Figure 1.

Gold microdisk arrays on a CaF₂ substrate and PMMA characterization. (a) Schematic illustration of a sample consisting of a microdisk array on a calcium fluoride substrate and covered by a layer of PMMA. (b) Atomic force microscope image of a 3 × 3 particle region of one of the arrays. The scale bar indicates the length of the unit cell, which is 4 μm. The circle-like shadows around the disks are organic residues of the fabrication process that do not influence the array’s SLR. (c) FTIR transmission spectrum of a PMMA thin film. The C=O molecular resonance is indicated. The molecular structure of PMMA is shown as an inset.