Subpicoliter Magnetoptical Cavities

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 yttr...

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Veröffentlicht in:Physical review applied 2020-10, Vol.14 (4), Article 044005
Hauptverfasser: Haigh, J. A., Chakalov, R. A., Ramsay, A. J.
Format: Artikel
Sprache:eng
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Zusammenfassung: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 (100 mu m(3)) optical mode volume, approximately 50 times smaller than previous devices. From this, we estimate that the magnon single-photon coupling rate is G approximate to 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.
ISSN:2331-7019
2331-7019
DOI:10.1103/PhysRevApplied.14.044005