Nonlinear refraction of silver hydrosols during their aggregation

Карпов, С. В.; Kodirov, M. K.; Ryasnyansky, A.I.; Slabko, V. V.

doi:10.1070/qe2001v031n10abeh002072

Cited by 15 publications

(24 citation statements)

References 2 publications

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“…15 it is suggested that we deal here with dynamic plasmon resonances of silver nanoparticles whose frequency changes under the applied pulsed radiation. According to 15 , this is caused by evaporation of particles in the laser pulsed field and the formation of a rapidly expanding plasma inside which the electron concentration is decreased. In 10,29,30,31,32 a possibility of particles displacement in aggregates is shown under the action of light induced dipole (generally -multipole) forces.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, for example, in Ref. 15 it is suggested that we deal here with dynamic plasmon resonances of silver nanoparticles whose frequency changes under the applied pulsed radiation. According to 15 , this is caused by evaporation of particles in the laser pulsed field and the formation of a rapidly expanding plasma inside which the electron concentration is decreased.…”

Section: Introductionmentioning

confidence: 99%

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Processes in resonant domains of metal nanoparticle aggregates and optical nonlinearity of aggregates in pulsed laser fields

Gavrilyuk

Карпов

2009

Appl. Phys. B

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The specific optical nonlinearities inherent in aggregates of metal nanoparticles under pico-and nanosecond pulsed laser irradiation are studied in nanoparticle aggregates formed in silver hydrosols. The results of experimental studies of the correlation between the degree of aggregation of silver hydrosols and their nonlinear refraction index (n2) at the wavelengths 0.532 and 1.064 µm are discussed. The experiments revealed that n2 changes its sign at 1.064 µm as the degree of the hydrosol aggregation grows. The role of various processes occurring in resonant domains of aggregates and the kinetics of these processes under laser irradiation resulting in dynamic variation of the polarizability of aggregates are analyzed. The areas under study included the kinetics of particles displacement considering dissipative forces, heating of the particles and of the surrounding medium depending on the wavelength, intensity and duration of laser pulses. A theory of interaction of laser radiation with an elementary type domain -two bound silver nanoparticles -was developed to describe the kinetics of resonant domains photomodification in aggregates. This theory takes into account thermal, elastic, electrostatic and light induced effects. The experimental results on laser photomodification of silver particle aggregates are discussed in the context of our model. These results include photochromic and nonlinear optical effects, in particular, the nonlinear refraction and nonlinear absorption.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Processes in resonant domains of metal nanoparticle aggregates and optical nonlinearity of aggregates in pulsed laser fields

Gavrilyuk

Карпов

2009

Appl. Phys. B

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“…2, 3, 4, and 5) include the parameters in Eqs. (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11). In contrast to the previous works, changes in the characteristics of domains are studied under the action of pulsed laser radiation with the duration 1000 times longer (τ=20 ns) than in [6,7] at the wavelength corresponding to the maximum of the extinction (plasmonic) spectrum.…”

Section: Resultsmentioning

confidence: 99%

“…Note that a large number of experiments on nonlinear refraction and nonlinear absorption in nanocolloids of noble metals were carried out with nanosecond and picosecond laser pulses for the same wavelengths [9,10]. It was found that these experimental results were very different.…”

Section: Introductionmentioning

confidence: 98%

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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“…In particular, the sign of nonlinear refraction of Ag nanocolloids depends on the aggregation state and a number of particles in aggregates. [40,41] In our paper, we carried out a numerical study based on the developed theoretical models. The obtained results allow ones to estimate whether the polydispersity of colloidal aggregates typical for experimental nanocolloids makes them unsuitable for photochromic media and whether this factor impairs the spectral selectivity of the photochromic reactions.…”

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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Nonlinear refraction of silver hydrosols during their aggregation

Cited by 15 publications

References 2 publications

Processes in resonant domains of metal nanoparticle aggregates and optical nonlinearity of aggregates in pulsed laser fields

Processes in resonant domains of metal nanoparticle aggregates and optical nonlinearity of aggregates in pulsed laser fields

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

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

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