Fluctuation Electromagnetic Interaction Between Rotating Nanoparticle and Near-Field of the Surface

Fluctuation electromagnetic interaction between a small rotating particle and a polarizable surface produces the friction torque on the particle, changes the attraction force (van -der -Waals force) and the rate of heat exchange in this system. In this paper we consider the case where the rotation axis is parallel to the surface. We present general theoretical basis allowing to obtain characteristics of the interaction at an arbitrary orientation of the rotation axis. In comparison to the case where the rotation axis is perpendicular to the surface (arXiv: 1208.2603), the obtained integral expressions for the friction torque, interaction energy and heating rate have different numerical coefficients. Numerical estimations are given in the case Au (particle)- Au(surface) and SiC (particle)-SiC (surface).Comment: 16 pages,4 figure

A uniformly moving polarizable particle in a thermal radiation field with arbitrary spin direction

We have generalized our recent results (Arm. J. Phys., 2014) relating to the dynamics, heating and radiation of a small rotating polarizable particle moving in a thermal radiation field in the case of arbitrary spin orientation. General expressions for the tangential force, heating rate and intensity of thermal and nonthermal radiation are given. It is shown that the intensity of nonthermal radiation does not depend on the linear velocity and spin direction of the particle.Comment: 6 pages, 1 figur

Fluctuation-Electromagnetic Interaction: Effects of Uniform Motion, Rotation, and Thermal Disequilibrium

In this work, we give a consistent review of recent analytical results of reference character related to the fluctuation-electromagnetic interactions in the systems particle-vacuum, particle-surface, particle-particle, and surface-surface. Effects of dynamical, rotational, and thermal disequilibrium are considered. The applications of these results are important in atomic and molecular physics, quantum field theory and nanotechnology.Comment: 21 pages, 5 figure

Impact of Rotation on the Interaction of a Small Dipole Particle with Dielectric Surface

We have calculated components of the torque and the interaction energy of rotating dipole particle in the case where the rotation axis is perpendicular to the surface and the dipole axis is inclined to it. An important property of this system is its quasistationarity. When the dipole axis coincides with the rotation axis, the particle does not experience braking and may revolve for infinitely long time. When the dipole axis is inclined to the surface, a situation is possible where the particle is repelled off the surface provided that the rotation frequency is tuned to the absorption resonance of the surface. The established effects are important in trapping and manipulating rotating nanoparticles close to the surface.Comment: 8 pages, 3 figure

Fluctuation-electromagnetic interaction of a small particle with evanescent modes of the surface: impact of translational motion and rotation

Based on the fluctuation-electromagnetic theory, we have calculated tangential (frictional) and normal forces, radiation heat flux and frictional torque on a small rotating particle moving at a nonrelativistic velocity close to a smooth featureless surface. The particle and surface are characterized by different temperatures corresponding to the local thermodynamic equilibrium in their own reference frames.Comment: 9 pages, 3 figure

Dynamic van der Waals Interaction of a Moving Atom with the Walls of a Flat Slit

A general expression was obtained for the dynamic energy of the van der Waals interaction of a neutral atom with a flat slit whose walls are characterized by a frequency-dependent dielectric permittivity. The interaction of cesium atoms with the walls of metallic (Au) and dielectric (SiC) slits id analyzed numerically at speeds of 1 E04 to 10 E07 m/s. As the speed of atoms grows, the dynamic potentials near the walls become substantially smaller in magnitude than static potentials, but, in the intermediate region, the former exceed the latter by a factor of 1.5-2.0 m/s in a specific range of speeds.Comment: 5 pages, 3 figure

Rotating Particle in the Near Field of the Surface at Arbitrary Direction of Angular Velocity Vector

We study the fluctuation-electromagnetic interaction between a small rotating particle with an arbitrary direction of angular velocity vector and evanescent field of the heated surface, and obtain the general expressions for the force of attraction, rate of heating and components of torque. The particle rotation dynamics is analyzed. It is shown that during most time of motion the particle slows down provided that a quasiequilibrium thermal state has been reached, while at any initial direction of the angular velocity vector it tends to orient perpendicular to the surface with spin direction depending on the initial conditions. Moreover, the angular velocity vector executes precessional motion around surface normal.Comment: 12 pages, 2 figure

On Thermal Vacuum Radiation of Nanoparticles and Their Ensembles

Radiant emittance of dimers and ensembles of particles consisting of gold, graphite and silica glass nanoparticles in vacuum is studied numerically based on the fluctuation-electromagnetic theory. The presence of neighboring particles of the same temperature causes an oscillating character of radiant emittance (per one particle) depending on the particle size, interparticle distance and temperature. We conclude that an ensemble of particles could be a much more intense source of thermal radiation than an equivalent solid body with the same outer surface area. Alternatively, when the neighboring particles create a significant screening effect (silica), an ensemble of particles could be a very good heat protector.Comment: 14 pages, 13 figure

Radiation and Heating of Rotating Neutral Particle in Close Vicinity to the Surface of Transparent Dielectric

We have calculated the intensity of electromagnetic radiation from particles rotating in close vicinity to a transparent dielectric plate. The radiation is a result of quantum and thermal friction occurring during particle rotation, while the driving factor of radiation is a decrease in the kinetic energy of particle. The characteristic frequency of radiation is determined by the angular velocity and the temperature of the plate and surrounding vacuum background. These results are challenging for experimental verification in future.Comment: Several formulas and typos were corrected; submitted to Physica Scripta; 13 pages, 5 figure

On Cherenkov Friction and Radiation of a Neutral Polarizable Particle Moving Parallel to a Transparent Dielectric Plate

We have obtained general expressions for the intensity of radiation, decelerating force, the rate of heating and acceleration of a small polarizable particle under the conditions of Cherenkov friction: at relativistic motion parallel to the surface of thick transparent dielectric plate. Comparison with the results of other authors is given.Comment: 7 pages, 1 figur