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Plasmonic Nanoantennas

Abstract : Linear and nonlinear optical responses of lithographically fabricated plasmonic nanoparticles (NPs) are investigated. Elastic scattering offers the fingerprints for localized surface plasmon resonances of NPs, which enhance nonlinear optical signals. Excitation polarization dependent far-field radiation of second-harmonic generation (SHG) shows a flipping effect, which is analysed from the aspects of resonant excitation shifting and SH phase interference as size changes. The radiations of metallic photoluminescence (MPL) in the weak and strong radiation field are studied sequentially. In the weak excitation, besides a process via electron-hole (e-h) pair recombination, particle plasmons (PPs) can be excited via Auger scattering of photo-excited d-band holes and the radiative decay of which gives rise to PPs modulated MPL. A model of total emission quantum efficiency involving both contributions has been used to explain MPL radiation difference between the bulk and the NPs. In the strong excitation, avalanche multiphoton PL (AMPL) is observed from the coupled heterodimers, which is interpreted as the recombination of avalanche ionized hot carriers seeded by multiphoton ionization (MI). MI is greatly assisted by local field of coupled NPs at the excitation stage. The giant photon emission can be evaluated as a function of local field environment and thermal factor of hot carriers. The spectral change from PPs modulated profile to the one indicates spontaneous emission of hot e-h pairs is explained by the diminishment of d-band hole scattering rate as temperature increases
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https://tel.archives-ouvertes.fr/tel-02954730
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Submitted on : Thursday, October 1, 2020 - 11:56:09 AM
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Jiyong_Wang_2017TROY0021.pdf
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  • HAL Id : tel-02954730, version 1

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Jiyong Wang. Plasmonic Nanoantennas. Micro and nanotechnologies/Microelectronics. Université de Technologie de Troyes; Eberhard-Karls-Universität (Tübingen, Allemagne), 2017. English. ⟨NNT : 2017TROY0021⟩. ⟨tel-02954730⟩

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