Some problems in the theory of van der Waals forces

Barash, Yu. S.; Ginzburg, Vitalii L.

doi:10.3367/ufnr.0143.198407a.0345

Cited by 86 publications

(37 citation statements)

References 21 publications

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“…It is, therefore, of principal importance for experiments on atom-fiber interactions to evaluate the contributions of basic physical mechanisms to the asymmetry of the fluorescent excitation spectrum, rather than the effects of a dirty surface. For clean surfaces, such basic mechanisms include the van der Waals and Casimir-Polder interactions (see, for example, review paper [16]). …”

Section: Introductionmentioning

confidence: 99%

Spectral distribution of atomic fluorescence coupled into an optical nanofibre

Russell

Gleeson

Minogin

et al. 2009

J. Phys. B: At. Mol. Opt. Phys.

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We analyse the lineshape of the fluorescence emitted by a cloud of optically excited cold atoms and coupled into an optical nanofibre. We examine the efficiency of the fluorescence coupling and describe the asymmetry of the lineshape caused by the redshifts arising from both the van der Waals and Casimir–Polder interaction of the atoms with the surface of the optical nanofibre. We compare the contributions of the van der Waals and Casimir–Polder redshifts and show that the lineshape of the fluorescence coupled into an optical nanofibre is, basically, influenced by the van der Waals redshift and is characterized by a long tail on the red side of the spectrum. We conclude that a measurement of the lineshape of the coupled fluorescence could be used to characterize the strength of the interaction of atoms with dielectric surfaces and for the detection of atoms using nanofibres.

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Section: Introductionmentioning

confidence: 99%

Spectral distribution of atomic fluorescence coupled into an optical nanofibre

Russell

Gleeson

Minogin

et al. 2009

J. Phys. B: At. Mol. Opt. Phys.

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show abstract

“…188 For instance, several simplifying arguments have been shown to lead to dimensionally correct expressions for the Casimir force 189,190 but even the "simple theory of van der Waals forces between bodies" 191 is fraught with delicate issues of physical interpretation, which shall not be analyzed here. 161,180,192 A mathematically straightforward approach, based on assigning a standard zero-point harmonic oscillator energy equal to 1 2 ω to every electromagnetic field mode of angular frequency ω allowed by classical mode analysis, yields the following result for the total van der Waals potential energy at temperature T = 0 K of two semi-infinite, parallel, dielectric slabs separated by a gap of width s and overlapping over an area S: 161,[193][194][195] …”

Section: B Lifshitz Theorymentioning

confidence: 99%

Nanopropulsion from High-Energy Particle Beams via Dispersion Forces in Nanotubes

Pinto¹

2012

48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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Here we show for the first time that the van der Waals forces which act on the inner cores of multiwalled nanotubes can be altered to produce high-energy, high-luminosity neutral beams of nano-shuttles sliding inside the outer shells until they are ejected. This novel principle of nanotube core acceleration is based on a nanoscale implementation of dispersion force manipulation originally introduced and then developed both theoretically and experimentally by the author in micro-electromechanical systems (MEMS). In analogy with electromagnetic neutral particle acceleration, the van der Waals force, which has been experimentally observed to "retract" partially extruded cores inside the outer nanotube shells at extremely high speeds, is modulated in order to transfer a net amount of kinetic energy to the accelerated beam. Since dispersion forces are a dominant interaction at typical interlayer distances ≈ 0.34 nm, and sliding frictional forces are relatively small, the resulting final speed of the ejected shells can exceed vcore,fin 10 km/s. Technologies for the synthesis, fabrication, and uncapping of dense arrays of parallel, telescoping, multiwalled nanotubes have been already demonstrated to yield surface densities 10 10 cm −2 and individual nanotube lengths 10 cm have been demonstrated. Therefore, as the technology becomes fully developed, the resulting net thrust and specific impulse of a nanopropulsion device based on this approach can be shown to decisively exceed that of other existing lowthrust technologies. Additional advantages include the neutrality of ejecta, the potential for a tight integration of the propulsive system with on-chip digital management, and system versatility to accommodate drastically different mission profiles.

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“…The problem of polarization of an atom above a dielectric or metal substrate was considered by several authors [3,4,5,6,7,8,9]. The general conclusion is that the dipole moment of an atom induced by the substrate decreases as the fourth power of the distance from the atom to the surface.…”

Section: Introductionmentioning

confidence: 99%

Non-stationary Thermal Electromotive Force Generated by Third Sound

Shevchenko

Konstantinov

2018

J Low Temp Phys

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It is predicted that oscillations of temperature during propagation of third sound in a thin superfluid film cause appearance of an alternating electric field in the surrounding space (a peculiar non-stationary thermoelectric effect). The magnitude of this field depends significantly on the substrate type and the method of its coating. It is shown that the differential thermal EMF (the ratio of electric potential amplitude to the film temperature amplitude) can exceed such one in metals and reach 10 −4 V/K.

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Some problems in the theory of van der Waals forces

Cited by 86 publications

References 21 publications

Spectral distribution of atomic fluorescence coupled into an optical nanofibre

Spectral distribution of atomic fluorescence coupled into an optical nanofibre

Nanopropulsion from High-Energy Particle Beams via Dispersion Forces in Nanotubes

Non-stationary Thermal Electromotive Force Generated by Third Sound

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