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Updated: Jul 16, 2025
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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
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Meterscale Strong Coupling between Magnons and Photons.
Jinwei Rao1, C Y Wang1, Bimu Yao1,2
1School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
Physical Review Letters
|September 22, 2023
Summary
Researchers achieved room-temperature, meterscale strong coupling between magnons and photons using an active microwave cavity. This breakthrough enables remote control of photon-magnon coupling, paving the way for cavity magnonics information networks.
Area of Science:
- Quantum optics
- Condensed matter physics
- Microwave engineering
Background:
- Strong coupling between magnons and photons is crucial for quantum information processing.
- Achieving long-range coupling in cavity magnonics has been a significant challenge.
Purpose of the Study:
- To experimentally realize meterscale strong coupling between magnons and photons at room temperature.
- To demonstrate remote control of photon-magnon coupling.
- To provide a general method for long-range strong coupling in physical systems.
Main Methods:
- Integration of a saturable gain into a microwave cavity.
- Coupling the active cavity to a magnon mode via a long coaxial cable.
- Utilizing traveling waves for remote control of coupling parameters.
Main Results:
- Experimental realization of meterscale strong coupling with coherent coupling of ~20 m and dissipative coupling of ~7.6 m.
- Demonstration of remote control over photon-magnon coupling by modulating traveling wave phase and amplitude.
- Gain compensation for cavity dissipation while preserving mediating radiation.
Conclusions:
- The developed method enables long-range strong photon-magnon coupling.
- The findings offer a generalizable approach for other physical systems.
- This work may advance the development of information networks based on cavity magnonics.
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