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

Figure 2

(a) Schematic of a plasmonic waveguide system consisting of a metal-dielectric-metal (MDM) waveguide side-coupled to a periodic array of MDM stub resonators. (b) Dispersion relation of the plasmonic waveguide system of (a) calculated using FDFD (black solid line). Results are shown for a silver-air structure with 𝑑=100 nm, 𝐿=220 nm, 𝑤₀=𝑤=50 nm. Also shown is the dispersion relation for lossless metal (red dash-dotted line) and the resonance frequency 𝜔_res (black dashed line) (𝜔_res≅0.067∗2𝜋𝑐/𝑑 corresponding to 𝜆_res≅1.5𝜇𝑚). (c) Reciprocal of the group velocity 𝑣_𝑔 of light in the plasmonic waveguide system as a function of frequency. All parameters are as in (b). (d) Magnetic field profile of the supported optical mode in the system at 𝜆₀=1.55 μm. All other parameters are as in Figure 2(b). (e) Reciprocal of 𝑣_𝑔 versus propagation length 𝐿_𝑝 for the plasmonic waveguide system of Figure 2(a) at 𝜆₀=1.55 μm calculated using FDFD. Results are shown for 𝑑=100 nm (upper blue curve) and 𝑑=200 nm (lower red curve) as 𝐿 is varied. All other parameters are as in (b).

(a)

(b)

(c)

(d)

(e)