Near-field energy transfer between nanoparticles modulated by coupled multipolar modes

Becerril, David; Noguez, Cecilia

doi:10.1103/physrevb.99.045418

Cited by 25 publications

(15 citation statements)

References 49 publications

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“…Many-body radiative heat transfer theory integrates fluctuating thermal currents into Maxwell's equations to describe electromagnetic interactions between particles modeled as point dipoles. The foundations of this theory were introduced in the early 2010s for spherical nanoparticles by Ben-Abdallah et al [3] and Messina et al [10], and subsequent research has adapted the theory for anisotropic particles [12], magnetic polarization [14,15], core-shell particles [17], and point multipoles [18]. A similar approach has been developed by Edalatpour and Francoeur [20][21][22] for a numerically exact method of describing radiative transfer between arbitrary volume-discretized bodies, known as the T-DDA.…”

Section: Introductionmentioning

confidence: 99%

Thermal radiation in systems of many dipoles

et al. 2019

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Systems of many nanoparticles or volume-discretized bodies exhibit collective radiative properties that could be used for enhanced, guided, or tunable thermal radiation. These are commonly treated as assemblies of point dipoles with interactions described by Maxwell's equations and thermal fluctuations correlated by the fluctuation-dissipation theorem. Here, we unify different theoretical descriptions of these systems and provide a complete derivation of many-dipole thermal radiation, showing that the correct use of the fluctuation-dissipation theorem depends on the definitions of fluctuating and induced dipole moments. We formulate a method to calculate the diffusive radiative thermal conductivity of arbitrary collections of nanoparticles; this allows the comparison of thermal radiation to other heat transfer modes and across different material systems. We calculate the radiative thermal conductivity of ordered and disordered arrays of SiC and SiO2 nanoparticles and show that thermal radiation can significantly contribute to thermal transport in these systems. We validate our calculations by comparison to the exact solution for a one-dimensional particle chain, and we demonstrate that the dipolar approximation significantly underpredicts the exact results at separation distances less than the particle radius.

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Section: Introductionmentioning

confidence: 99%

Thermal radiation in systems of many dipoles

et al. 2019

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“…Hence the multi-tip SThM platform can be modeled by simple radiating dipoles provide their separation distance is large enough to make the contribution of multipoles negligeable. Typically this condition is satisfied [10][11][12] when the separation distances (center to center) is larger than 3R. Under these assumptions the optical behavior of any arbitrary multi-tip setup composed by N tips can be described by the interaction of fluctuating dipoles associated to each nanoemitter.…”

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confidence: 99%

Multitip Near-Field Scanning Thermal Microscopy

Ben‐Abdallah

2019

Phys. Rev. Lett.

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A theory is presented to describe the heat-flux radiated in near-field regime by a set of interacting nanoemitters held at different temperatures in vacuum or above a solid surface. We show that this thermal energy can be focused and even amplified in spots that are much smaller than those obtained with a single thermal source. We also demonstrate the possibility to locally pump heat using specific geometrical configurations. These many body effects pave the way to a multi-tip near-field scanning thermal microscopy which could find broad applications in the fields of nanoscale thermal management, heat-assisted data recording, nanoscale thermal imaging, heat capacity measurements and infrared spectroscopy of nano-objects. PACS numbers: 44.40.+a, 05.40.-a, 03.50.DeHeat flux focusing radiated by a hot object at temperature T is limited in far-field regime by the diffraction to λ th /2 where λ th = c/k B T is the thermal wavelength associated to this source. However at subwavelength distance from the source the situation can radically change. The near-field scanning themal microscope (SThM) [1][2][3][4][5] which is the non-contact version of conventional scanning thermal microscope (STM) [6,7] can achieve a local heating at submicrometric scale with heat sources close to the ambiant temperature using the tunneling of non-radiative thermal photons (i.e. evanescent waves). This near-field technology is among others the current paradigm of hard-disk-drive writing technology which is based on the so called heat-assisted magnetic recording [8,9].

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“…We will assume that the particles are so small that we can describe them as dipoles with a polarizability α. This assumption is valid for particles much smaller than the dominant thermal wavelength which is about 10 µm in our case and if the distances d between the particles and z between the particles and the substrate are at least 4R [45,46]. The particles and the substrate are made of a magneto-optical material supporting localized and surface resonances in the spectral window important for heat exchange at temperatures around 300 K. In this work we chose InSb for the particles and for the substrate.…”

Section: Heat Fluxmentioning

confidence: 99%

Thermal rectification and spin-spin coupling of nonreciprocal localized and surface modes

Ott

Biehs

2020

Phys. Rev. B

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We study the rectification of near-field radiative heat transfer between two InSb nano-particles due to the presence of non-reciprocal surface modes in a nearby InSb sample when an external magnetic field is applied and its dependence on the magnetic field strength. We reveal the spin-spin coupling mechanism of the localized particle resonances and the surface mode resonances which is substantiated by the directional heat flux in the given setup. We discuss further the interplay of the frequency shift, the propagation length, and local density of states on the strength and directionality of the rectification as well as the non-reciprocal heating effect of the nanoparticles. arXiv:2002.08752v1 [cond-mat.mes-hall]

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Near-field energy transfer between nanoparticles modulated by coupled multipolar modes

Cited by 25 publications

References 49 publications

Thermal radiation in systems of many dipoles

Thermal radiation in systems of many dipoles

Multitip Near-Field Scanning Thermal Microscopy

Thermal rectification and spin-spin coupling of nonreciprocal localized and surface modes

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