Abstract
We numerically investigate the coupling effects of surface plasmon polaritons (SPPs) and magnetic dipole (MD) resonances in metamaterials, which are composed of an Ag nanodisk array and a SiO2 spacer on an Ag substrate. The periodicity of the Ag nanodisk array leads to the excitation of SPPs at the surface of the Ag substrate. The near-field plasmon interactions between individual Ag nanodisks and the Ag substrate form MD resonances. When the excitation wavelengths of SPPs are tuned to approach the position of MD resonances by changing the array period of Ag nanodisks, SPPs and MD resonances are coupled together into two hybridized modes, whose positions can be well predicted by a coupling model of two oscillators. In the strong coupling regime of SPPs and MD resonances, the hybridized modes exhibit an obvious anti-crossing, resulting into an interesting phenomenon of Rabi splitting. Moreover, the magnetic fields under the Ag nanodisks are greatly enhanced, which may find some potential applications, such as magnetic nonlinearity.
Highlights
It is well known that naturally occurring materials exhibit the saturation of the magnetic response beyond the THz regime
We will numerically demonstrate the huge enhancement of magnetic fields at optical frequencies and the interesting phenomenon of Rabi splitting, due to the coupling effects of SPPs and magnetic dipole (MD) resonances in metamaterials composed of an Ag nanodisk array and a SiO2 spacer on an Ag substrate
The periodicity of the Ag nanodisk array leads to the excitation of SPPs at the surface of the Ag substrate
Summary
It is well known that naturally occurring materials exhibit the saturation of the magnetic response beyond the THz regime. It is well known that plasmonic electric dipole resonance can hugely enhance electric fields in the vicinity of metal nanoparticles, and its coupling to SPPs can further enhance electric fields and generate other interesting physical phenomena. We will numerically demonstrate the huge enhancement of magnetic fields at optical frequencies and the interesting phenomenon of Rabi splitting, due to the coupling effects of SPPs and MD resonances in metamaterials composed of an Ag nanodisk array and a SiO2 spacer on an Ag substrate. In the strong coupling regime of SPPs and MD resonances, the hybridized modes exhibit an obvious anticrossing, resulting into an interesting phenomenon of Rabi splitting. This work mainly focuses on numerical investigation, but the designed metamaterials should be realized experimentally by the following procedures: the SiO2 spacer is first coated on the Ag substrate through thermal evaporation, and the Ag nanodisk array is fabricated on the SiO2 spacer by some advanced nanofabrication technologies, such as electron beam lithography (EBL)
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