Fig. 1: Dielectric MM exhibiting effective self-dual property and full-polarization omnidirectional Brewster effect.

a The classical Brewster effect limited to a particular incident angle, i.e., Brewster angle \({\theta }_{{\rm{b}}}\) and the TM polarization, and the birefringence effect of beam splitting due to anisotropy. b Illustration of an anisotropic dielectric MM exhibiting full-polarization omnidirectional Brewster effect, as well as birefringence-free anisotropy as the consequence of effective duality symmetry realized in this dielectric MM