Nanoscale Plasmonic Devices Based on Metal-Dielectric-Metal Stub Resonators

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 𝑛=2.02+𝑖𝜅. The imaginary part 𝜅 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 𝑤=50 nm, 𝐿=120 nm, 𝜅=0 (black curve), 𝑤=50 nm, 𝐿=405 nm, 𝜅=0 (red curve), 𝑤=200 nm, 𝐿=175 nm, 𝜅=0 (green curve), and 𝑤=50 nm, 𝐿=120 nm, 𝜅=0.1 (blue curve). In all cases 𝑤₀=50 nm and 𝜆₀=1.55 μm.

(a)

(b)