What is it about?

High Q-factor resonance holds great promise for bio-chemical sensing and enhanced light-matter interaction. We have shown that terahertz magnetic resonances can be achieved by exploiting the coherent Fano interactions with high Q-factor beyond 10,000. We have demonstrated experiments to confirm terahertz magnetic resonance accompanied by a high-Q of no less than 261. This was previously thought impossible as terahertz magnetic resonances usually result in huge energy radiation loss, which limits the Q-factor to less than 15.

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Why is it important?

This finding shows two significant things: on one side, a new physical mechanism of exploiting magnetic dipole at the Wood-Rayleigh anomaly frequency to suppress radiation loss of electromagnetic energy; on the other side, the experiment demonstrates the superiority performance of terahertz magnetic resonance for the first time, and achieves breakthrough results.


Writing this article was a great pleasure as it has co-authors with whom I have had long standing collaborations. This article would trigger much interest to the THz community on the new approach. Our finding are quite promising in wide applications for the enhancement of terahertz field-matter interaction, terahertz sensing and detecting.

Li Li
Harbin Institute of Technology

Read the Original

This page is a summary of: Terahertz high-Q magnetic dipole resonance induced by coherent Fano interactions, Applied Physics Letters, November 2022, American Institute of Physics, DOI: 10.1063/5.0112993.
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