Strong second-harmonic generation from Au-Al heterodimers

Second-harmonic generation (SHG) is investigated from three kinds of lithographically fabricated plasmonic systems: Al monomers, Au monomers and Au-Al heterodimers with nanogaps of 20 nm. Spectrally integrated SHG intensities and the linear optical responses are recorded and compared. The results sh...

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Veröffentlicht in:Nanoscale 2019-12, Vol.11 (48), p.23475-23481
Hauptverfasser: Wang, Jiyong, Butet, Jérémy, Bernasconi, Gabriel David, Baudrion, Anne-Laure, Lévêque, Gaëtan, Horrer, Andreas, Horneber, Anke, Martin, Olivier J. F, Meixner, Alfred J, Fleischer, Monika, Adam, Pierre-Michel, Zhang, Dai
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container_end_page 23481
container_issue 48
container_start_page 23475
container_title Nanoscale
container_volume 11
creator Wang, Jiyong
Butet, Jérémy
Bernasconi, Gabriel David
Baudrion, Anne-Laure
Lévêque, Gaëtan
Horrer, Andreas
Horneber, Anke
Martin, Olivier J. F
Meixner, Alfred J
Fleischer, Monika
Adam, Pierre-Michel
Zhang, Dai
description Second-harmonic generation (SHG) is investigated from three kinds of lithographically fabricated plasmonic systems: Al monomers, Au monomers and Au-Al heterodimers with nanogaps of 20 nm. Spectrally integrated SHG intensities and the linear optical responses are recorded and compared. The results show that for the monomer nanoantennas, the SHG signal depends sensitively on the linear excitation of the plasmon resonance by the fundamental wavelength. For Au-Al heterodimer nanoantennas, apart from fundamental resonant excitation, nonlinear optical factors such as SH driving fields and phase interferences need to be taken into account, which play significant roles at the excitation and scattering stages of SHG radiation. It is interesting to note that a possible energy transfer process could take place between the two constituting nanoparticles (NPs) in the Au-Al heterodimers. Excited at the linear plasmon resonance, the Au NP transfers the absorbed energy from the fundamental field to the nearby Al NP, which efficiently scatters SHG to the far-field, giving rise to an enhanced SHG intensity. The mechanisms reported here provide new approaches to boost the far-field SHG radiation by taking full advantage of strongly coupled plasmonic oscillations and the synergism from materials of different compositions. Strong second-harmonic generation from Au-Al heterodimers with a nanogap is observed and predicted, mainly attributed to coupling of plasmonic resonance in the fundamental field and synergistic driving from constituting nanoantennas in the SH field.
doi_str_mv 10.1039/c9nr07644a
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For Au-Al heterodimer nanoantennas, apart from fundamental resonant excitation, nonlinear optical factors such as SH driving fields and phase interferences need to be taken into account, which play significant roles at the excitation and scattering stages of SHG radiation. It is interesting to note that a possible energy transfer process could take place between the two constituting nanoparticles (NPs) in the Au-Al heterodimers. Excited at the linear plasmon resonance, the Au NP transfers the absorbed energy from the fundamental field to the nearby Al NP, which efficiently scatters SHG to the far-field, giving rise to an enhanced SHG intensity. The mechanisms reported here provide new approaches to boost the far-field SHG radiation by taking full advantage of strongly coupled plasmonic oscillations and the synergism from materials of different compositions. 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source Royal Society Of Chemistry Journals 2008-
subjects Energy transfer
Engineering Sciences
Excitation
Far fields
Gold
Micro and nanotechnologies
Microelectronics
Monomers
Nanoparticles
Optics
Photonic
Resonance
Second harmonic generation
title Strong second-harmonic generation from Au-Al heterodimers
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