Giant dual-band asymmetric transmission based on all-dielectric metamaterial in the near-infrared band

We propose an all-dielectric metamaterial composed of bi-layered silicon structures orthogonally arranged on the sandwiched silica substrate, which exhibits giant dual-band asymmetric transmission of linearly polarized wave in the near-infrared regime, with one band working for the x-polarization and the other one for y-polarization. The dual-band AT phenomenon is explained by the distributions of electric field. In addition, the affection of the geometric parameters and incident angles to the AT parameters has been analyzed. Such an AT metamaterial has potential applications in polarization converters, switches and integrated photonic circuits.