Emergence of transverse optical spin in a subwavelength grating ring resonator
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866914319066726400 |
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| author | Iukhtanov, Nikita Sun, Chao Kurganov, Georgiy Zhirihin, Dmitry Bogdanov, Andrey Savelev, Roman |
| author_facet | Iukhtanov, Nikita Sun, Chao Kurganov, Georgiy Zhirihin, Dmitry Bogdanov, Andrey Savelev, Roman |
| contents | The local polarization of the electromagnetic field plays a crucial role in the interaction of light with spin- and valley-polarized quantum sources. Unlike free-space electromagnetic waves, whose polarization degeneracy enables flexible polarization manipulation, planar integrated optical structures lack such degree of freedom owing to intrinsic structural anisotropy. Here, we propose a planar optical ring resonator based on a subwavelength grating waveguide that supports two quasi-degenerate modes. We demonstrate that coupling of these modes in the ring resonator leads to the formation of the resonances with a predominant direction of electric-field rotation in the vicinity of the resonator, resulting in the non-zero transverse optical spin. The average degree of circular polarization in the proposed structures reaches values of up to 70%. The theoretical predictions are corroborated by experimental validation in the microwave spectral range. Our findings suggest a viable route toward realization of on-chip optical spintronic and valleytronic interfaces. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_09614 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Emergence of transverse optical spin in a subwavelength grating ring resonator Iukhtanov, Nikita Sun, Chao Kurganov, Georgiy Zhirihin, Dmitry Bogdanov, Andrey Savelev, Roman Optics The local polarization of the electromagnetic field plays a crucial role in the interaction of light with spin- and valley-polarized quantum sources. Unlike free-space electromagnetic waves, whose polarization degeneracy enables flexible polarization manipulation, planar integrated optical structures lack such degree of freedom owing to intrinsic structural anisotropy. Here, we propose a planar optical ring resonator based on a subwavelength grating waveguide that supports two quasi-degenerate modes. We demonstrate that coupling of these modes in the ring resonator leads to the formation of the resonances with a predominant direction of electric-field rotation in the vicinity of the resonator, resulting in the non-zero transverse optical spin. The average degree of circular polarization in the proposed structures reaches values of up to 70%. The theoretical predictions are corroborated by experimental validation in the microwave spectral range. Our findings suggest a viable route toward realization of on-chip optical spintronic and valleytronic interfaces. |
| title | Emergence of transverse optical spin in a subwavelength grating ring resonator |
| topic | Optics |
| url | https://arxiv.org/abs/2602.09614 |