On short‐range enhancement of Van‐der‐Waals forces

Makhnovets, K. A.; Kolezhuk, A. K.

doi:10.1002/mawe.201600461

Cited by 5 publications

(9 citation statements)

References 21 publications

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“…This confirms the interpretation ofṼ eq as the linear response function, as it appears in a fluctuation dissipation theorem with the noise in Eq. (24). Eqs.…”

Section: Equilibrium Fluctuations and Rytov Currentsmentioning

confidence: 99%

“…Equilibrium Casimir forces have been studied from a field theoretical perspective [22], focusing on the situation of a nonlinear material immersed between two bodies, while Van der Waals forces for objects with nonlinear polarizability were analyzed in Refs. [23][24][25]. A generalization of the framework of FE to nonlinear materials was performed in Ref.…”

Section: Introductionmentioning

confidence: 99%

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Fluctuational electrodynamics for nonlinear materials in and out of thermal equilibrium

Soo

Krüger

2018

Phys. Rev. B

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We develop fluctuational electrodynamics for media with nonlinear optical response in and out of thermal equilibrium. Starting from the stochastic nonlinear Helmholtz equation and using the fluctuation dissipation theorem, we obtain perturbatively a deterministic nonlinear Helmholtz equation for the average field, the physical linear response, as well as the fluctuations and Rytov currents. We show that the effects of nonlinear optics, in or out of thermal equilibrium, can be taken into account with an effective, system-aware dielectric function. We discuss the heat radiation of a planar, nonlinear surface, showing that Kirchhoff's must be applied carefully. We find that the spectral emissivity of a nonlinear nanosphere can in principle be negative, implying the possibility of heat flow reversal for specific frequencies.

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“…This confirms the interpretation ofṼ eq as the linear response function, as it appears in a fluctuation dissipation theorem with the noise in Eq. (24). Eqs.…”

Section: Equilibrium Fluctuations and Rytov Currentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fluctuational electrodynamics for nonlinear materials in and out of thermal equilibrium

Soo

Krüger

2018

Phys. Rev. B

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“…At large distances R >> R 0 (s << 1), one can expand square roots in (9), and obtain the standard 3 1 R dependence for the van der Waals potential, obtained by Lennard-Jones for interaction between inert gas atom and metallic surface [11][12][13]:…”

Section: Model and Its Analysis In Harmonic Approximationmentioning

confidence: 99%

“…This implies the necessity to take into account the nonlinear polarizability, which would lead to stabilization of the system. A similar setup, considering interaction of a nonlinearly polarizable ellipsoidal nanoparticle with a surface or with another nanoparticle has been recently studied in several articles [7][8][9]. According to the results of Refs.…”

Section: Introductionmentioning

confidence: 99%

“…[7,8] have been taken into account only perturbatively. In our previous paper [9], we have considered interaction between two point-like nanoparticles with giant polarizability, and have concluded that a careful treatment of nonlinearity does not lead to repulsive forces: on the contrary, the van der Waals force is strongly enhanced at distances less or about R 0 , remaining purely attractive at the same time. In this paper, we show that essentially the same conclusion remains valid in the case of a particle interacting with a surface.…”

Section: Introductionmentioning

confidence: 99%

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Van der Waals interaction between surface and particle with giant polarizability

Makhnovets¹

2016

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. We show that a nanoparticle with a "giant" polarizability α (i.e., with the polarizability volume 0 4πε α = α′ significantly exceeding the particle volume) placed in the vicinity of a surface experiences a strongly increased van der Waals force at distances comparable or smaller than the characteristic scale ( ). At distances close to R 0 , the oscillation mode of the particle dipole moment softens, so nonlinear polarizability must be taken into account to describe the particle-surface interaction. It is shown that a proper treatment of nonlinear effects results in the van der Waals force that is free of divergences and repulsive contributions.

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Particles with nonlinear electric response: Suppressing van der Waals forces by an external field

2017

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We study the classical thermal component of Casimir, or van der Waals, forces between point particles with highly anharmonic dipole Hamiltonians when they are subjected to an external electric field. Using a model for which the individual dipole moments saturate in a strong field (a model that mimics the charges in a neutral, perfectly conducting sphere), we find that the resulting Casimir force depends strongly on the strength of the field, as demonstrated by analytical results. For a certain angle between external field and center to center axis, the fluctuation force can be tuned and suppressed to arbitrarily small values. We compare the forces between these anharmonic particles to those between harmonic ones, and also provide a simple formula for asymptotically large external fields, which we expect to be generally valid for the case of saturating dipole moments.

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On short‐range enhancement of Van‐der‐Waals forces

Cited by 5 publications

References 21 publications

Fluctuational electrodynamics for nonlinear materials in and out of thermal equilibrium

Fluctuational electrodynamics for nonlinear materials in and out of thermal equilibrium

Van der Waals interaction between surface and particle with giant polarizability

Particles with nonlinear electric response: Suppressing van der Waals forces by an external field

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