Coupled harmonic oscillator model to describe surface-mode mediated heat transfer

Sasihithlu, Karthik

doi:10.1117/1.jpe.9.032709

Cited by 4 publications

(8 citation statements)

References 32 publications

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“…The effect of orientation factor on the NFHT between molecules is also considered. We have confirmed that this model in the dipole limit tallies with the results of NFHT between two dipoles as predicted from fluctuational electrodynamics principles and the discrepancy of a constant factor which was reported in an earlier work [32] has been accounted for by considering degeneracy of eigenmodes. It is expected that the expression of NFHT between molecules derived in this work will be used for comparison with experimental measurements.…”

Section: Discussionsupporting

confidence: 90%

“…In addition the results shown in Ref. [32] differed from FE predictions by a constant factor. In this work we account for this discrepancy by taking into account degeneracy in eigenmodes and in NFHT Between Molecules we discuss the effect of orientation factor between dipoles on NFHT between molecules.…”

Section: Introductionmentioning

confidence: 83%

“…The spectral density of the forcing function, S F (ω, T), which is proportional to F(ω, T)| 2 can be found by equating the thermal energy content of the oscillator in the absence of coupling with that predicted from Bose-Einstein distribution as detailed in Ref. [32]. We find this to be:…”

Section: Coupled Harmonic Oscillator Modelmentioning

confidence: 93%

“…The equations of motion of two coupled harmonic oscillators of unit mass, with same natural frequency ω 0 , damping constant γ, and coupling constant ω 2 0 ξ, with one of the oscillators connected to a heat bath at temperature T and the other to a heat bath at temperature 0 K, as shown in Figure 1, is given by [31][32][33]38]:…”

Section: Coupled Harmonic Oscillator Modelmentioning

confidence: 99%

“…The NFHT between two dipoles is then extended to predict that between two molecules by incorporating their oscillator strengths. This procedure has been previously applied to estimate the NHFT between two nanoparticles [30] and two planar surfaces [31,32]. The model has the added advantage that it can be extended to cases where the local thermal equilibrium condition considered in FE is not valid -such as estimating dynamic heat transfer between objects [30,33].…”

Section: Introductionmentioning

confidence: 99%

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Coupling Parameters for Modeling the Near-Field Heat Transfer Between Molecules

Sasihithlu¹

2021

Front. Phys.

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The behavior of near-field heat transfer between molecules at gaps which are small compared to wavelength of light is greatly influenced by non-radiative dipole-dipole interactions between the molecules. Here we derive the coupling parameters and estimate the near-field heat transfer between two molecules using coupled Drude oscillators. The predictions from this model are verified with results from standard fluctuational electrodynamics principles. The effect of orientation factor of the dipole moments in the molecules traditionally taken into consideration for analysis of resonance energy transfer between molecules but hitherto overlooked for near-field heat transfer is also discussed.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 83%

Section: Coupled Harmonic Oscillator Modelmentioning

confidence: 93%

Section: Coupled Harmonic Oscillator Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coupling Parameters for Modeling the Near-Field Heat Transfer Between Molecules

Sasihithlu¹

2021

Front. Phys.

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Near-field radiative heat transfer in many-body systems

et al. 2021

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Many-body physics aims to understand emergent properties of systems made of many interacting objects. This article reviews recent progress on the topic of radiative heat transfer in many-body systems consisting of thermal emitters interacting in the near-field regime. Near-field radiative heat transfer is a rapidly emerging field of research in which the cooperative behavior of emitters gives rise to peculiar effects which can be exploited to control heat flow at the nanoscale. Using an extension of the standard Polder and van Hove stochastic formalism to deal with thermally generated fields in N -body systems, along with their mutual interactions through multiple scattering, a generalized Landauer-like theory is derived to describe heat exchange mediated by thermal photons in arbitrary reciprocal and non-reciprocal multi-terminal systems. In this review, we use this formalism to address both transport and dynamics in these systems from a unified perspective. Our discussion covers: (i) the description of non-additivity of heat flux and its related effects, including fundamental limits as well as the role of nanostructuring and material choice, (ii) the study of equilibrium states and multistable states, (iii) the relaxation dynamics (thermalization) toward local and global equilibria, (iv) the analysis of heat transport regimes in ordered and disordered systems comprised of a large number of objects, density and range of interactions, and (v) the description of thermomagnetic effects in magneto-optical systems and heat transport mechanisms in non-Hermitian many-body systems. We conclude this review by listing outstanding challenges and promising future research directions.

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Special Section Guest Editorial: Thermal Photonics in Energy

2019

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From cooking fire to modern gas turbines and electronics cooling, the ability to control heat has been closely linked with human development and energy utilization. One promising way to manipulate heat is to control the spectrum, power density, and directionality of thermal radiation, which is a primary mode of heat transfer particularly at high temperatures and in vacuum. This capability could unlock breakthroughs in numerous energy technologies ranging from power generation to personalized cooling.This special section of the Journal of Photonics for Energy, titled "Thermal Photonics for Energy," captures ongoing efforts to enhance radiative heat transfer, such that it dominates other modes of heat transfer, and to precisely control its spectrum and direction. New developments in materials, fabrication techniques, and simulation tools over the past few decades have paved the way for the field of thermal photonics where at least one characteristic length is comparable with or smaller than the wavelength of thermal radiation, as highlighted by recent reviews such as "Heat is the new light," 1 "Heat meets light at the nanoscale," 2 and "Thermal photonics and energy applications." 3 The topics in this special section cover a range of fundamentals, including how orientation of 2D materials affects near-field radiative heat transfer, 4 enhancing light absorption in singlelayer 2D materials, 5 theory of near-field coupling, 6,7 and control of narrowband emission using nano-antennas 8 and metamaterials. 9 The section also features more application-oriented investigations into metasurface thermophotovoltaic cells, 10 near-field effects in thermoradiative 11 and thermophotonic 12 energy conversion, spectral splitting for space applications, 13 windows for energy-efficiency, 14 and materials for passive radiative cooling. 15,16 Mini-reviews on magnetothermoplasmonics 17 and thermophotovoltaic emitters 18 complete this special section on thermal photonics in energy.

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Coupled harmonic oscillator model to describe surface-mode mediated heat transfer

Cited by 4 publications

References 32 publications

Coupling Parameters for Modeling the Near-Field Heat Transfer Between Molecules

Coupling Parameters for Modeling the Near-Field Heat Transfer Between Molecules

Near-field radiative heat transfer in many-body systems

Special Section Guest Editorial: Thermal Photonics in Energy

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