Optical properties of aggregate particles comparable in size to the wavelength

Тишковец, В. П.; Петрова, Е. В.; Jockers, K.

doi:10.1016/j.jqsrt.2003.08.003

Cited by 75 publications

(48 citation statements)

References 23 publications

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“…The electromagnetic interaction was not studied specifically for astronomical applications. However, the results presented by Chen et al (1988); Mishchenko et al (1995); Petrova et al (2000); Kimura & Mann (2004); Tishkovets et al (2004); Kolokolova et al (2006) demonstrate the influence of the electromagnetic interaction on the light scattering characteristics of aggregates, in particular, the depolarizing effect of the electromagnetic interaction. Both Mishchenko et al (1995) and Tishkovets et al (2004) showed that the polarization decreases as monomers in the aggregate become closer, and, thus, the interaction between them increases.…”

Section: Modeling the Electromagnetic Interaction Between Monomers Inmentioning

confidence: 91%

“…However, the results presented by Chen et al (1988); Mishchenko et al (1995); Petrova et al (2000); Kimura & Mann (2004); Tishkovets et al (2004); Kolokolova et al (2006) demonstrate the influence of the electromagnetic interaction on the light scattering characteristics of aggregates, in particular, the depolarizing effect of the electromagnetic interaction. Both Mishchenko et al (1995) and Tishkovets et al (2004) showed that the polarization decreases as monomers in the aggregate become closer, and, thus, the interaction between them increases. Kimura & Mann (2004) pointed out that if the wavelength is close to the size of monomers, then only interaction between the neighbors (touching monomers) affects the scattering whereas in case of longer wavelengths more distant monomers become involved that increases the influence of interaction on the light scattering characteristics.…”

Section: Modeling the Electromagnetic Interaction Between Monomers Inmentioning

confidence: 91%

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Effects of electromagnetic interaction in the polarization of light scattered by cometary and other types of cosmic dust

Kolokolova¹,

Kimura²

2010

A&A

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Context. We study how the electromagnetic interaction between the monomers in aggregates affects the polarization of cosmic dust. Aims. We aim to show that the electromagnetic interaction depends on the porosity and composition of the aggregates and contributes significantly to the spectral gradient of polarization (polarimetric color). The results may explain the observations of some comets that demonstrated atypical negative polarimetric color in the visible and also a reverse of the positive polarimetric color to the negative one in the near-infrared. Methods. We performed computer simulations of the light scattering by aggregates consisting of spheres made of a variety of materials: transparent, absorptive, and the material similar to that of the dust in comet Halley. We studied how the number of monomers covered by the electromagnetic wave at a single period (on the light path equal to one wavelength) affects their interaction by considering linear clusters of 2 and 10 monomers of radius of 0.1 μm. Results. Electromagnetic interaction between the monomers in aggregates depolarizes the light. The interaction becomes stronger if more monomers are covered by the electromagnetic wave at a single period. Thus, the porosity of aggregates influences their polarization. The electromagnetic interaction also depends on composition and is stronger for transparent materials. Conclusions. Electromagnetic interaction between the monomers in aggregates may explain why the polarimetric color of comet dust decreases as observations move from the visible to the near-infrared since a longer wavelength covers more monomers. It may also explain why some comets exhibit negative polarimetric color even in the visible; these comets may have more compact dust. Strong electromagnetic interaction resulted either from compactness or transparency of the material can explain the negative polarimetric color of interplanetary dust and debris disks and contribute to the polarization of asteroids. In general, the spectral dependence of polarization is a promising tool for studying the properties of cosmic dust particles, particularly their porosity.

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Section: Modeling the Electromagnetic Interaction Between Monomers Inmentioning

confidence: 91%

Section: Modeling the Electromagnetic Interaction Between Monomers Inmentioning

confidence: 91%

Effects of electromagnetic interaction in the polarization of light scattered by cometary and other types of cosmic dust

Kolokolova¹,

Kimura²

2010

A&A

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“…8 and 9, it is worth mentioning that the scattering characteristics calculated for different randomly generated individual clusters composed of polydisperse particles may vary. This is caused by the limited number of composing particles, which leads to the differences in structure of the outer layers of clusters, which, in turn, has a substantial influence on the behavior of the negative branch of polarization (Tishkovets et al, 2004b). However, because of the choice of the size range of composing particles and the refractive index, all the clusters considered here, even small, show the negative branch of polarization.…”

Section: The Near-field Effect In Clustersmentioning

confidence: 95%

“…(In publications, the near field is associated with a field, the amplitude of which decreases faster than 1/ r , where r is the distance to the scatterer (Greffet and Carminati, 1998)) It is mostly noticeable in closely packed media, since its action is based on the peculiarities of the scattering of the near field when the distances between the scatterers are comparable to their sizes. Although the properties of the near-field effect have been already been substantially considered in publications (see, e.g., Tishkovets, 1998;2004a;2004b), our recent paper , where we discussed the manifestation of two mechanisms-the coherent backscattering and the near-field effect-in the scattering near opposition, faced keen criticism (Shkuratov and Zubko, 2008). Our opponents doubt the effectiveness of the scattering mechanism based on the interaction of particles in the near field.…”

Section: Introductionmentioning

confidence: 98%

Interaction of particles in the near field and opposition effects in regolith-like surfaces

2009

Self Cite

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“…Among these factors, the particle refractive index will contribute much to the measurement. If the imaginary part of the refractive index increase, the contribution of light scattered twice predominates [7]. Maria et al also found that by grain the larger the imaginary part of the refractive index, the smaller the energy density trapped within the grain [8].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Study on the Extinction Efficiency Error Caused by the Refractive Index During the Particulate Measurement

Cui¹

2007

TOASCJ

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Abstract:The quantitative errors of extinction efficiency during the particulate measurement caused by the refractive index are studied. And the quantitative results are acquired when the real part of the refractive index and the imaginary part change respectively. The change ranges of the real part are 1+0.5 i to 2+0.5 i at a 0.1 interval and 1.5+0.5 i to 1.59+0.5 i at a 0.01 interval. Another the change ranges of the imaginary part are 1.57+0.1 i to 1.57+1 i at a 0.1 i interval and 1.57+1 i to 1.57+10 i at a 1 i interval. Firstly, the result shows the extinction efficiency change is linear with the real part change of the refractive index, but not linear with the imaginary part change. Secondly, when both the real part and the imaginary part change, the extinction efficiency will go to a constant value about 2.24 with the size parameter x infinitely increasing. Thirdly, the errors are different with the change of x when the real part changes. The maximal error value is 1.168% at x =2 and the end constant value is about 0.05%. Also the extinction efficiency errors are 0.67% and 0.036% when the size of x are 1 and 20 respectively when the imaginary part changes.

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Optical properties of aggregate particles comparable in size to the wavelength

Cited by 75 publications

References 23 publications

Effects of electromagnetic interaction in the polarization of light scattered by cometary and other types of cosmic dust

Effects of electromagnetic interaction in the polarization of light scattered by cometary and other types of cosmic dust

Interaction of particles in the near field and opposition effects in regolith-like surfaces

Quantitative Study on the Extinction Efficiency Error Caused by the Refractive Index During the Particulate Measurement

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