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

Abstract

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.

12 pages, 2 figures