Electromagnetic Helicity in Twisted Cavity Resonators
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915737219629056 |
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| author | Paterson, E. C. I. Bourhill, J. Tobar, M. E. Goryachev, M. |
| author_facet | Paterson, E. C. I. Bourhill, J. Tobar, M. E. Goryachev, M. |
| contents | 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 $κ_\text{eff}$ or axion field $θ_{\text{eff}}$ to the medium. Our findings demonstrate the potential for real-time, macroscopic manipulation of electromagnetic helicity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_03795 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electromagnetic Helicity in Twisted Cavity Resonators Paterson, E. C. I. Bourhill, J. Tobar, M. E. Goryachev, M. Classical Physics 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 $κ_\text{eff}$ or axion field $θ_{\text{eff}}$ to the medium. Our findings demonstrate the potential for real-time, macroscopic manipulation of electromagnetic helicity. |
| title | Electromagnetic Helicity in Twisted Cavity Resonators |
| topic | Classical Physics |
| url | https://arxiv.org/abs/2504.03795 |