Figure 2
From: Gap-plasmon based broadband absorbers for enhanced hot-electron and photocurrent generation
(a) Experimentally measured absorption spectra of the Au-NPs/TiO2/Au-film nanostructure (red), the pure TiO2 film (blue) and the Au-NPs/TiO2 nanostructure (olive). The insets show the photographic images of the prepared samples. (b) Calculated normal incidence absorption spectra of the Au-NPs/TiO2/Au-film nanostructure and absorption contributions from the top layer of Au NPs (dark-yellow) and the bottom Au film (orange). For comparison, simulated absorption spectrum of a planar optically thick Au film is also present (purple dashed line). The inset shows the unit cell with a period of 100 nm and surface coverage of ~35%.
