Optimal mode matching in cavity optomagnonics

Abstract

Inelastic scattering of photons is a promising technique to manipulate magnons but it suffers from weak intrinsic coupling. We theoretically discuss an idea to increase optomagnonic coupling in optical whispering gallery mode cavities, by generalizing previous analysis to include the exchange interaction. We predict that the optomagnonic coupling constant to surface magnons in yttrium iron garnet (YIG) spheres with radius $300\mu$m can be up to $40$ times larger than that to the macrospin Kittel mode. Whereas this enhancement falls short of the requirements for magnon manipulation in YIG, nanostructuring and/or materials with larger magneto-optical constants can bridge this gap.

Comments welcome

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• Cavity Magnonics
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• Chirality as Generalized Spin-Orbit Interaction in Spintronics
• Antiferromagnetic cavity optomagnonics
• Nonreciprocal high-order sidebands induced by magnon Kerr nonlinearity
• Stationary entanglement between light and microwave via ferromagnetic magnons
• Optimal broad-band frequency conversion via a magnomechanical transducer
• Design of an optomagnonic crystal: towards optimal magnon-photon mode matching at the microscale
• Proposal for a Bell test in cavity optomagnonics
• Realization of the unidirectional amplification in a cavity magnonic system
• Protocol for generating an arbitrary quantum state of the magnetization in cavity magnonics
• Coherent pumping of high momentum magnons by light
• Waveguide cavity optomagnonics for broadband multimode microwave-to-optics conversion
• Cavity-Enhanced Optical Manipulation of Antiferromagnetic Magnon-Pairs
• Collective dynamics of domain walls: an antiferromagnetic spin texture in an optical cavity
• Sub-pico-liter magneto-optical cavities