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

TL;DR

This paper investigates how rotation affects the interaction energy and torque of a small dipole particle near a dielectric surface, revealing conditions for stable rotation and repulsion.

Contribution

It provides a detailed analysis of the torque and interaction energy for rotating dipoles with various orientations relative to a dielectric surface, highlighting quasistationary behavior.

Findings

Particles can rotate indefinitely without braking when aligned with the rotation axis.

Inclined dipoles can be repelled from the surface at specific rotation frequencies.

Rotation influences trapping and manipulation of nanoparticles near surfaces.

Abstract

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.