Nonlinear optical properties of nanocomposite materials

Boyd, Robert W.; Gehr, Ronald; Fischer, George L.; Sipe, J. E.

doi:10.1088/0963-9659/5/5/005

Cited by 102 publications

(48 citation statements)

References 13 publications

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“…In contrast, the HCM nonlinear susceptibility parameter χ x Ω , and to a lesser extent χ y Ω , exceeds the nonlinear susceptibility of component phase a for a wide range of values of f a . This nonlinearity enhancement phenomenon, and its potential for technological exploitation, have been reported on previously for both isotropic [7,9,29,30] and anisotropic [10,28] HCMs. The anisotropy reflected by the constitutive parameters, and the nonlinearity enhancement, stems from the ellipsoidal geometry of the component phase particles.…”

Section: Numerical Studiessupporting

confidence: 73%

Depolarization regions of nonzero volume for anisotropic, cubically nonlinear, homogenized nanocomposites

Cui

Mackay

2007

J. Nanophoton

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An implementation of the strong-permittivity-fluctuation theory (SPFT) is presented in order to estimate the constitutive parameters of a homogenized composite material (HCM) which is both cubically nonlinear and anisotropic. Unlike conventional approaches to homogenization, the particles which comprise the component material phases are herein assumed to be small but not vanishingly small. The influence of particle size on the estimates of the HCM constitutive parameters is illustrated by means of a representative numerical example. It is observed that, by taking the nonzero particle size into consideration, attenuation is predicted and nonlinearity enhancement is somewhat diminished. In these respects, the effect of particle size is similar to that of correlation length within the bilocally-approximated SPFT.

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Section: Numerical Studiessupporting

confidence: 73%

Depolarization regions of nonzero volume for anisotropic, cubically nonlinear, homogenized nanocomposites

Cui

Mackay

2007

J. Nanophoton

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“…At the plasmon resonance, multiphoton processes may be amplifi ed by the enhanced electric fi eld within or in proximity of metallic nanoparticles. For example, it has been observed that size-dependent third harmonic generation (THG) is feasible in gold nanoparticles [29,46,47] . It is interesting to note that THG is induced at the particle surface, with a nonlinear dipole proportional to the area of the sphere rather than to its volume [29] , due to the small skin depth of metals and the corresponding small fi eld penetration.…”

Section: Plasmonic Nanoantennas With Enhanced Nonlinear Responsementioning

confidence: 99%

Enhanced nonlinearities using plasmonic nanoantennas

2012

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In this paper, we review and discuss how nanoantennas may be used to largely enhance the nonlinear response of optical materials. For single nanoantennas, there have been tremendous advancements in understanding how to exploit the local fi eld enhancement to boost the nonlinear susceptibility at the surface or sharp edges of plasmonic metals. After an overview of the work in this area, we discuss the possibility of controlling the optical nonlinear response using nanocircuit concepts and of signifi cantly enhancing various nonlinear optical processes using planar arrays of plasmonic nanoantennas loaded with χ (2) or χ (3) nonlinear optical materials, forming ultrathin, nanometer-scale nonlinear metasurfaces, as optical nanodevices. We describe how this concept may be used to boost the effi ciency of nonlinear wave mixing and optical bistability, due to the large local fi eld enhancement at the nonlinear nanoloads associated with the plasmonic features of suitably tailored nanoantenna designs. We fi nally discuss three exciting applications of the proposed nonlinear metasurface: dramatically-enhanced frequency conversion effi ciency, effi cient phase-conjugation for super-resolution imaging and large optical bistabilities.

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“…Im n ͉, we use the effective permittivity 46 ef f = h + CoFe , where h and CoFe are the permittivity of the host dielectric and CoFe, respectively. CoFe ϳ͑−1 − i͒ ϫ 10 3 -10 4 ͑see, e.g., Ref.…”

Section: Re Nmentioning

confidence: 99%

Negative permeability due to exchange spin-wave resonances in thin magnetic films with surface pinning

2010

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We report a theory of the effective permeability of multilayered metamaterials containing thin ferromagnetic layers with magnetization pinned on either one or both surfaces. Because of the pinning and small film thickness, the lowest frequency magnetic resonances are due to nonuniform exchange spin waves with frequencies far above those expected for uniform ferromagnetic resonance in known magnetic materials. Yet, the coupling of the nonuniform spin-wave modes to the electromagnetic field is shown to be strong enough to lead, for magnetic parameters characteristic for conventional transition metal alloys, to negative values of the effective permeability at frequencies of several hundred gigahertzs. The permittivity of metals is already negative in this frequency range. Hence, this system represents a negative refractive index metamaterial at subterahertz frequencies. The ways by which to maximize the frequency and the strength of the negative magnetic response are analyzed.

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Nonlinear optical properties of nanocomposite materials

Cited by 102 publications

References 13 publications

Depolarization regions of nonzero volume for anisotropic, cubically nonlinear, homogenized nanocomposites

Depolarization regions of nonzero volume for anisotropic, cubically nonlinear, homogenized nanocomposites

Enhanced nonlinearities using plasmonic nanoantennas

Negative permeability due to exchange spin-wave resonances in thin magnetic films with surface pinning

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