Figure 1. Asymmetric Mach-Zehnder interferometer.
(a) Schematic layout. The lower plasmonic branch is widened in order to introduce a default asymmetry, (b) fundamental quasi-TM mode of the 500×600 nm2 PMMA-loaded SPP waveguide, (c) fundamental quasi-TM mode of the 700×600 nm2 PMMA-loaded SPP waveguide.