Optomagnetic forces on YIG/YFeO3 microspheres levitated in chiral hollow-core photonic crystal fibre

TL;DR

This paper investigates a novel magnetooptomechanical system where magnetic YIG/YFeO3 microspheres are levitated in a chiral hollow-core photonic crystal fibre, enabling optical control and observation of magnetization dynamics.

Contribution

It introduces a new levitation platform for magnetic particles with integrated optomagnetic control within a photonic crystal fibre.

Findings

Optical torque induces rotation of the particle.

Magnetization vector rotates under external magnetic field.

Platform enables studies of optomagnetic physics with levitated particles.

Abstract

We explore a magnetooptomechanical system consisting of a single magnetic microparticle optically levitated within the core of a helically twisted single-ring hollow-core photonic crystal fibre. We use newly-developed magnetic particles that have a core of antiferromagnetic yttrium-ortho-ferrite (YFeO3) and a shell of ferrimagnetic YIG (Y3Fe5O12) approximately 50 nm thick. Using a 632.8 nm probe beam, we observe optical-torque-induced rotation of the particle and rotation of the magnetization vector in presence of an external static magnetic field. This one-of-a-kind platform opens a path to novel investigations of optomagnetic physics with levitated magnetic particles.