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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
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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
We demonstrate cavity optomagnonics using ferromagnetic spheres, observing nonreciprocal light scattering due to magnon dynamics. This opens avenues for quantum optics and spintronics applications.
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.
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