Nonlinear refraction in aqueous colloidal gold

Mehendale, S. C.; Mishra, S. R.; Bindra, K. S.; Laghate, M; Dhami, T. S.; Rustagi, K. C.

doi:10.1016/s0030-4018(96)00431-2

Cited by 69 publications

(19 citation statements)

References 13 publications

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“…Kronig relations) [3]. Second, nonlinear optical (NLO) properties of a nanocomposite are due to modifications in the host matrix properties, namely thermal density fluctuations known as thermal lensing effect [4], and Stark effect [5]. Obviously, NLO response of a nanocomposite depends on the volume fraction of NPs, their surface properties and dielectric environment as well.…”

Section: Optical Spectra Of Au Nanoparticlesmentioning

confidence: 99%

Spatial Coherency of Light and Nonlinear Optical Properties of Colloidal Gold Studied by CW Z-Scan Technique

Gamernyk¹,

Periv²,

Malynych³

et al. 2016

NanoWorld J

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Nonlinear refraction and absorption of a suspension of Au nanoparticles was studied by CW Z-scan at near-resonant excitation. Spatial coherency and selfinterference of the laser beam results in the emerging of ring-like interference pattern observed at the plane of the detector. The number of the interference fringes and their diameter depends on volume fraction of the nanoparticles and laser fluence at focal point. Periodical light intensity distribution across the laser beam causes modulation in the output signal that should be considered for the correct interpretation of Z-scan data.

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Section: Optical Spectra Of Au Nanoparticlesmentioning

confidence: 99%

Spatial Coherency of Light and Nonlinear Optical Properties of Colloidal Gold Studied by CW Z-Scan Technique

Gamernyk¹,

Periv²,

Malynych³

et al. 2016

NanoWorld J

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“…Such peculiar optical response arises from the excitation of the resonant oscillation of the conduction band electrons on metal nanoparticle surface by an applied electromagnetic field, which is known as surface plasmon resonance (SPR) effect [1,2]. The frequency of SPR peak and the shape of SPR band depend critically on the microstructures of metal nanoparticles such as size, distribution and shape, as well as the dielectric properties of both the metal and the surrounding medium [3]. The SPR is one unique physical feature of such nanocomposite system, which lends a great opportunity for applications in solar cells [4], photocatalyst [5], biochemical sensors [6], surface enhanced Raman spectroscopy [7] etc.…”

Section: Introductionmentioning

confidence: 99%

The study of microstructure, optical and photocatalytic properties of nanoparticles(NPs)-Cu/TiO2 films deposited by magnetron sputtering

Zhao

Sun

Zhang

et al. 2015

Journal of Alloys and Compounds

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“…In the present work, radiation with a pulse length of 55 psec was used, which excluded the possibility of the influence of the thermal effect on the results of experiments. The other, accumulative, effect is observed when radiation with a high repetition rate of pulses (several kilometers or megahertz [11]) is used, but in the present work we used radiation with a pulse repetition rate of 2 Hz, which allows a conclusion on the insignificant influence of the cumulative effects. Thus, the Kerr electronic effect is the most probable mechanism of nonlinear refraction in the specimens investigated.…”

mentioning

confidence: 95%

“…It should be noted that in deriving Eq. (2) no provision was made for the effect of thermal processes that are typical of nanosecond pulses [10] or of the radiation having a high repetition rate of pulses [11]. A characteristic feature of the reflective procedure of Z-scanning [8] as against the conventional one [12] is the use of an open aperture for investigating nonlinear refraction, whereas for the conventional, transmitting procedure, an open aperture makes it possible to analyze nonlinear absorption.…”

mentioning

confidence: 99%

“…To the possible mechanisms of nonlinear refraction in composite materials with nanoparticles of metals we may assign the Kerr electronic effect [16] as well as the acoustic [10] and accumulative [11] thermal effects. The acoustic thermal effect is determined by heat transfer from the particles heated by laser radiation into the surrounding matrix, which causes a change in the refractive index of the latter.…”

mentioning

confidence: 99%

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Nonresonant Nonlinearity of Silver Nanoparticles

Ryasnyanskii

2005

J Appl Spectrosc

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Results of experimental investigations of the process of nonlinear refraction in composite materials based on silver nanoparticles in the region far from the plasma surface resonance of the nanoparticles (λ = 1064 nm) are presented. The reflection Z-scanning technique was used for measurements, which made it possible to determine both the sign and the values of nonlinear refractive indices and real parts of the 3rd-order nonlinear susceptibility of composite materials. The mechanism responsible for the process of nonlinear refraction in specimens is discussed.Introduction. Analyzing the results of earlier investigations of the nonlinear-optical characteristics of metal nanoparticles in dielectric matrices, one can draw a conclusion on the prevailing use of lasers with wavelengths close to the absorption maximum of the surface plasma resonance of nanoparticles. In particular, for silver the surface plasma resonance is located in the 410-420-nm region [1,2]. There is no question that the nonlinear response of metal nanoparticles is manifested the most under the conditions of resonance excitation of conduction electrons, i.e., due to the strengthening of the local field at the surface plasma resonance frequencies. An example of interesting nonlinear investigations is furnished by the results of [3], in which the possibility of creating materials based on silicate glasses with silver nanoparticles that can be used as ultrafast optical commutators is evaluated. It is shown that the 3rd-order nonlinear susceptibility χ (3) of composite materials accounts for the giant value of 1.5⋅10 −7 esu when the picosecond

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Nonlinear refraction in aqueous colloidal gold

Cited by 69 publications

References 13 publications

Spatial Coherency of Light and Nonlinear Optical Properties of Colloidal Gold Studied by CW Z-Scan Technique

Spatial Coherency of Light and Nonlinear Optical Properties of Colloidal Gold Studied by CW Z-Scan Technique

The study of microstructure, optical and photocatalytic properties of nanoparticles(NPs)-Cu/TiO2 films deposited by magnetron sputtering

Nonresonant Nonlinearity of Silver Nanoparticles

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