For the reflectance R and transmittance T calculations of the bulk material, a dielectric (I-spacer in MIM) was placed over the thick gold film in the case of reflection to match the experiment. In the case of transmission, the light source and a monitor have been placed 400 nm apart inside a 10 µm material to calculate the absorption attenuation associated with the progression of light for the distance of 400 nm. In this way, we can evaluate the intrinsic optical properties of material by suppressing extraneous light interference from interfaces. For the calculation of the metasurface, the smallest unit cell of the hexagonal lattice was used. The structure was designed in the xy-plane, with the direction of light propagation being set along the z-axis. Periodic boundary conditions were used in x-and y-directions and a perfectly matching layer (PML; i.e., an absorption boundary) was set for the z-axis. the electric (E-)field intensity enhancement taking place just below the metal disk (Fig. ).