Dispersionless Optical Activity in 3-D Chiral Metamaterial Composed of High-K Dielectric Cube and Metallic Mesh

In this paper, we propose a 3-D chiral metamaterial comprising of a high-K dielectric cube and metallic mesh in the microwave region. Our numerical results show that the metamaterial has dispersionless optical activity and an impedance matching to free space, resulting in broad polarization rotation and low reflectance.