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Polarization Dependent Scattering in Cavity Optomagnonics.

J A Haigh¹, A Nunnenkamp^2,3,4, A J Ramsay¹

¹Hitachi Cambridge Laboratory, Cambridge, CB3 0HE, United Kingdom.

Physical Review Letters

|October 15, 2021

Summary

Researchers observed polarization-dependent magnon-photon scattering in an optical microcavity. They found broadband suppression of one sideband due to interference effects, highlighting the role of the second-order Cotton-Mouton effect in optomagnonic devices.

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Area of Science:

Optomagnonics
Condensed Matter Physics
Quantum Optics

Background:

Optomagnonic devices leverage interactions between magnons (quasiparticles) and photons.
Previous studies often used large whispering gallery resonators, limiting certain effects.
Understanding polarization dependence is crucial for device design.

Purpose of the Study:

To investigate the polarization dependence of magnon-photon scattering in an optical microcavity.
To identify the underlying physical mechanisms responsible for observed scattering phenomena.
To explore the role of specific optical effects and magnon modes in thin-film geometries.

Main Methods:

Experimental investigation of magnon-photon scattering in a short-length optical microcavity.
Analysis of polarization-resolved scattering spectra.
Theoretical consideration of interference effects, including Faraday and Cotton-Mouton effects.
Inclusion of magnon mode squeezing in thin-film geometries.

Main Results:

Observed strong and broadband suppression of one sideband in cross-polarized scattering.
Attributed this suppression to interference between Faraday and second-order Cotton-Mouton effects.
Identified Damon-Eshbach surface modes as the relevant magnon modes.
Observed copolarized scattering due to the Cotton-Mouton effect.

Conclusions:

The second-order Cotton-Mouton effect plays a significant role in optomagnonic devices.
Magnon mode squeezing is essential for fully explaining cross-polarized scattering suppression.
The identified Damon-Eshbach surface modes offer potential for device applications due to nonreciprocal propagation.