Figure 5: (a) Schematic of a switch consisting of a silver-air-silver MDM plasmonic waveguide side-coupled to a cavity filled with an absorbing material with refractive index . The imaginary part of the refractive index can be modified with an external control beam. (b) Transmission spectra of the switch calculated using FDFD. Results are shown for nm, nm, (black curve), nm, nm, (red curve), nm, nm, (green curve), and nm, nm, (blue curve). In all cases nm and μm.