Optical Materials Express· 2026Q2
Continuous modal spectrum in nonreciprocal cavities
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- Q2SCImago
- 2026year
Short summary
Nonreciprocal cavities, unlike conventional ones with discrete modes, exhibit a continuous modal spectrum, demonstrated in a ferrite-loaded microwave cavity.
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Key points
- Nonreciprocal cavities exhibit a continuous modal spectrum, contrasting with the discrete eigenmodes of conventional cavities.
- A ferrite-loaded microwave cavity with tailored unidirectional waveguides demonstrates this spectral transition.
- The transition to a continuous spectrum is associated with strong spatial localization of electromagnetic fields.
- Dissipation alone does not regularize the singular responses in these nonreciprocal systems.
AI-generated from the title and abstract; the full text is not read.
Abstract
Nonreciprocal systems enable asymmetric energy transport and suppress backscattering, giving rise to unconventional wave phenomena. Here, we show that nonreciprocal cavities based on unidirectional waveguides exhibit a continuous modal spectrum, in contrast to conventional cavities with discrete eigenmodes. Using a ferrite-loaded microwave cavity as an example, we demonstrate that enforcing unidirectionality, by tailoring the waveguide geometry, drives a transition from discrete to continuous spectra, accompanied by strong spatial localization of electromagnetic fields. Our results reveal that dissipation alone fails to regularize these singular responses, highlighting the need for additional mechanisms to control localization in nonreciprocal systems.
The authors' abstract, as published at the source. Optical Materials Express, 2026 · DOI ↗
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Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science