THz-frequency magnon-phonon-polaritons in the collective strong-coupling regime
Name
1611.01814.pdf
Description
Submitted version
Size
4.19 MB
Format
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Checksum (MD5)
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Author(s)
Sivarajah, Prasahnt
Steinbacher, Andreas E
Dastrup, Blake
Lu, Jian
Xiang, Maolin
Ren, Wei
Kamba, Stanislav
Cao, Shixun
Nelson, Keith Adam
Date Issued
June 3, 2019
Journal
Journal of Applied Physics
Publisher
AIP Publishing
Citation
Sivarajah, Prasahnt et al. "THz-frequency magnon-phonon-polaritons in the collective strong-coupling regime." Journal of Applied Physics 125 (2019): 213103 © 2019 Author(s)
Version
Original manuscript
Abstract
Strong coupling between light and matter occurs when the two interact such that new hybrid modes, the so-called polaritons, are formed. Here, we report on the strong coupling of both the electric and the magnetic degrees of freedom to an ultrafast terahertz (THz) frequency electromagnetic wave. In our system, optical phonons in a slab of ferroelectric lithium niobate are strongly coupled to a THz electric field to form phonon-polaritons, which are simultaneously strongly coupled to magnons in an adjacent slab of canted antiferromagnetic erbium orthoferrite via the magnetic-field component of the same THz pulse. We juxtapose experimental results of bare slabs consisting of the two materials with a photonic crystal cavity, consisting of a two-dimensional array of air holes cut into the hybrid slab. In both cases, the strong coupling leads to the formation of new magnon-phonon-polariton modes, which we experimentally observe in the time domain as a normal-mode beating and which corresponds in the frequency domain to an avoided crossing. Our simple yet versatile waveguide platform provides a promising avenue through which to explore ultrafast THz spintronics, quantum electrodynamics, sensing, and spectroscopic applications. Keywords: electromagnetism; terahertz spectroscopy; magnons; photonic crystals; spintronics; ferroelectric materials; crystalline solids; magnetic materials; phonons
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1063/1.5083849
