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Abstract
Nonreciprocal devices, including optical isolators, phase shifters, and amplifiers, are pivotal for advanced optical systems. However, exploiting natural materials is challenging due to their weak magneto-optical (MO) effects, requiring substantial thickness to construct effective optical devices. In this study, it is demonstrated that subwavelength metasurfaces supporting bound states in the continuum (BICs) and made of conventional ferrimagnetic material can exhibit strong nonreciprocity in the Faraday configuration and near-unity magnetic circular dichroism (MCD). These metasurfaces enhance the MO effect by 3–4 orders of magnitude compared to a continuous film of the same material. This significant enhancement is achieved by leveraging Huygens' condition in the metasurface whose structural units support paired electric and magnetic dipole resonances. The multi-mode temporal coupled mode theory (CMT) is developed for the observed enhancement of the MO effect, and the findings with the full-wave simulations are confirmed.
Original language | English |
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Article number | 2301455 |
Journal | ADVANCED OPTICAL MATERIALS |
Volume | 12 |
Issue number | 1 |
Early online date | 2023 |
DOIs | |
Publication status | Published - 4 Jan 2024 |
MoE publication type | A1 Journal article-refereed |
Keywords
- bound states in the continuum
- Faraday rotation
- magneto-optical effect
- metasurfaces
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Dive into the research topics of 'Extreme Nonreciprocity in Metasurfaces Based on Bound States in the Continuum'. Together they form a unique fingerprint.Projects
- 1 Active
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DeCAP: Designer Composites with Axionic Properties
Asadchy, V. (Principal investigator), Safaei Jazi, S. (Project Member) & Amrahi Iniolya, B. (Project Member)
01/09/2023 → 31/08/2027
Project: Academy of Finland: Other research funding
Equipment
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Aalto Electronics-ICT
Ryynänen, J. (Manager)
Department of Electronics and NanoengineeringFacility/equipment: Facility