Perfect magnetic mirror based on magnetic dipole scattering in all-dielectric resonators

Perfect magnetic mirrors are important optical devices for the development of novel optical detectors, solar cells, and imaging devices. They have the property of only reversing the magnetic field of a light wave upon reflection, for instance, in functional optical metasurfaces. To design an optical...

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Bibliographic Details
Published in:Journal of applied physics 2022-04, Vol.131 (15)
Main Authors: Yu, Yang, Li, Yong-Qian, Salas-Montiel, Rafael, Qiao, Da-Yong
Format: Article
Language:English
Subjects:
Applied physics
Charged particles
Dielectric strength
Electric dipoles
Electric fields
Engineering Sciences
Incident waves
Light reflection
Magnetic dipoles
Magnetic mirrors
Magnetic properties
Optical properties
Optics
Photonic
Photovoltaic cells
Physics
Radiation
Resonance scattering
Resonators
Solar cells
Wave reflection
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Summary:Perfect magnetic mirrors are important optical devices for the development of novel optical detectors, solar cells, and imaging devices. They have the property of only reversing the magnetic field of a light wave upon reflection, for instance, in functional optical metasurfaces. To design an optical magnetic mirror, high-refractive-index dielectric nanostructures that support strong magnetic dipole (MD) response in the optical wavelength range are used. However, the spectral overlap between the MD and electric dipole in dielectric resonators degrades the magnetic mirror reflection. Here, we propose and demonstrate a perfect optical magnetic mirror metasurface that totally reflects an incident wave without electric field phase change. In this perfect magnetic mirror, the electric dipole radiation is completely suppressed by the radiation of the anapole mode in the spectral range where the destructive interference between the electric dipole and toroidal dipole occurs. By fine-tuning the size parameters of the dielectric resonators, we show near-perfect MD scattering as a result of the spectral overlap between MD resonance and anapole mode. The optical magnetic mirror can be tuned from the visible to near-infrared range by scaling the sizes of the resonators. The MD scattering resonators promote the perfect magnetic mirror, a promising platform for designing photodetectors, biological sensors, and reflected waveplates.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0085397