Omnidirectional impedance matching induced by spatial dispersions

We theoretically and experimentally demonstrate that by utilizing a new freedom introduced by spatial dispersions in the effective parameters, Brewster effect can be extended from a single angle to a range of angles, enabling wide-angle impedance matching and total transmission of light through the surface. By designing pure dielectric photonic crystals with spatial dispersions, we demonstrate an approach to achieve the omnidirectional total transparency and aberration-less virtual image. Our work reveals rich possibilities like wide-angle loss-less super-polarizer and transformation optics devices with additional phases beyond the local medium description.