Shedding light onto topological insulator beads: perspectives for optical tweezing application

TL;DR

This paper explores how topological insulator beads interact with electromagnetic radiation, revealing a net force due to the topological magnetoelectric effect that could enhance optical tweezing techniques.

Contribution

It introduces a classical optics analysis of TI beads showing a net force from TMEE, proposing new applications in optical manipulation.

Findings

Net force proportional to fine structure constant and incident power

Constant acceleration of TI beads under electromagnetic radiation

Potential for improved optical tweezing applications

Abstract

The interaction of electromagnetic radiation with a spheric-type three-dimensional topological insulator (TI) bead is described within classical optics framework. By virtue of the topological magnetoelectric effect (TMEE) experienced by reflected and transmitted rays at the TI surface, there appears a net constant force on the spherical bead which is proportional to the fine structure constant times the incident radiation power. Such an uniform dynamics (constant acceleration) may be particularly useful for optical tweeezing techniques, for instance, to investigate a DNA strip or a membrane piece under stretching as well as to displace a tiny object by means of purely optical control.