Figure 4
From: Ultracompact Graphene-Assisted Tunable Waveguide Couplers with High Directivity and Mode Selectivity
Double group TE antenna coupler. (a) Schematic of the device for right-propagating TE mode couplings. (b) Vector diagram for the electric field at the right port. (c) and (d) Electric field norm distribution for the right and left port at 1.55 μm respectively. (e) and (f) Directivity as function of antenna group distance dy and μc respectively. Insets: Variations for operation wavelength λd. (g) Normalized transmission rate for the waveguide ports under different polarization states.
