On the theory of optical properties of fractal clusters

Perminov, S. V.; Rautian, S. G.; Safonov, V. P.

doi:10.1134/1.1757669

Cited by 12 publications

(16 citation statements)

References 16 publications

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“…where ξ n are statistically independent random variables evenly distributed in the interval [−A, A] and ω/ ω F = 1. The factors f n in this case are no longer positive-definite and the transformation of Ref 34. can not be applied.…”

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confidence: 99%

Propagation of surface plasmons in ordered and disordered chains of metal nanospheres

Markel

Sarychev²

2007

Phys. Rev. B

155

182

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We report a numerical investigation of surface plasmon (SP) propagation in ordered and disordered linear chains of metal nanospheres. In our simulations, SPs are excited at one end of a chain by a near-field tip. We then find numerically the SP amplitude as a function of propagation distance. Two types of SPs are discovered. The first SP, which we call the ordinary or quasistatic, is mediated by short-range, near-field electromagnetic interaction in the chain. This excitation is strongly affected by Ohmic losses in the metal and by disorder in the chain. These two effects result in spatial decay of the quasistatic SP by means of absorptive and radiative losses, respectively.The second SP is mediated by longer range, far-field interaction of nanospheres. We refer to this SP as the extraordinary or non-quasistatic. The non-quasistatic SP can not be effectively excited by a near-field probe due to the small integral weight of the associated spectral line. Because of that, at small propagation distances, this SP is dominated by the quasistatic SP. However, the non-quasistatic SP is affected by Ohmic and radiative losses to a much smaller extent than the quasistatic one. Because of that, the non-quasistatic SP becomes dominant sufficiently far from the exciting tip and can propagate with little further losses of energy to remarkable distances.The unique physical properties of the non-quasistatic SP can be utilized in all-optical integrated photonic systems.

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confidence: 99%

Propagation of surface plasmons in ordered and disordered chains of metal nanospheres

Markel

Sarychev²

2007

Phys. Rev. B

155

182

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“…We have used both the coupled-multipole method with the maximum multipole order L = 40 and the dipole approximation with and without phenomenological rescaling. 26 Previous studies of the effects of polydispersity [22][23][24] have been limited to the DA and did not account for the presence of adlayers. It was found in Refs.…”

Section: Discussionmentioning

confidence: 99%

“…In particular, we will see below that, in certain cases, the polydispersity of particles (with adlayers taken into account) can increase the relative weight or the extent of the redshifted spectral resonances, contrary to the previous findings. [22][23][24] Another reason that a closer look at the problem may be desirable is the use of the DA in the previous studies. [22][23][24] It is well known that the DA does not reproduce the experimentally observed long-wavelength tail of the extinction spectra, at least not without the introduction of phenomenological geometrical rescaling.…”

Section: Introductionmentioning

confidence: 99%

“…[22][23][24] Another reason that a closer look at the problem may be desirable is the use of the DA in the previous studies. [22][23][24] It is well known that the DA does not reproduce the experimentally observed long-wavelength tail of the extinction spectra, at least not without the introduction of phenomenological geometrical rescaling. 26 The inaccuracy of the DA for closely spaced particles has been well documented.…”

Section: Introductionmentioning

confidence: 99%

“…Perminov et al have studied the problem numerically using the dipole approximation (DA) for two neighboring spheres 22 and for more complicated multiparticle aggregates. 23 In these references, multiple scattering and plasmonic resonances were included into consideration. The positions and oscillator strengths of these resonances are very sensitive to the separation and radii of neighboring nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

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Effects of size polydispersity on the extinction spectra of colloidal nanoparticle aggregates

et al. 2012

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We investigate the effect of particle polydispersity on the optical extinction spectra of colloidal aggregates of spherical metallic (silver) nanoparticles, taking into account the realistic interparticle gaps caused by layers of stabilizing polymer adsorbed on the metal surface (adlayers). The spectra of computer-generated aggregates are computed using two different methods. The coupled-multipole method is used in the quasistatic approximation and the coupled-dipole method beyond the quasistatics. The latter approach is applicable if the interparticle gaps are sufficiently wide relative to the particle radii. Simulations are performed for two different particle size distribution functions (bimodal and Gaussian), varying the number of particles per aggregate, and different distribution functions of the interparticle gap width. The strong influence of the latter factor on the spectra is demonstrated and investigated in detail. We investigate the effect of particle polydispersity on the optical extinction spectra of colloidal aggregates of spherical metallic (silver) nanoparticles, taking into account the realistic interparticle gaps caused by layers of stabilizing polymer adsorbed on the metal surface (adlayers). The spectra of computer-generated aggregates are computed using two different methods. The coupled-multipole method is used in the quasistatic approximation and the coupled-dipole method beyond the quasistatics. The latter approach is applicable if the interparticle gaps are sufficiently wide relative to the particle radii. Simulations are performed for two different particle size distribution functions (bimodal and Gaussian), varying the number of particles per aggregate, and different distribution functions of the interparticle gap width. The strong influence of the latter factor on the spectra is demonstrated and investigated in detail. Disciplines Biomedical Engineering and Bioengineering

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Tunable Dichroic Self-Affine Thin Films

Naeimi

Miri

2011

J. Phys. Chem. C

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We study the optical properties of nanostructured self-affine thin films. We use the coupled-dipole equations to describe the interaction of the external electromagnetic wave with nanoparticles. We find that the particle size dispersion can be invoked to tailor the spectrum of local field enhancement and optical dichroism. We also propose self-affine thin films of vanadium dioxide (VO 2 ) as temperature-tunable dichroic devices.

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On the theory of optical properties of fractal clusters

Cited by 12 publications

References 16 publications

Propagation of surface plasmons in ordered and disordered chains of metal nanospheres

Propagation of surface plasmons in ordered and disordered chains of metal nanospheres

Effects of size polydispersity on the extinction spectra of colloidal nanoparticle aggregates

Tunable Dichroic Self-Affine Thin Films

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