Magnetoelectric couping in triangular metal-dielectric-metal metasurface

Abstract

Abstract: Metasurface structures based on subwavelength nanoscale units (meta-atoms) have been innovated and greatly enriched the technique of light field regulation. Therefore, it is of great value to study and design metasurface structures with unique properties and functions in light field regulation. The analysis of induced electric, magnetic, electro-magnetic and magneto-electric response within the symmetrical and asymmetrical metal - dielectric- metal (MDM) triangular prism meta-atoms are enumerated by the polarizability tensors of the meta-atoms. The polarization-independent metal-dielectric-metal (MDM) triangular prism periodic structure is designed. The transmission and reflectance spectrum of the MDM meta-surfaces are studied by finite difference time domain (FDTD) simulation and theoretical calculation method. The two results are well consistent with each other. It is found that the reflection spectrum of the symmetric metasurface is identical whether light incident from upward or downward. However, the reflection spectrum of the asymmetric metasurface depends on the direction of the incident light when the incident light frequency is around the resonant mode. The results reported here are helpful for the realization of asymmetrical metasurface with arbitrary reflectivity.

Key words: micro-nano optics, reflectance difference, polarizability tensors, metasurface, resonance

NI Saijian, WANG Han, WANG Yong, LU Yonghua*, WANG Pei. Magnetoelectric couping in triangular metal-dielectric-metal metasurface[J]. Chinese Journal of Quantum Electronics.

References

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