Full text loading...
(a) Schematic picture of the textured metallic groove. (b) Dispersion relation of the fundamental mode of CPPs for textured grooves with different values of b and t. The dispersion curves for the fundamental modes of CPPs in the uniform U-shaped and V-shaped grooves (with the same width and depth) are also shown for comparison. All the textured grooves have the same parameters: , h = 1.5 μm, and d = 0.3 μm.
Spatial variation of the E field amplitude of the fundamental mode of CPPs at μm. (a) Uniform V-shaped groove, (b) textured groove with b = 0.18 μm, (c) textured groove with b = 0.53 μm, (d) textured groove with b = 0.18 μm, but whose wall indentations are uniformly deep. Dotted line marks the boundary for the 1/e decrease of the E field amplitude. For all cases, the groove depth is h = 1.5 μm and the V groove angle .
Dispersion relations of the first three modes of CPPs, insets show the amplitude of modal electric fields for the two high-order modes at μm. The structure parameters are , h = 1.5 μm, b = 0.18 μm, and d = 2t = 0.3 μm.
bc and related Lp as a function of h (a) or θ (b). The groove angle is in (a) and the groove depth h = 1.5 μm in (b). The wavelength is μm.
Field concentration via gradually increase of b. (a) and (b) Spatial variation of the E field amplitude (logarithmic scale) on different cutting slices. (a) the vertical slice halving the structure, (b) the horizontal slice at the height (100 nm above the groove bottom) marked by dotted line in (a). (c) Distribution of the E field amplitude with propagation distance for different heights above the groove bottom. Circles represent the results in the presence of metal loss. (d) Distribution of the E field amplitude along the groove depth for different propagation distances. Insets show the transverse profiles of the fields at these distances.
Article metrics loading...