Coupling to nanoscale negative-refraction planar waveguides

Negative index non-magnetic strongly anisotropic waveguides have been shown to provide efficient beam steering and manipulation in nanoscale areas with applications that include sub-diffraction planar lens imaging and photonic funnels. In this work we study the coupling to and from sub-wavelength planar waveguides of different sizes and compare the transmission through a negative-index structure to the Bethe prediction for positive index materials. We simulate EM wave propagation and imaging in arbitrary waveguide configurations with a focus on designing and optimizing planar-waveguide based beam-steering photonic devices.