Magneto-optic perturbation theory for near-complete violation of Kirchhoff's law of thermal emission at low magnetic fields
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866908911737503744 |
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| author | Cui, Daniel Raman, Aaswath P. |
| author_facet | Cui, Daniel Raman, Aaswath P. |
| contents | Magneto-optic photonic systems can violate Kirchhoff's law of thermal emission by breaking Lorentz reciprocity. We develop a dispersive perturbation theory yielding an analytical expression for magneto-optical resonance frequency shifts in plasmonic semiconductors under applied magnetic fields. This expression shows the shift is governed by the overlap of the mode's optical spin density with the magneto-optical material. We use this expression to design a III-V metasurface that achieves nonreciprocal emissivity contrast of 0.8 at only 0.1 T, and demonstrate that the theory can explain order-of magnitude differences in magnetic field sensitivity between different photonic structures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_23538 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Magneto-optic perturbation theory for near-complete violation of Kirchhoff's law of thermal emission at low magnetic fields Cui, Daniel Raman, Aaswath P. Optics Magneto-optic photonic systems can violate Kirchhoff's law of thermal emission by breaking Lorentz reciprocity. We develop a dispersive perturbation theory yielding an analytical expression for magneto-optical resonance frequency shifts in plasmonic semiconductors under applied magnetic fields. This expression shows the shift is governed by the overlap of the mode's optical spin density with the magneto-optical material. We use this expression to design a III-V metasurface that achieves nonreciprocal emissivity contrast of 0.8 at only 0.1 T, and demonstrate that the theory can explain order-of magnitude differences in magnetic field sensitivity between different photonic structures. |
| title | Magneto-optic perturbation theory for near-complete violation of Kirchhoff's law of thermal emission at low magnetic fields |
| topic | Optics |
| url | https://arxiv.org/abs/2603.23538 |