Figure 6
From: Tunable pattern-free graphene nanoplasmonic waveguides on trenched silicon substrate
Coupling between two parallel GPWGs and an ADC optical switch.
(a) Coupling length of two identical parallel waveguides as a function of the separation D when w = 50 nm, d1 = 60 nm and d2 = 40 nm. Inset: The schematic of the coupling configuration. (b) Coupling length of two identical parallel waveguides as the waveguide width w varies when D = 150 nm, d1 = 60 nm and d2 = 40 nm. (c) Schematic of the ADC optical switch with w1 = 40 nm, w2 = 150 nm, d1 = 90 nm, d2 = 30 nm, D = 17.4 nm, L1 = 1.25 μm, L2 = 0.615 μm, L3 = 0.638 μm. (d) Ez component of the ADC optical switch in the graphene plane for on-state and off-state.
