2 2018-08-15, 20:51
Version 1 2018-03-30, 12:03
Posted on 2018-08-15 - 20:51
We
investigate collective effects in plasmonic oligomers of different
symmetries using second-harmonic generation (SHG) microscopy with
cylindrical vector beams (CVBs). The oligomers consist of gold nanorods
that have a longitudinal plasmon resonance close to the fundamental
wavelength that is used for SHG excitation and whose long axes are
arranged locally such that they follow the distribution of the transverse
component of the electric field of radially or azimuthally polarized
CVBs in the focal plane. We observe that SHG from such rotationally
symmetric oligomers is strongly modified by the interplay between
the polarization properties of the CVB and interparticle coupling.
We find that the oligomers with radially oriented nanorods exhibit
small coupling effects. In contrast, we find that the oligomers with
azimuthally oriented nanorods exhibit large coupling effects that
lead to silencing of SHG from the whole structure. Our experimental
results are in very good agreement with numerical calculations based
on the boundary element method. The work describes a new route for
studying coupling effects in complex arrangements of nano-objects
and thereby for tailoring the efficiency of nonlinear optical effects
in such structures.
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Bautista, Godofredo; Dreser, Christoph; Zang, Xiaorun; Kern, Dieter P.; Kauranen, Martti; Fleischer, Monika (2018). Collective Effects in Second-Harmonic Generation from
Plasmonic Oligomers. ACS Publications. Collection. https://doi.org/10.1021/acs.nanolett.8b00308
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AUTHORS (6)
GB
Godofredo Bautista
CD
Christoph Dreser
XZ
Xiaorun Zang
DK
Dieter P. Kern
MK
Martti Kauranen
MF
Monika Fleischer