Fig. 2: Theoretical approach and numerically simulated results of transmission-type doping.
From: Transmission-type photonic doping for high-efficiency epsilon-near-zero supercoupling
a The geometry of transmission-type doping. A dopant with the length 2d and relative permittivity εd is placed in the middle of the ENZ channel with the length 2 l. b Simulated results of magnetic field distribution in (a) at the EMNZ frequency. The white arrows reveal the direction of the EM energy fluids. c Calculated transmission amplitude, d phase (after calibration), and (e) group delay for the transmission-type doping in (a). Numerically simulated results are demonstrated for comparison. f Magnetic field enhanced coefficient |Hmax|/|Hin| in both resonance-type and transmission-type doping. Results with different dielectric loss tangent tan δ are used for comparison. Trans., transmission-type doping. Res., resonance-type doping. g Calculated results of transmission amplitude for the dopants with different dielectric loss tangents in (a).
