Wave-vector analysis of plasmon-assisted distributed nonlinear photoluminescence along Au nanowires

We report a quantitative analysis of the wave-vector diagram emitted by nonlinear photoluminescence generated by a tightly focused pulsed laser beam and distributed along Au nanowire via the mediation of surface plasmon polaritons. The nonlinear photoluminescence is locally excited at key locations...

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Bibliographic Details
Published in:Physical review. B 2020-09, Vol.102 (11), p.1, Article 115414
Main Authors: Sharma, Deepak K., Agreda, Adrian, Barthes, Julien, Colas des Francs, Gérard, Pavan Kumar, G. V., Bouhelier, Alexandre
Format: Article
Language:English
Subjects:
Condensed Matter
Emission
Finite element method
Laser beams
Nanowires
Nonlinear Sciences
Photoluminescence
Physics
Polaritons
Pulsed lasers
Vector analysis
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Summary:We report a quantitative analysis of the wave-vector diagram emitted by nonlinear photoluminescence generated by a tightly focused pulsed laser beam and distributed along Au nanowire via the mediation of surface plasmon polaritons. The nonlinear photoluminescence is locally excited at key locations along the nanowire in order to understand the different contributions constituting the emission pattern measured in a conjugate Fourier plane of the microscope. Polarization-resolved measurements reveal that the nanowire preferentially emits nonlinear photoluminescence polarized transverse to the long axis at close to the detection limit wave vectors with a small azimuthal spread in comparison to the signal polarized along the long axis. We utilize the finite-element method to simulate the observed directional scattering by using localized incoherent sources placed on the nanowire. Simulation results faithfully mimic the directional emission of the nonlinear signal emitted by the different portions of the nanowire.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.102.115414