Keywords:Mie resonance, Metasurface, Nanophotonics
Metasurface is one kind of material with engineered optical properties which is not naturally found. Metasurfaces made of metals, such as gold and silver, are well investigated in recent years. However, it is limited by high ohmic loss with increasing frequency. Hence, metasurfaces composed of lossless dielectric materials emerge as a competitor recently. Metasurfaces based on dielectric materials with high refractive index support resonances that are referred to as Mie resonances. The schematic diagram of low-order Mie resonances consists of Electric Dipole (ED) mode and Magnetic Dipole (MD) mode resonances are shown in Fig. 1(a) and Fig. 1(b) respectively. Mie resonators have varieties of applications such as high-resolution color printing , color filter , and light emission . However, the aspect ratio of conventional Mie resonators is higher than 0.6 which means their structures are close to cylinders or rods rather than disks.
In this paper, we investigate a dielectric disk as a thin Mie resonator with a reduced aspect ratio to get access to the enhanced field inside the resonator.