International Journal of Optics / 2012 / Article / Fig 2

Review Article

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 = 1 0 0  nm, 𝐿 = 2 2 0  nm, 𝑀 0 = 𝑀 = 5 0  nm. Also shown is the dispersion relation for lossless metal (red dash-dotted line) and the resonance frequency πœ” r e s (black dashed line) ( πœ” r e s β‰… 0 . 0 6 7 βˆ— 2 πœ‹ 𝑐 / 𝑑 corresponding to πœ† r e s β‰… 1 . 5 πœ‡ π‘š ). (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 πœ† 0 = 1 . 5 5  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 πœ† 0 = 1 . 5 5  μm calculated using FDFD. Results are shown for 𝑑 = 1 0 0  nm (upper blue curve) and 𝑑 = 2 0 0  nm (lower red curve) as 𝐿 is varied. All other parameters are as in (b).

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