Polarization effects in nanoaggregates of silver caused by local and nonlocal nonlinear-optical responses

Drachev, Vladimir P.; Perminov, S. V.; Rautian, S. G.; Safonov, V. P.; Khaliullin, Eldar N.

doi:10.1134/1.1484986

Cited by 18 publications

(10 citation statements)

References 10 publications

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“…As can be seen from Eqs. (1), GNOR constitutes an extension of the traditional hydrodynamic model for nonlocal plasmonics [62][63][64][65][66], with the addition of a diffusion term that accounts in a semiclassical way for surface-enhanced Landau damping. We note that a diffusivelike term originating from the bulk is already included in the standard hydrodynamic model, but at optical frequencies it is practically negligible [67].…”

Section: Theoretical Backgroundmentioning

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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Section: Theoretical Backgroundmentioning

confidence: 99%

How nonlocal damping reduces plasmon-enhanced fluorescence in ultranarrow gaps

2017

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“…The possibility of light-induced shift of particles in aggregates is discussed in Refs. [34]- [36]. Approaching of irradiated particles in a domain is accompanied by the spectral shift of the surface plasmon resonances.…”

Section: Introductionmentioning

confidence: 99%

Restructuring of plasmonic nanoparticle aggregates with arbitrary particle size distribution in pulsed laser fields

Ershov¹,

Gavrilyuk²,

Карпов³

et al. 2016

Chinese Phys. B

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We have studied processes of interaction of pulsed laser radiation with resonant groups of plasmonic nanoparticles (resonant domains) in large colloidal nanoparticle aggregates having different interparticle gaps and particle size distributions. These processes are responsible for the origin of nonlinear optical effects and photochromic reactions in multiparticle aggregates. To describe photo-induced transformations in resonant domains and alterations in their absorption spectra remaining after the pulse action, we introduce the factor of spectral photomodification. Based on calculation of changes in thermodynamic, mechanical, and optical characteristics of the domains, the histograms of the spectrum photomodification factor have been obtained for various interparticle gaps, an average particle size, and the degree of polydispersity. Variations in spectra have been analyzed depending on the intensity of laser radiation and various combinations of size characteristics of domains. The obtained results can be used to predict manifestation of photochromic effects in composite materials containing different plasmonic nanoparticle aggregates in pulsed laser fields.

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“…The proposed model reproduces the most realistic pattern of the action of pulsed laser radiation on a resonant domain (compared to the existing optodynamic models [6,7]) and includes the previously neglected physical processes and phenomena in the models [18][19][20]. It should be noted that, unlike [6,7], we use a smaller value of the binding energy in the adlayer U=0.47 eVadjusted based on the experimental data for the elasticity modulus of casein (as the adlayer material).…”

Section: Modelmentioning

confidence: 99%

“…In our case, the coincidence with the resonant frequency is determined by the maximum value of light-induced dipole moments of particles in a domain. An important factor affecting the optodynamic processes in a resonance domain and the domain optical characteristics is the local environment of particles in the aggregate [8,[15][16][17][18]. We will study several types of resonance domains with different local environment (mono-and polydisperse dimers and trimers, Fig.…”

Section: Modelmentioning

confidence: 99%

Plasmonic Nanoparticle Aggregates in High-Intensity Laser Fields: Effect of Pulse Duration

2015

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We use an optodynamic model to study the interaction of pulsed laser radiation of different duration with monoand polydisperse dimers and trimers of plasmonic nanoparticles as resonant domains of colloid Ag multiparticle aggregates. A comparative analysis of the influence of pulse duration on the kinetic characteristics of domains accompanied by the change in their local structure was carried out taking into account the intensity of incident radiation. The obtained results explain the reasons for laser photochromic reactions in materials containing colloidal aggregates of plasmonic nanoparticles.

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Polarization effects in nanoaggregates of silver caused by local and nonlocal nonlinear-optical responses

Cited by 18 publications

References 10 publications

How nonlocal damping reduces plasmon-enhanced fluorescence in ultranarrow gaps

How nonlocal damping reduces plasmon-enhanced fluorescence in ultranarrow gaps

Restructuring of plasmonic nanoparticle aggregates with arbitrary particle size distribution in pulsed laser fields

Plasmonic Nanoparticle Aggregates in High-Intensity Laser Fields: Effect of Pulse Duration

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