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arXiv · 2504.03795

Electromagnetic Helicity in Twisted Cavity Resonators

E. C. I. Paterson·J. Bourhill·M. E. Tobar·M. Goryachev
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Abstract

Through left- or right-handed twisting, we investigate the impact of mirror-asymmetry (chirality) of the conducting boundary conditions of an equilaterial triangular cross-section electromagnetic resonator. We observe the generation of eigenmodes with non-zero electromagnetic helicity as a result of the coupling of near degenerate TE$_{11(p+1)}$ and TM$_{11p}$ modes. This can be interpreted as an emergence of magneto-electric coupling, which in turn produces a measurable shift in resonant mode frequency as a function of twist angle. We show that this coupling mechanism is equivalent to introducing a non-zero chirality material parameter $\kappa_\text{eff}$ or axion field $\theta_{\text{eff}}$ to the medium. Our findings demonstrate the potential for real-time, macroscopic manipulation of electromagnetic helicity.

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E. C. I. Paterson, J. Bourhill, M. E. Tobar, M. Goryachev. 2025-04-04. Electromagnetic Helicity in Twisted Cavity Resonators. https://doi.org/10.1103/6gp4-76td

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