Wave Propagation and Radiation in Gyrotropic and Anisotropic Media

Eroğlu, Abdullah

doi:10.1007/978-1-4419-6024-5

Cited by 30 publications

(18 citation statements)

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“…The calculation of a dyadic Green function for a general anisotropic medium has been a mature technique and can be obtained using various methods such as eigenfunction expansion, matrix formulation, and Fourier transform methods [44]. For more general anisotropic materials with a nonunity permeability tensor μ ik , an extra term similar to Eq.…”

Section: Thermal Radiation Between Anisotropic Materialsmentioning

confidence: 99%

Near-Field Thermal Radiation: Recent Progress and Outlook

Liu

Wang

Zhang

2015

Nanoscale and Microscale Thermophysical Engineering

130

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Any materials at temperatures higher than absolute zero emit electromagnetic waves due to the thermal fluctuations of free charges or ions. When two or more bodies at different temperatures are brought sufficiently close to each other with vacuum gap spacing smaller than the characteristic thermal wavelength, near-field radiative heat flux can exceed the far-field blackbody limit, governed by the well-known Stefan-Boltzmann law, by orders of magnitude. This article reviews the recent progress on both theoretical and experimental studies of near-field thermal radiation with an emphasis on its potential applications. Recent theoretical developments are presented, such as near-field radiation of general anisotropic materials and 2D materials, application condition of effective medium theory, and exact numerical methods for dealing with arbitrary particles or periodic nanostructures. Recent experimental achievements are also discussed, focusing on tip-plane and plane-plane configurations with various materials. The wide applications of near-field radiation are summarized in terms of thermal imaging, energy harvesting, and contactless thermal management such as modulation, rectification, and amplification. An outlook is provided on the promise of near-field thermal radiation in energy harvesting, novel thermal sources, and sensing, as well as the development of related fields such as reducing Casimir stiction, minimizing noise current, and increasing spontaneous emission rate. Challenges are also discussed, such as developing exact and fast computational techniques for complex metamaterials, understanding near-field radiation at extreme gap spacing, overcoming weak mode coupling in thermophotovoltaic (TPV) systems, measuring large-area plane-plane configuration at small gap spacing, and realizing devices based on near-field radiation.

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Section: Thermal Radiation Between Anisotropic Materialsmentioning

confidence: 99%

Near-Field Thermal Radiation: Recent Progress and Outlook

Liu

Wang

Zhang

2015

Nanoscale and Microscale Thermophysical Engineering

130

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“…However, the medium is called anisotropic when the permittivity, ε and permeability, μ, of a medium depend upon the directions of field vectors and hence, they are in tensor form. Based on Maxwell equations in an anisotropic medium the dispersion relation can be obtained by solving the matrix equation [49,50]:…”

Section: Metamaterials Medium Typesmentioning

confidence: 99%

Review on Microwave Metamaterial Structures for Near‐Field Imaging

Matbouly¹

2017

Microwave Systems and Applications

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In the past decade, metamaterials have attracted a lot of attention because of their abilities to exhibit unusual electromagnetic properties. These properties are exploited in designing functional components and devices for many potential applications. In this chapter, we review the theory and design of metamaterial structures for microwave near-field imaging/microscopy. The chapter highlights metamaterial microwave components to obtain super-resolution and manipulating subwavelength images. Moreover, a review on surface plasmons manipulation at microwave frequencies is presented as a technique to enhance the transmission for near-field microscopy. The chapter presents as well a survey on the near-field imaging instrumentation and its advances mainly for microwave and THz regimes.

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“…Applications of gyroelectric spheres are found in the electromagnetic (EM) interaction with complex property media, like garnet spheres which exhibit gyrotropic permittivity tensors [4], hyperbolic metamaterials where a periodic dielectric-metal structure gives rise to gyroelectric properties [5], or in photonic crystals which are composed by gyroelectric spheres. EM scattering in anisotropic materials is a difficult problem that has been treated for a long time in the past, and recently through a variety of approximate methods [6][7][8]. A first approximation is the Rayleigh approximation [6], where the scattering process is supposed to take place within the context of the Laplace equation, i.e., the electric field in the vicinity of the scatterer is nearly irrotational.…”

Section: Introductionmentioning

confidence: 99%

“…Increasing the number of points, a convergent result is obtained for the electric field. Another approximate method is the dyadic Green's function approach [8], whose complexity makes necessary the use of approximate This research has been funded by ER Project CfP-WP14-ER-01/Swiss Confederation-03 titled "Radio frequency wave propagation and absorption in toroidally magnetized plasmas: scattering by turbulent structures and quasilinear effects," and by the Hellenic CTF Programme.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Scattering by an Inhomogeneous Gyroelectric Sphere Using Volume Integral Equation and Orthogonal Dini-Type Basis Functions

Zouros

Kokkorakis

2015

IEEE Trans. Antennas Propagat.

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The electromagnetic scattering by an inhomogeneous gyroelectric sphere is studied in this work. The solution is constructed using the well-known electric field volume integral equation (EFVIE). The kernel which incorporates the Green's function is expanded in spherical vector wave functions, and the unknown electric field and electric displacement is expanded in spherical vector wave functions using fully orthogonal Dini-type basis functions. The permittivity tensor of the spherical object supports a continuously varying radial inhomogeneity, while its permeability is that of free space. This approach allows a fully analytical computation of the unknown matrix coefficients in special cases of homogeneous permittivity tensors. The validation of our method is performed by comparisons with published results in the literature. New numerical results are given for various continuously varying permittivity tensors.

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Wave Propagation and Radiation in Gyrotropic and Anisotropic Media

Cited by 30 publications

References 0 publications

Near-Field Thermal Radiation: Recent Progress and Outlook

Near-Field Thermal Radiation: Recent Progress and Outlook

Review on Microwave Metamaterial Structures for Near‐Field Imaging

Electromagnetic Scattering by an Inhomogeneous Gyroelectric Sphere Using Volume Integral Equation and Orthogonal Dini-Type Basis Functions

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