Abstract
We put forward the concept of an optomagnonic crystal: a periodically patterned structure at the microscale based on a magnetic dielectric, which can co-localize magnon and photon modes. The co-localization in small volumes can result in large values of the photon-magnon coupling at the single quanta level, which opens perspectives for quantum information processing and quantum conversion schemes with these systems. We study theoretically a simple geometry consisting of a one-dimensional array of holes with an abrupt defect, considering the ferrimagnet yttrium iron garnet (YIG) as the basis material. We show that both magnon and photon modes can be localized at the defect, and use symmetry arguments to select an optimal pair of modes in order to maximize the coupling. We show that an optomagnonic coupling in the kHz range is achievable in this geometry, and discuss possible optimization routes in order to improve both coupling strengths and optical losses.4 MoreReceived 8 December 2020Revised 11 February 2021Accepted 3 March 2021DOI:https://doi.org/10.1103/PhysRevResearch.3.013277Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasFaraday effectMagneto-optical effectNanophotonicsPhysical SystemsNanostructuresTechniquesMicromagnetic modelingCondensed Matter, Materials & Applied Physics
Highlights
Progress in fundamental quantum physics has established a basis for developing new technologies in the fields of information processing, secure communication, and quantum enhanced sensing
We study theoretically a simple geometry consisting of a one-dimensional array of holes with an abrupt defect, considering the ferrimagnet yttrium iron garnet (YIG) as the basis material
In order to tackle these issues, we propose an optomagnonic array at the microscale, which acts simultaneously as a photonic crystal [47], determining the optical properties of the structure, and as a magnonic crystal [48,49,50] with tailored magnetostatic modes
Summary
Progress in fundamental quantum physics has established a basis for developing new technologies in the fields of information processing, secure communication, and quantum enhanced sensing. An ultimate form of spintronics is the new field of quantum magnonics [19,20], where superconducting quantum circuits couple, via microwave fields in a cavity, coherently to magnetic collective excitations (magnons) [21,22] Such systems are promising for generating and characterizing nonclassical quantum magnon states [19,23,24,25], quantum thermometry protocols [26], and for developing microwave-to-optical quantum transducers for quantum information processing [27,28]. The coupling, still remains too small for applications This is due to the large size of the used YIG spheres (the coupling increases as the volume of the cavity decreases [34]), with radius of the order of hundreds of microns, and, concomitantly, the large difference between the optical and the magnetic mode volume (Vmag Vopt), by which most of the magnetic mode volume does not participate in the coupling. The Appendixes contains further details of the analytic calculations and of the simulations
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