Figure 4
Optical properties of 900-nm-period silver capped nanoslits under normal and oblique-angle incidence. (a) Schematic configuration depicting the geometrical parameters of capped silver nanoslits and the direction of the TM-polarized incident light. (b) Measured angular transmission diagram of 900-nm-period capped silver nanoslit arrays in air. The green and blue dashed lines show the calculated resonance wavelengths for the SPR and substrate modes, respectively. The measured spectrum of 900-nm-period capped silver nanoslits in air for incident angles of (c) 0° and (d) 16°. The inset in panel (c) shows the bandwidth of the 1st order mode was 3.2 nm.
