We have theoretically studied the strong coupling of the surface plasmon polaritons (SPP) and magnetic polaritons (MP) modes in an Au grating/dielectric/Au resonance structure in the near-infrared waveband. Our results show that SPP and MP modes can strongly interact with each other at the metal grating/dielectric/metal (MDM) interface, leading to a large Rabi splitting. We also find that the light absorptivity in the high- and low-frequency branches within the anticrossing region are abnormally different. Moreover, the simulation results indicate that strong SPP-MP coupling can be tuned by modulating the geometric parameters of the structure. The unique characteristics of strong coupling of SPP and MP modes in this simple MDM hybrid structure will be helpful in the design of various polaritonic devices.
In this work, high resonant reflection of light has been investigated in an atomic thickness resonator consisting of monolayer graphene nanosquare arrays at mid-infrared frequencies. Our numerical results show that more than 90% light reflectivity can be realized due to excitation of dipole resonance in the gap of graphene arrays in this system. Moreover, it is found the high resonant reflection is nearly independent of polarization over a wide-angle range. The resonant wavelength can be dynamically modulated by changing the geometry of the structure or adjusting the graphene chemical potential. Our findings provide new opportunities for the development of optical reflective devices, nano-antenna and highly integrated devices with atomic thickness.
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