Assessing the plasmonics of gold nano-triangles with higher order laser modes

• Laura E. Hennemann,
• Andreas Kolloch,
• Andreas Kern,
• Josip Mihaljevic,
• Johannes Boneberg,
• Paul Leiderer,
• Alfred J. Meixner and
• Dai Zhang

Beilstein J. Nanotechnol. 2012, 3, 674–683, doi:10.3762/bjnano.3.77

• thirdly with the employed substrate. Moreover, we obtained strongly enhanced Raman spectra of an adenine (sub-)monolayer on gold Fischer patterns on glass. We thus showed that gold Fischer patterns are promising surface-enhanced Raman scattering (SERS) substrates. Keywords: Fischer pattern; higher order

• hexagonal array of gold triangles on the substrate, which, as already mentioned above, is often referred to as a Fischer pattern [7]. Polystyrene spheres of diameters D between 200 and 1500 nm were used. The film height h of the evaporated gold was varied between 40 and 200 nm (see Figure 2b for the

• ) were the only ones to show a clear pattern. Due to their hexagonal layout and inter-distance, we believe that each of the bright spots marked the centre of a former bead position. The thicker triangles with h = 200 nm yielded clearer contrasts. The Fischer pattern with L ≈ 350 nm showed bright spots of