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Examples of TM modes of a nonlinear slot coupler for (left column) and (right column). The plots show the magnetic component for antisymmetric modes [(a) and (d)], symmetric modes [(b) and (e)], and asymmetric modes [(c) and (f)]. The labels correspond to the points marked in Fig. 2.
Total mode power vs propagation constant for the modes of the nonlinear plasmonic coupler. The points [(a)–(f)] correspond to the modes shown in Fig. 1. Point O is the bifurcation point for the asymmetric mode.
Examples of mode propagation and beating in the plasmonic coupler for different input powers: (a) Linear regime, , (b) intermediate regime, , and (c) nonlinear regime, . The image shows the modulus of the magnetic component.
Normalized output power vs input power for the excited waveguide of the nonlinear plasmonic slot coupler at the beat length , shown for vanishing and realistic losses.
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