Magneto-Electric Double Fano Resonances in Hybrid Split Ring/Disk Hetero-Cavity
In this work, we conceive and demonstrate the magneto-electric double Fano resonances of a hetero-cavity composed of Si disk and Au split ring, where Si disk can provide additional magnetic responses besides electric responses. The interference between electric and magnetic responses in proposed hetero-cavity gives rise to magneto-electric double Fano resonances with magnetic and electric near-field enhancements. Dipole radiative enhancement is used to analyze magnetic and electric responses of hetero-cavity and the spectral features of hetero-cavity can be used to quantitatively characterize by coupled oscillator model. And the spectral tunability of magneto-electric double Fano resonances is investigated, highlighting a potential for applications in low-loss sensing and nanophotonic devices.
KeywordsSurface plasmon resonance Symmetry breaking Nanoparticles
This work was supported by the key project of the Natural Science Foundation of Tianjin City under Grant No 10JCZDJC23600.
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