Nonreciprocal Huygens' Metasurfaces Based on Bound States in the Continuum

Magneto-optical effects are typically very weak in the optical spectrum, and there- fore, nonreciprocal devices based on them are very bulky. We demonstrate that optical metasurfaces supporting quasi-bound states in the continuum provide a powerful way for achieving strong nonreciprocal responses in...

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Bibliographic Details
Main Authors: Manez-Espina, L. M., Faniayeu, I., Asadchy, V., Diaz-Rubio, A.
Format: Conference Proceeding
Language:English
Subjects:
Geometry
Isolators
Metasurfaces
Optical coupling
Optical materials
Optical metamaterials
Optical polarization
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Summary:Magneto-optical effects are typically very weak in the optical spectrum, and there- fore, nonreciprocal devices based on them are very bulky. We demonstrate that optical metasurfaces supporting quasi-bound states in the continuum provide a powerful way for achieving strong nonreciprocal responses in a sub-wavelength geometry. Using the multi-mode temporal coupled-mode theory, we synthesize and analyze a nonreciprocal metasurface with Huygens' meta-atoms based on conventional ferrite materials exhibiting nearly-unity contrast in transmission for circularly polarized light.
ISSN:2573-2706
DOI:10.1109/Metamaterials58257.2023.10289179