van der Waals dispersion forces in electromagnetic fields

Milonni, Peter W.; Smith, Adolph

doi:10.1103/physreva.53.3484

Cited by 65 publications

(52 citation statements)

References 7 publications

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“…Within the decade, however, a landmark paper by Burns et al [8] verified the effect experimentally, and introduced the term 'optical binding'; this work also drew attention to the long-range linearly inverse dependence on distance, tempered by an oscillatory factor. The study inspired increasingly adventurous theoretical and experimental investigations [9][10][11][12][13][14][15][16][17][18][19][20][21][22] and the development of quantum electrodynamical studies [23,24]. Mostly, attention has focused on the intensity and distance dependence of the pair forces.…”

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confidence: 99%

Optically induced potential energy landscapes

Rodríguez

2007

J. Nanophoton

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Abstract. Multi-dimensional potential energy surfaces are associated with optical binding. A detailed exploration of the available degrees of geometric freedom reveals unexpected turning points, producing intricate patterns of local force and torque. Although optical pair interactions outweigh Casimir-Polder coupling even over short distances, the forces are not always attractive. Numerous local potential minimum and maximum can be located, and mapped on contour diagrams. Islands of stability appear, and structures conducive to the formation of rings. The results, based on quantum electrodynamics, apply to optically trapped molecules, nanoparticles, microparticles and colloids.Keywords: Optical binding, optical matter, quantum electrodynamics, optical manipulation, nano-manipulation Electrically neutral molecules and larger nanoparticles, separated from each other beyond significant wavefunction overlap, generally experience weak forces of mutual attraction. Typically, such forces are associated with pair potentials characterized by an inverse sixth power dependence on inter-particle distance. In the case of molecules, the latter feature (the attractive component of a Lennard-Jones interaction) is interpreted as a dynamic coupling of fluctuating electric dipoles. Experimentally verifiable retardation effects modify the distance dependence at longer distances, exhibiting the deeply quantum electrodynamical character of the Casimir-Polder interaction [1-3] -ultimately attributable to virtual photon exchange. The additive effect of pairwise interactions between the constituents of larger particles conveys an inverse sixth power distance relationship into the Hamaker interaction [4], where it determines properties such as adhesion, wetting, multilayer adsorption and colloid flocculation [5,6].A suspicion that intense laser light might engage with virtual photon exchange, producing an optically modified potential energy surface, was first developed into theory by Thirunamachandran almost thirty years ago [7] -but the laser intensities that appeared necessary then represented a major deterrent. Within the decade, however, a landmark paper by Burns et al. [8] verified the effect experimentally, and introduced the term 'optical binding'; this work also drew attention to the long-range linearly inverse dependence on distance, tempered by an oscillatory factor. The study inspired increasingly adventurous theoretical and experimental investigations [9][10][11][12][13][14][15][16][17][18][19][20][21][22] and the development of quantum electrodynamical studies [23,24]. Mostly, attention has focused on the intensity and distance dependence of the pair forces. The pair separation is, however, only one of the geometric degrees of freedom. In this Letter, we present the first results to emerge from an investigation into the complete potential energy surfaces for optically induced interactions. Despite a relative simplicity in the field equations, a richly textured potential energy landscape emerges.For a pair of particles, B di...

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confidence: 99%

Optically induced potential energy landscapes

Rodríguez

2007

J. Nanophoton

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“…The optimization of only GTF exponents [39][40][41][42] or only GTF centers [43][44][45] has been reported. In this study, the fully variational MO (FVMO) method was applied; that is, the parameters such as GTF exponents and centers are also optimized, as well as, the LCGTF coefficients for both the electronic and nuclear GTFs.…”

Section: Methodsmentioning

confidence: 99%

Theoretical Analysis of Phase-Transition Temperature of Hydrogen-Bonded Dielectric Materials Induced by H/D Isotope Effect

Ishimoto

Tachikawa

2013

Advances in Quantum Methods and Applications in Chemistry, Physics, and Biology

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We theoretically analyzed the H/D isotope effect for phase transition temperature (T c ) and geometrical changes of hydrogen-bonded dielectric materials by using the multi-component molecular orbital method, which can take account the quantum effect of proton, deuteron, triton, and muon. Taking into account the quantum effect of proton/deuteron using the MC_MO method directly, the difference of T c , as well as, the geometry and electronic charge difference is universally elucidated. The origin of the isotope effect for hydrogen-bonded dielectric materials is from the difference of the proton/deuteron wave distributions under the anharmonicity of the potential. IntroductionThe hydrogen-bonded dielectric material is classified into the (anti-) ferroelectric materials having hydrogen bond in the crystal structure. Many hydrogen-bonded dielectric materials have been reported since the discovery of potassium dihydrogen phosphate, KH 2 PO 4 (KDP), in 1935 [1]. The hydrogen-bonded dielectric materials have various hydrogen-bonded networks such as three-, two-, one-, and zerodimensional structures [2][3][4][5].The phase transition of the hydrogen-bonded dielectric materials strongly depends on the nature of hydrogen-bonded networks. The hydrogen bond in the crystal of hydrogen-bonded dielectric materials plays an important role to control various physical properties. In particular, drastic change of the phase transition temperature (T c ) of the hydrogen-bonded dielectric materials upon replacing hydrogen atoms with deuterium is usually called the 'isotope effect'. Sometimes the difference of the T c between the hydrogen and deuterium compounds is more than 100 K. The problem of its phase transition and the large isotope effect on such physical quantities as the T c has been one of the most interesting topics in this field. Although there are many models and experimental results with respect to the isotope effect of M. Tachikawa

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“…Exploiting such interactions, new opportunities for creating optically ordered matter have indeed been demonstrated both theoretically and experimentally. [3][4][5][6][7][8][9][10] Paraxial wave equations have been adopted to describe optical binding between micron-sized spherical particles, in the presence of counterpropagating beams 11,12 , the results being analyzed in terms of the differences between the refractive indices of the spheres and those of the surrounding medium. In an analysis of particles having similar dimensions, Chaumet and Nieto-Vesperinas 13 also derived results both for isolated spheres, and for spheres near a surface.…”

Section: Introductionmentioning

confidence: 99%

Optical binding: potential energy landscapes and QED

2008

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Optical binding can be understood as a laser perturbation of intermolecular forces. Applying state-of-the-art QED theory, it is shown how light can move, twist and create ordered arrays from molecules and nanoparticles. The dependence on laser intensity, geometry and polarization are explored, and intricate potential energy landscapes are exhibited. A detailed exploration of the available degrees of geometric freedom reveals unexpected patterns of local force and torque. Numerous positions of local potential minimum and maximum can be located, and mapped on contour diagrams. Islands of stability and other structures are then identified.

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van der Waals dispersion forces in electromagnetic fields

Cited by 65 publications

References 7 publications

Optically induced potential energy landscapes

Optically induced potential energy landscapes

Theoretical Analysis of Phase-Transition Temperature of Hydrogen-Bonded Dielectric Materials Induced by H/D Isotope Effect

Optical binding: potential energy landscapes and QED

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