The law of refraction first derived by Snellius and later introduced as the Huygens-Fermat principle, states that the incidence and refracted angles of a light wave at the interface of two different materials are related to the ratio of the refractive indices in each medium. Whereas all natural materials have a positive refractive index and therefore exhibit refraction in the positive direction...

Abstract Despite ample experimental evidence that the so‐called epsilon‐near‐zero (ENZ) materials enable enhancement of nonlinear interactions in limited volumes materials, there is still a lot controversy about theoretical interpretation results search optimal and structural configurations. The performance depending on their refractive index compared direct simulations prove with indium‐tin ox...