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Cavity Optomagnonics with Spin-Orbit Coupled Photons.

A Osada¹, R Hisatomi¹, A Noguchi¹

¹Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Meguro-ku, Tokyo 153-8904, Japan.

Physical Review Letters

|June 18, 2016

Summary

This summary is machine-generated.

We demonstrate cavity optomagnonics using ferromagnetic spheres, observing nonreciprocal light scattering due to magnon dynamics. This opens avenues for quantum optics and spintronics applications.

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Area of Science:

Physics
Quantum Optics
Spintronics

Background:

Cavity optomagnonics explores light-matter interactions mediated by magnons.
Whispering gallery modes (WGMs) in dielectric resonators confine photons.
Ferromagnetic materials host magnons, the quanta of spin waves.

Purpose of the Study:

To experimentally implement a cavity optomagnonic system.
To investigate magnon-induced Brillouin scattering of light.
To explore nonreciprocity and asymmetry in optical signals.

Main Methods:

Utilizing a ferromagnetic sphere supporting optical WGMs and magnons.
Analyzing sideband signals from light scattering.
Applying principles of spin-orbit coupling and birefringence.

Main Results:

Observed pronounced nonreciprocity and asymmetry in sideband signals.
Identified angular-momentum selection rules governing the scattering process.
Linked phenomena to spin-orbit coupling, geometrical birefringence, and magnon dynamics.

Conclusions:

The implemented system exhibits unique optical nonreciprocity.
Spin-orbit coupling and magnon time-reversal symmetry breaking are key.
Potential applications exist at the intersection of quantum optics and spintronics.