Here, we demonstrate that transformation optics can be used to produce 2-D

non-magnetic waveguide couplers with no reflections. Our approach consists of using a scaling

function for reflection suppression and introducing an auxiliary...

Using the transformation optics method together with the basic properties of Maxwell equations, a compact nonmagnetic waveguide coupler is designed that can ideally couple all TMn modes. Two compression functions are proposed to provide a perfect...