Radiative energy and momentum transfer for various spherical shapes: A single sphere, a bubble, a spherical shell, and a coated sphere

Zheng, Yi; Ghanekar, Alok

doi:10.1063/1.4907913

Cited by 13 publications

(6 citation statements)

References 67 publications

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“…II for the geometry as well as definition of terms), are well known from the literature for both uncoated and single-coated spheres. [68][69][70][71] The full, multilayered Mie reflection coefficients can be determined recursively in a manner similar to that of Fresnel reflection coefficients for planar stratified media. 72 The recurrence relation is given by follows naturally from Eq.…”

Section: Appendix C: Computation Of Effective Mie Reflection Coefficimentioning

confidence: 99%

Near-field thermal radiative transfer between two coated spheres

Czapla

Narayanaswamy

2017

Phys. Rev. B

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In this work, we present an expression for the near-field thermal radiative transfer between two spheres with arbitrary numbers of coatings. We numerically demonstrate that the spectrum of heat transfer between layered spheres exhibits novel features due to the newly introduced interfaces between coatings and cores. These features include broad super-Planckian peaks at non-resonant frequencies and near-field selective emission between metallic spheres with polar material coatings. Spheres with cores and coatings of two different polar materials are also shown to exceed the total conductance of homogeneous spheres in some cases.

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Section: Appendix C: Computation Of Effective Mie Reflection Coefficimentioning

confidence: 99%

Near-field thermal radiative transfer between two coated spheres

Czapla

Narayanaswamy

2017

Phys. Rev. B

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“…Fluctuational electrodynamics can be thought of as a combination of quantum mechanics, statistical physics, and macroscopic electrodynamics. Readers of this journal might be more familiar with the usage of fluctuational electrodynamics to analyze near-field effects in thermal radiative energy transfer between two objects at two different temperatures or radiative energy and momentum transfer from a single object (the other object can be considered at an infinite separation) [20]. To quantify the source for electromagnetic waves in conditions of thermal nonequilibrium, the fluctuationdissipation (FD) theorem of the second kind [21,22] is used to relate the power spectral density of the fluctuation charge density to the local temperature and the imaginary parts of the relative dielectric permittivity, ( ), and relative magnetic permeability, ( ), of the object.…”

Section: Relation Between Avg and Dyadic Green's Functionsmentioning

confidence: 99%

A Generalization of Electromagnetic Fluctuation-Induced Casimir Energy

Zheng

2015

Advances in Condensed Matter Physics

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Intermolecular forces responsible for adhesion and cohesion can be classified according to their origins; interactions between charges, ions, random dipole-random dipole (Keesom), random dipole-induced dipole (Debye) are due to electrostatic effects; covalent bonding, London dispersion forces between fluctuating dipoles, and Lewis acid-base interactions are due to quantum mechanical effects; pressure and osmotic forces are of entropic origin. Of all these interactions, the London dispersion interaction is universal and exists between all types of atoms as well as macroscopic objects. The dispersion force between macroscopic objects is called Casimir/van der Waals force. It results from alteration of the quantum and thermal fluctuations of the electrodynamic field due to the presence of interfaces and plays a significant role in the interaction between macroscopic objects at micrometer and nanometer length scales. This paper discusses how fluctuational electrodynamics can be used to determine the Casimir energy/pressure between planar multilayer objects. Though it is confirmation of the famous work of Dzyaloshinskii, Lifshitz, and Pitaevskii (DLP), we have solved the problem without having to use methods from quantum field theory that DLP resorted to. Because of this new approach, we have been able to clarify the contributions of propagating and evanescent waves to Casimir energy/pressure in dissipative media.

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“…Spectral control has been studied to affect radiative heat transfer in both the far-field as well as near-field. Customization of absorption/emission spectra is often achieved by the use of multilayer thin film structures [29], nanoparticles [30,31], dielectric mixtures [32,33], photonic crystals [34,35], 1-D/2-D gratings [36] and metamaterials [37,38]. Absorbers that utilize Fabry-Perot cavities [39,40], Salisbury screens [41] and Jaumann absorbers [42] and ultra-thin lossy thin films bounded by transparent substrate and superstate [43][44][45] have been investigated for decades.…”

Section: Introductionmentioning

confidence: 99%

Photonic Metamaterials: Controlling Nanoscale Radiative Thermal Transport

Ghanekar¹,

Tian²,

Zheng³

2018

Heat Transfer - Models, Methods and Applications

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We discuss concepts of radiative thermal diodes demonstrating dynamic control and modulation of radiative heat transfer. These concepts are analogous to electronic diodes and display high degree of asymmetry in radiative heat transfer. Change in optical properties of vanadium dioxide VO 2 ðÞ upon phase transition are exploited to influence thermal radiation. The first concept is based on a simple multi-layer structure containing a layer of VO 2 to attain dynamic optical response in the far-field regime. The active terminal of the diode changes from highly reflecting to highly absorbing upon phase transition of VO 2. In the second concept, a near-field thermal diode is considered that utilizes period gratings of VO 2. Radiative heat transfer across the near-field gap is modulated by altering tunneling of surface waves when phase change in VO 2 occurs. For minimal temperature difference of 20 K, rectification ratios have been reported and they are maximum in existing literature for comparable operating temperatures and configurations.

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Radiative energy and momentum transfer for various spherical shapes: A single sphere, a bubble, a spherical shell, and a coated sphere

Cited by 13 publications

References 67 publications

Near-field thermal radiative transfer between two coated spheres

Near-field thermal radiative transfer between two coated spheres

A Generalization of Electromagnetic Fluctuation-Induced Casimir Energy

Photonic Metamaterials: Controlling Nanoscale Radiative Thermal Transport

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