Light propagation and magnon-photon coupling in optically dispersive magnetic media

• URL: http://arxiv.org/abs/2111.05851v1
• Date: Wed, 10 Nov 2021 18:59:52 GMT
• Title: Light propagation and magnon-photon coupling in optically dispersive magnetic media
• Authors: V. A. S. V. Bittencourt and I. Liberal and S. Viola Kusminskiy
• Abstract summary: We present a derivation of the magnon-photon coupling Hamiltonian in dispersive media. We show that the coupling of magnons to plane-wave non-degenerate modes vanishes at specific frequencies due to polarization selection rules tuned by dispersion. Our results pave the way for the design of dispersive optomagnonic systems.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Achieving strong coupling between light and matter excitations in hybrid systems is a benchmark for the implementation of quantum technologies. We recently proposed [arXiv:2110.02984] that strong single-particle coupling between magnons and light can be realized in a magnetized epsilon-near-zero (ENZ) medium, in which magneto-optical effects are enhanced. Here we present a detailed derivation of the magnon-photon coupling Hamiltonian in dispersive media both for degenerate and non-degenerate optical modes, and show the enhancement of the coupling near the ENZ frequency. Moreover, we show that the coupling of magnons to plane-wave non-degenerate Voigt modes vanishes at specific frequencies due to polarization selection rules tuned by dispersion. Finally, we present specific results using a Lorentz dispersion model. Our results pave the way for the design of dispersive optomagnonic systems, providing a general theoretical framework for describing engineering ENZ-based optomagnonic systems.

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