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Title: THz-frequency magnon-phonon-polaritons in the collective strong-coupling regime

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. Finally, our simple yet versatile waveguide platform provides a promising avenue through which to explore ultrafast THz spintronics, quantum electrodynamics, sensing, and spectroscopic applications.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [2];  [2]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Shanghai Univ. (China)
  3. Academy of Sciences of the Czech Republic, Prague (Czech Republic)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)
OSTI Identifier:
1610519
Alternate Identifier(s):
OSTI ID: 1524127
Grant/Contract Number:  
SC0001088; CHE-1665383; 51372149; 51672171
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 125; Journal Issue: 21; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; physics

Citation Formats

Sivarajah, Prasahnt, Steinbacher, Andreas, Dastrup, Blake, Lu, Jian, Xiang, Maolin, Ren, Wei, Kamba, Stanislav, Cao, Shixun, and Nelson, Keith A. THz-frequency magnon-phonon-polaritons in the collective strong-coupling regime. United States: N. p., 2019. Web. https://doi.org/10.1063/1.5083849.
Sivarajah, Prasahnt, Steinbacher, Andreas, Dastrup, Blake, Lu, Jian, Xiang, Maolin, Ren, Wei, Kamba, Stanislav, Cao, Shixun, & Nelson, Keith A. THz-frequency magnon-phonon-polaritons in the collective strong-coupling regime. United States. https://doi.org/10.1063/1.5083849
Sivarajah, Prasahnt, Steinbacher, Andreas, Dastrup, Blake, Lu, Jian, Xiang, Maolin, Ren, Wei, Kamba, Stanislav, Cao, Shixun, and Nelson, Keith A. Mon . "THz-frequency magnon-phonon-polaritons in the collective strong-coupling regime". United States. https://doi.org/10.1063/1.5083849. https://www.osti.gov/servlets/purl/1610519.
@article{osti_1610519,
title = {THz-frequency magnon-phonon-polaritons in the collective strong-coupling regime},
author = {Sivarajah, Prasahnt and Steinbacher, Andreas and Dastrup, Blake and Lu, Jian and Xiang, Maolin and Ren, Wei and Kamba, Stanislav and Cao, Shixun and Nelson, Keith A.},
abstractNote = {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. Finally, our simple yet versatile waveguide platform provides a promising avenue through which to explore ultrafast THz spintronics, quantum electrodynamics, sensing, and spectroscopic applications.},
doi = {10.1063/1.5083849},
journal = {Journal of Applied Physics},
number = 21,
volume = 125,
place = {United States},
year = {2019},
month = {6}
}

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