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Subpicoliter Magnetoptical Cavities

J.A. Haigh1,*, R.A. Chakalov2, and A.J. Ramsay1

  • 1Hitachi Cambridge Laboratory, Cambridge CB3 0HE, United Kingdom
  • 2Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom

  • *jh877@cam.ac.uk
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Phys. Rev. Applied 14, 044005 – Published 5 October, 2020

DOI: https://doi.org/10.1103/PhysRevApplied.14.044005

Abstract

Microwave-to-optical conversion via ferromagnetic magnons has so far been limited by the optical coupling rates achieved in millimeter-scale whispering-gallery-mode resonators. Toward overcoming this limitation, we propose and demonstrate an open magneto-optical cavity containing a thin film of yttrium iron garnet (YIG). We achieve a 0.1 pL (100μm3) optical mode volume, approximately 50 times smaller than previous devices. From this, we estimate that the magnon single-photon coupling rate is G≈50 Hz. This open-cavity design offers the prospect of wavelength-scale mode volumes, small polarization splittings, and good magneto-optical mode overlap. With achievable further improvements and optimization, efficient microwave-optical conversion and magnon cooling devices become a realistic possibility.

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Phys. Rev. Applied 14, 044005– Published 5 October, 2020
  • Received 8 July 2020
  • Revised 26 August 2020
  • Accepted 8 September 2020
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