Decoupling approximation for the nonlinear-optical response of composite media

Stroud, D.; Wood, Van E.

doi:10.1364/josab.6.000778

Cited by 176 publications

(102 citation statements)

References 31 publications

Supporting

Mentioning

100

Contrasting

Order By: Relevance

“…Another possibility is to carry out the averaging within some simple approximation. Such an approximation was first suggested by Zeng et al [12] and by Stroud and Hui [11], and later at finite frequencies by Stroud and Wood [13], who called this approach a 'nonlinear decoupling approximation' (NDA). The finite frequency problem is of great interest in the context of nonlinear optical properties of composite materials (see, e.g., [14]).…”

Section: Ema-like Approximations For Nonlinear Compositesmentioning

confidence: 99%

The effective medium approximations: Some recent developments

Stroud

1998

Superlattices and Microstructures

Self Cite

218

104

View full text Add to dashboard Cite

We provide a brief and highly selective review of the Landauer-Bruggeman effectivemedium approximation as applied to random composite media. We first discuss this approximation as applied to linear composites, i.e., to those materials in which there is a linear relation between a curl-free electric field and a divergence-free current density. We then describe extensions of this approach to random composites with cubic nonlinearities in addition to a dominant linear term, and to composites in which the components have a fluctuating conductivity ('conductivity noise'). Finally, we mention one novel application: to conductivity noise in a random composite of normal metal (N ) and perfect conductor (S). It is shown that the extension of the EMA leads to a prediction of a frequency range in which the conductivity noise has a 1/ω frequency dependence, even if the noise in the individual components is frequency independent.

show abstract

Section: Ema-like Approximations For Nonlinear Compositesmentioning

confidence: 99%

The effective medium approximations: Some recent developments

Stroud

1998

Superlattices and Microstructures

Self Cite

218

104

View full text Add to dashboard Cite

show abstract

“…A number of theories has been developed for weakly nonlinear composites [10,[13][14][15][16][17][18][19], with the focus mainly on third-order nonlinear susceptibility such as the Kerr effect. In previous works [20,21], we derived general expressions for nonlinear susceptibility for the second harmonic generation (SHG) and third harmonic generation (THG) in random composites.…”

Section: Introductionmentioning

confidence: 99%

Second-harmonic generation for a dilute suspension of coated particles

Hui

Stroud

2004

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

We derive an expression for the effective second-harmonic coefficient of a dilute suspension of coated spherical particles. It is assumed that the coating material, but not the core or the host, has a nonlinear susceptibility for second-harmonic generation (SHG). The resulting compact expression shows the various factors affecting the effective SHG coefficient. The effective SHG per unit volume of nonlinear coating material is found to be greatly enhanced at certain frequencies, corresponding to the surface plasmon resonance of the coated particles. Similar expression is also derived for a dilute suspension of coated discs. For coating materials with third-harmonic (THG) coefficient, results for the effective THG coefficients are given for the cases of coated particles and coated discs.

show abstract

“…We will come back to this point later. 495051525354 The concept of effective medium can be generalized to the nonlinear optical response of a nanocomposite material [49][50][51]. Most of the time, such materials contain nanoparticles the nonlinear susceptibility modulus of which is much larger than the dielectric host one.…”

Section: 4mentioning

confidence: 99%

“…Hence, (3) χ values of the order of 10 -8 esu and 10 -14 esu have been reported, respectively, for bulk gold [44] (or gold particles [48]) and different transparent dielectric media in the visible or near-infrared [52][53][54]. Now assuming that the metal susceptibility, (3) m χ , is identical for all particles and homogeneous inside each (decoupling approximation) the following relation can be obtained [50,51]:…”

Section: 4mentioning

confidence: 99%

Gold nanoparticle assemblies: interplay between thermal effects and optical response

et al. 2008

View full text Add to dashboard Cite

The optical response of materials based on gold nanoparticle assemblies depends on many parameters regarding both material morphology and light excitation characteristics. In this paper, the interplay between the optical and thermal responses of such media is particularly investigated under its theoretical aspect. Both conventional and original modeling approaches are presented and applied to concrete cases. We first show how the interaction of light with matrix-embedded gold nanoparticles can result in the generation of thermal excitations through different energy exchange mechanisms. We then describe how thermal processes can affect the optical response of a nanoparticle assembly. Finally, we connect both aspects and point out their involvement in the nonlinear optical response of nanocomposite media. This allows us to tackle two key issues in the field of third-order nonlinear properties of gold nanoparticles: The influence of the generalized thermal lens in the long laser pulse regime and the hot electron contribution to the gold particle intrinsic third-order susceptibility, including its spectral dispersion and intensity-dependence. Additionally, we demonstrate the possible significant influence of the heat carrier ballistic regime and phonon rarefaction in the cooling dynamics of an embedded gold nanoparticle subsequent to ultrafast pulsed laser excitation.

show abstract

Decoupling approximation for the nonlinear-optical response of composite media

Cited by 176 publications

References 31 publications

The effective medium approximations: Some recent developments

The effective medium approximations: Some recent developments

Second-harmonic generation for a dilute suspension of coated particles

Gold nanoparticle assemblies: interplay between thermal effects and optical response

Contact Info

Product

Resources

About