Figure 2: SPP propagation lengths on giant colloidal silver single crystals.
From: Giant colloidal silver crystals for low-loss linear and nonlinear plasmonics
(a) Schematic of the WLI setup for measuring the SPP propagation lengths on the Ag crystal. The incident angle of the halogen white light is about 75–80°. (b) Top-view and tilted-view SEM images of the FIB-milled nanogrooves. (c) The SPP scattering signal collected by an optical microscope. The inset shows the scattering image from the double-groove structure. (d) Schematic and experimental results of the DSI method for measuring the SPP propagation lengths. (e) SPP propagation lengths measured with both WLI: black squares and DSI: blue squares methods, in comparison with those reported for different Ag samples in the visible range (red circles: ref. 15, blue open triangles: ref. 12, black stars: ref. 16, black circles: ref. 20, pink inverted triangles: ref. 21). The error bars shown for method 1 represent s.d. of measurement values from several double-slit structures (see Supplementary Fig. 3). The error bars shown for method 2 are s.d. in d. The predicted propagation length using the JC Ag data were calculated by the eigenmode method for an air/5 nm-Al2O3/Ag planar structure, and the error bars are from the JC data (ref. 21).
