Radiation scattering by finite dielectric cyclinders

Vereshchagin, V. G.; Дынич, Р. А.; Ponyavina, A. N.

doi:10.1007/bf02680479

Cited by 4 publications

(5 citation statements)

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“…However, even if the values listed in Table I are reasonable great care must be taken when comparing these values with the other literature data. 13 This is because the obtained excitation bands ͑discussed in the next paragraph͒ can be distorted by photonics effects induced by the porous matrix, 15,16 which should also be taken into account when considering absolute values describing excitation ͑de-cay͒ spectra of Tb ions in similar matrices. Such a detailed discussion related to this issue will be given in our next paper.…”

Section: Resultsmentioning

confidence: 99%

Influence of Annealing on Excitation of Terbium Luminescence in YAlO[sub 3] Films Deposited onto Porous Anodic Alumina

Podhorodecki

Bański

Misiewicz

et al. 2010

J. Electrochem. Soc.

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Terbium-doped yttrium-aluminum oxide films were synthesized by spin-on deposition on porous anodic alumina grown on a silicon wafer and annealed from 400 to 1100°C. An influence of the annealing temperature on the terbium photoluminescence ͑PL͒ was studied using two-dimensional PL excitation and time-resolved spectroscopy. Further, a comparison of thermal quenching data for the most intensive 5 D 4 → 7 F 5 luminescence band of Tb 3+ ions was performed for 10-300 K. From the resultant data, the mechanisms of Tb excitation and its dependence on the annealing conditions are proposed and discussed.

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Section: Resultsmentioning

confidence: 99%

Influence of Annealing on Excitation of Terbium Luminescence in YAlO[sub 3] Films Deposited onto Porous Anodic Alumina

Podhorodecki

Bański

Misiewicz

et al. 2010

J. Electrochem. Soc.

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“…There is no an analytic solution of the scattering problem by the finite dielectric cylinder. Moreover, the numerical methods [4,5,6] are complicated when the aspect ratio is large. From the other hand, the scattering amplitude by the infinite cylinder is expressed analytically in a closed form [7,8].…”

Section: Introductionmentioning

confidence: 99%

Extinction by the long dielectric needles

Cherkas

2017

Optik

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Electromagnetic wave extinction by the very long but finite dielectric needle is compared with that by the infinite dielectric cylinder for an oblique incidence of the electromagnetic wave. It is shown that the renormalized Hankel functions without the logarithmic terms should be used for the calculation of the extinction per unit length of the infinite dielectric cylinder to apply it for extinction calculations by the finite dielectric cylinder.Comment: 12 pages, Mathematica notbooks associated with this article can be found, at http://dx.doi.org/10.1016/j.ijleo.2017.04.04

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“…It should be noted that DDs of separate cylinders were exceedingly sensitive to their geometric dimensions and dielectric properties and to the radiation wavelength. For example, it was found [3] that the DD was stretched forward upon decreasing the wavelength of the incident radiation. Figure 2 shows DDs of separate cylinders as functions of incident radiation wavelength and cylinder dielectric permeability.…”

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confidence: 98%

“…4. Directional diagram of a multimer of seven cylinders of diameter 100 nm and length 1500 nm; radius of the circle on which the cylinder centers are situated in the multimer, 140 (1, 3) and 100 nm (2, 4); cylinder refractive index n = 1.76 (1, 2) and 1.59 (3,4); λ = 300 nm.…”

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confidence: 99%

“…For example, this class of problems includes the spectral characteristics of selective optical elements based on channeled and columnar dielectric media that are produced by electrochemical oxidation of metallic films [1][2][3]. Films of anodized aluminum that are a matrix of aluminum oxide penetrated almost completely by cylindrical pores oriented perpendicular to the sample surface are the most common examples of these.…”

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Modelling the characteristics of electromagnetic radiation scattering by an ordered assembly of dielectric cylinders

2012

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535.36:621.373 Angular dependences of electromagnetic radiation scattered by separate finite dielectric cylinders and their ordered assemblies have been numerically simulated using a volume integral equation formalism. Dependences of directional diagrams on optical-geometric parameters of both the separate finite cylinders and their spatial ordering were studied. It is shown that collective effects of a coherent nature in the assembly of spatially ordered cylinders result in a scattered radiation angular distribution that differs strongly from that obtained for a system of cylinders that are not electrodynamically coupled.Introduction. The problem of controlling directional diagrams (DDs) of sources and transformers of electromagnetic radiation is one of the critical problems of modern photonics and radiophysics. The propagation and scattering of electromagnetic radiation can also be controlled by using multi-component systems formed by electrodynamically coupled components (elementary scatters). Electromagntic waves scattered by the elements of such spatially ordered structures are typically highly coherent. As a result, collective interference effects play a decisive role in forming the spectral characteristics and DDs. For example, photonic crystals with periodic structures of various dimensions are of great interest. Interference of multiply scattered waves in photonic crystals can cause spectral and spatial-frequency bands to form. The propagation of electromagnetic radiation in these is completely forbidden or considerably suppressed [1].Two-dimensional photonic crystals consisting of cylinders of finite length present significant promise in many practically important instances. For example, this class of problems includes the spectral characteristics of selective optical elements based on channeled and columnar dielectric media that are produced by electrochemical oxidation of metallic films [1][2][3]. Films of anodized aluminum that are a matrix of aluminum oxide penetrated almost completely by cylindrical pores oriented perpendicular to the sample surface are the most common examples of these. It was found that the structural parameters, matrix materials, and filler can be varied in order to control transmission and reflectance spectra of such systems. Another important task is the development of methods for adjusting the angular characteristics of radiation by selecting the sample microphysical parameters for purposes of photonics and opto-electronics and for optimization of radiofrequency devices. The technical requirements for miniaturization of the devices (size reduction) make it necessary to study assemblies of a finite number of electrodynamically coupled objects.The goal of the present work was to model DDs and to compare the angular distributions of radiation scattered by separate cylinders and multimers formed by them, i.e., systems of several cylinders. Multimers of ordered assemblies of seven cylinders parallel to each other, the bases of which were located in a single plane, were examine...

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Radiation scattering by finite dielectric cyclinders

Cited by 4 publications

References 13 publications

Influence of Annealing on Excitation of Terbium Luminescence in YAlO[sub 3] Films Deposited onto Porous Anodic Alumina

Influence of Annealing on Excitation of Terbium Luminescence in YAlO[sub 3] Films Deposited onto Porous Anodic Alumina

Extinction by the long dielectric needles

Modelling the characteristics of electromagnetic radiation scattering by an ordered assembly of dielectric cylinders

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