Fig. 3

Reflectivity spectra for samples 1–3 (Table 1), calculated by FDTD, plotted versus the energy of the incident light. The spectra are arbitrarily shifted for clarity and the incidence angles are indicated. The spectra from figures (a) to (c) correspond to those of samples 1 to 3; respectively. The dashed vertical lines correspond 632.8 nm (1.95 eV) (red) and TDBC absorption maximum 590 nm (2.1 eV) (black).