T-matrix approach for calculating local fields around clusters of rotated spheroids

Vargas, William E.; Cruz, Luis; Fonseca, Luis F.; Gómez, Manuel González

doi:10.1364/ao.32.002164

Cited by 10 publications

(7 citation statements)

References 20 publications

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“…However, it has so far been unclear whether this approach can be employed to describe light scattering from whole blood, with an inter-particle distance estimated to approximately three times the RBC radius (center to center). By comparing the far field originating from a single sphere, or spheroid on the one hand and from bispheres, or clusters of spheroids on the other, Mishchenko et al [23] and Vargas et al [37] have shown that for a center-to-center inter-particle distance of more than four times the maximum radius, yields independent scattering, when the axial ratios of the scattering objects are unity, or close to unity, and the size of the particles is small. However, it is difficult to draw any firm conclusions concerning the light scattering by highly asymmetric, large RBCs from their results.…”

Section: Discussionmentioning

confidence: 99%

T-matrix computations of light scattering by red blood cells

Nilsson¹,

Alsholm²,

Karlsson³

et al. 1998

Appl. Opt.

119

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Section: Discussionmentioning

confidence: 99%

T-matrix computations of light scattering by red blood cells

Nilsson¹,

Alsholm²,

Karlsson³

et al. 1998

Appl. Opt.

119

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“…(15) and (16), and this can apparently can only be done if the smallest circumscribing spheres around each scatterer do not overlap. Lastly we point out that, contrary to Cruz et al [22,23], who used the global T-matrix approach and consequently were limited to evaluating the local field intensity outside the smallest circumscribing spheres of the entire system, the use of the centered T-matrix formalism allows one to readily calculate the field at any point of space outside of the smallest circumscribing sphere of each scatterer [24].…”

Section: Orientation Average Expression Of the Total External Fielmentioning

confidence: 92%

Local field intensity in aggregates illuminated by diffuse light: T matrix approach

Auger

Stout

2008

Appl. Opt.

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We derive an analytic expression for the local field intensity in an aggregate of particles illuminated by diffuse light (T matrix formalism). To be precise, the diffuse light average is obtained by averaging the electromagnetic response from plane waves over all possible incident field direction polarizations. We applied this new averaging formula to analyze variations in the electromagnetic couplings between two isotropic spheres as a function of their separation distance. The numerical calculations were performed with the recursive centered T matrix algorithm (RCTMA), one of the known analytical solutions of the multiple scattering equation of light. Illustrative calculations clearly demonstrate that diffuse averaging has a large smoothing effect on the strong angular and local variations in the field intensities that are omnipresent in orientation fixed calculations. We believe that this formalism can be a valuable tool in the analysis of electromagnetic couplings in dense random heterogeneous media, in which light propagation is dominated by a scalar diffusion behavior.

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“…The first one results from the broad bandwidth required for the compensator (20 nm), which would require an extremely small grating length. Linearly chirped gratings can alleviate this inconvenience, because the filter bandwidth increases with the grating length [8]. Nevertheless, the actual fabrication possibilities would require one to place at least two gratings in series in order to obtain a 20-nm-bandwidth notch filter.…”

Section: Equalizer Designmentioning

confidence: 99%

“…The second drawback is that these gratings present an undesired spectral side lobe that can compromise the equalizer performance. Fortunately, these can be greatly suppressed by apodizing the fiber gratings [8]. In our case we propose a Blackman apodization, because its fabrication with high-quality spectral characteristics has been recently demonstrated [7].…”

Section: Equalizer Designmentioning

confidence: 99%

Numerical T-matrix solution for polarized scattering from a cluster of spatially oriented, nonspherical scatterers

Jin

Huang

1996

Microw. Opt. Technol. Lett.

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A small low-cost anechoic chamber has been described. It has proved useful for undergraduate teaching and research applications. The method of chamber construction lends itself to the demonstration of antenna performance and measurement techniques and facilitates relocation if required. The total cost of both the chamber and positioner was found to be less than f3,000 sterling.By combining the chamber and positioner with a network analyzer and personal computer, an automated antenna measurement system that allows for the determination of antenna radiation patterns has been developed.Chamber characterization tests have indicated a reflectivity level of better than -52 dB in the range 18-30 GHz, implying a worst-case error of the order of 1 dB for pattern measurements within a dynamic range of 35-40 dB.It is felt that the chamber, and the associated measurement arrangement, offers a low-cost and simple method of assisting student understanding of antenna concepts, and at the same time provides an extremely useful facility for accurate antenna measurements, specifically in the range 18-30 GHz, for research applications. Received 2-1-96Microwave and Optical Technology Letters, 12/3, 150-154 ABSTRACT Because scatterer size is comparable with wauelength, a rigorous T-matrix solution is used to calculate scattering from the scatterer. When scatteren are nonuniformly clustered, the coherency of collective scattering f.om scatterers must be taken into account. We employ a multiplescattering formulation of the T-matrix method to develop numerical simulations of polarized scattering porn a cluster of spatially oriented, nonspherical particles. Numerical simulations are made for polarized bistatic backscattering, and for functional dependence on the particle shape, spatial distribution, orientation, and other parameters. Numerical results show (a) variations of complex scattering amplitude functions of clustered particles due to collective multiple scattering, (b) the scattering difference between clustered nonspherical and spherical particles, (c) the difference between collective& coherent and independent scattering; and (d) the effect due to the orientation distribution of clustered nonspherical particles. Numerical calculations compared well with the experimental data of a two-sphere cluster. ABSTRACTWe propose and design a novel EDFA equalizer based on a transmissive filter composed of two or more linearly chirped apodized fiber gratings (LCAFGs). 0 1996 John Wiley & Sons, Inc.

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T-matrix approach for calculating local fields around clusters of rotated spheroids

Cited by 10 publications

References 20 publications

T-matrix computations of light scattering by red blood cells

T-matrix computations of light scattering by red blood cells

Local field intensity in aggregates illuminated by diffuse light: T matrix approach

Numerical T-matrix solution for polarized scattering from a cluster of spatially oriented, nonspherical scatterers

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