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We show that a properly designed bianisotropic metasurface placed at theinterface between two arbitrary different media, or coating a dielectric mediumexposed to the air, provides Brewster (reflectionless) transmission atarbitrary angles and for both the TM and TE polarizations. We present arigorous derivation of the corresponding surface susceptibility tensors basedon the Generalized Sheet Transition Conditions (GSTCs), and demonstrate thesystem with planar microwave metasurfaces designed for polarization-independentand azimuth-independent operations. Moreover, we reveal that such a systemleads to the concept of effective refractive media with engineerable impedance.The proposed bianisotropic metasurfaces provide deeply subwavelength matchingsolutions for initially mismatched media, and alternatively lead to thepossibility of on-demand manipulation of the conventional Fresnel coefficients.The reported generalized Brewster effect represents a fundamental advance inoptical technology, where it may both improve the performance of conventionalcomponents and enable the development of novel devices.

Generalized Brewster Effect using Bianisotropic Metasurfaces