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Gigantic Tellegen responses in metamaterials.
Qingdong Yang1, Xinhua Wen1, Zhongfu Li1
1New Cornerstone Science Laboratory, Department of Physics, University of Hong Kong, 999077, Hong Kong, China.
Nature Communications
|January 2, 2025
Summary
Researchers created Tellegen metamaterials in the microwave region. This breakthrough enables nonreciprocal photonic devices and offers a new platform for studying axion physics.
Area of Science:
- Condensed matter physics
- Metamaterials science
- Photonics
Background:
- Tellegen medium, proposed in 1948, features real-valued electric-magnetic cross-coupling, distinct from chiral media.
- Its existence has been debated for decades, with theoretical links to axion dynamics.
Purpose of the Study:
- To experimentally realize Tellegen metamaterials in the microwave spectrum.
- To demonstrate the characteristic Tellegen response and its potential applications.
Main Methods:
- Fabrication of metamaterials using subwavelength metallic resonators, gyromagnetic materials, and permanent magnets.
- Microwave measurements to observe electromagnetic responses.
Main Results:
- Successful realization of Tellegen metamaterials in the microwave region.
- Observation of a distinct Kerr rotation in reflection, with preserved polarization in transmission.
- Retrieved effective Tellegen parameter significantly higher than in natural materials.
Conclusions:
- Experimental validation of Tellegen metamaterials opens avenues for novel nonreciprocal photonic devices.
- Provides a practical platform for investigating axion physics phenomena.
