Landau damping of surface plasmons in metal nanostructures

Shahbazyan, Tigran V.

doi:10.1103/physrevb.94.235431

Cited by 68 publications

(53 citation statements)

References 76 publications

(211 reference statements)

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“…For system's characteristic size L ≫ λ F , where λ F is the Fermi wavelength, the main contribution comes from the direct and singly-reflected paths, while the higher-order reflections are suppressed as powers of λ F /L. In the leading order, we obtain G(ǫ; s, s ′ ) = 2G 0 (ǫ, s − s ′ ), where G 0 (ǫ, r) = (m/2π 2 )e ikǫr /r, with k ǫ = √ 2mǫ/ , is the free electron Green function and factor 2 comes from equal contributions of the direct and singly-reflected paths at a surface point [58]. It is now easy to see that the integrand of Eq.…”

Section: Theorymentioning

confidence: 95%

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Surface-Assisted Carrier Excitation in Plasmonic Nanostructures

Shahbazyan

2017

Plasmonics

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We present a quantum-mechanical model for surface-assisted carrier excitation by optical fields in plasmonic nanostructures of arbitrary shape. We derive an explicit expression, in terms of local fields inside the metal structure, for surface absorbed power and surface scattering rate that determine the enhancement of carrier excitation efficiency near the metal-dielectric interface. We show that surface scattering is highly sensitive to the local field polarization, and can be incorporated into metal dielectric function along with phonon and impurity scattering. We also show that the obtained surface scattering rate describes surface-assisted plasmon decay (Landau damping) in nanostructures larger than the nonlocality scale. Our model can be used for calculations of plasmon-assisted hot carrier generation rates in photovoltaics and photochemistry applications.

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Section: Theorymentioning

confidence: 95%

“…Excitation of an e-h pair with a large, compared to the electron level spacing, energy ω requires momentum transfer to the cavity boundary. We note that the boundary contribution to M αβ can be presented as an integral over the metal surface [58],…”

Section: Theorymentioning

confidence: 99%

Surface-Assisted Carrier Excitation in Plasmonic Nanostructures

Shahbazyan

2017

Plasmonics

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“…Earlier theoretical studies based on the hydrodynamic Drude model, which accounts well for nonlocal blueshifts in noble metals, have already predicted an impact of nonlocality on emitter-plasmon coupling [45][46][47][48]. To advance one step further, we have recently explored fluorescence near single nonlocal plasmonic particles by implementing the generalized nonlocal optical response (GNOR) theory [49], which also accounts for surface-enhanced Landau damping [50][51][52]. In that case, a significant decrease in fluorescence enhancement for emitters coupled to individual homogeneous noble-metal nanospheres or nanoshells has to be anticipated [53].…”

Section: Introductionmentioning

confidence: 99%

How nonlocal damping reduces plasmon-enhanced fluorescence in ultranarrow gaps

2017

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The nonclassical modification of plasmon-assisted fluorescence enhancement is theoretically explored by placing two-level dipole emitters at the narrow gaps encountered in canonical plasmonic architectures, namely dimers and trimers of different metallic nanoparticles. Through detailed simulations, in comparison with appropriate analytical modelling, it is shown that within classical electrodynamics, and for the reduced separations explored here, fluorescence enhancement factors of the order of 10 5 can be achieved, with a divergent behaviour as the particle touching regime is approached. This remarkable prediction is mainly governed by the dramatic increase in excitation rate triggered by the corresponding field enhancement inside the gaps. Nevertheless, once nonclassical corrections are included, the amplification factors decrease by up to two orders of magnitude and a saturation regime for narrower gaps is reached. These nonclassical limitations are demonstrated by simulations based on the generalised nonlocal optical response theory, which accounts in an efficient way not only for nonlocal screening, but also for the enhanced Landau damping near the metal surface. A simple strategy to introduce nonlocal corrections to the analytic solutions is also proposed. It is therefore shown that the nonlocal optical response of the metal imposes more realistic, finite upper bounds to the enhancement feasible with ultrasmall plasmonic cavities, thus providing a theoretical description closer to state of the art experiments.

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“…other hand, in the high wavenumber region, the SPs will be damped by several mechanisms such as interband transitions, electron-electron and electron-phonon interactions, and surface scattering [27][28][29][30]. In order to take these effects into consideration, further analysis with quantum mechanical treatment is needed, which we leave for future works.…”

Section: Electron-spin Current Pumped By Sps On Metallic Filmmentioning

confidence: 99%

Effects of surface plasmons on spin currents in a thin film system

Oue

Matsuo

2020

New J. Phys.

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We propose and analyze surface-plasmon-driven electron spin currents in a thin metallic film. The electron gas in the metal follows the transversely rotating electric fields of the surface plasmons (SPs), which leads to a static magnetization gradient. We consider herein SPs in a thin-film insulator-metalinsulator structure and solve the spin diffusion equation in the presence of a magnetization gradient. The results reveal that the SPs at the metal interfaces generate spin currents in the metallic film. For thinner film, the SPs become strongly hybridized, which increases the magnetization gradient and enhances the spin current. We also discuss how the spin current depends on SP wavelength and the spin-diffusion length of the metal. The polarization of the spin current can be controlled by tuning the wavelength of the SPs and/or the spin diffusion length.

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Landau damping of surface plasmons in metal nanostructures

Cited by 68 publications

References 76 publications

Surface-Assisted Carrier Excitation in Plasmonic Nanostructures

Surface-Assisted Carrier Excitation in Plasmonic Nanostructures

How nonlocal damping reduces plasmon-enhanced fluorescence in ultranarrow gaps

Effects of surface plasmons on spin currents in a thin film system

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