Figure 5
From: Highly-efficient three-dimensional waveguide couplers using impedance-tunable transformation optics
Schematic diagram of a three-dimensional dielectric waveguide coupler using impedance-tunable transformation optics. (a) The structure, where the relative permittivity and permeability of the core areas 1 and 2 are ε1, μ1 and ε2, μ2 respectively. The length of the coupler is l, and embedded within a transformation medium. (b) The used coordinate transformation.
