A study was conducted to demonstrate clusters of closely spaced gold nanoparticles as a source of two-photon photoluminescence at visible wavelengths. These homogeneous clusters of gold nanoparticles were fabricated, using electron-beam lithography (EBM) and vacuum deposition techniques. It was found that photoluminescence from gold is due to radiative recombination, following interband electronic transitions between the electronic bands. Gold nanoparticles and rough surfaces exhibited photoluminescence quantum yields significantly, due to local enhancement of the localized surface plasmon (LSP) near-field. Large blocks of gold nanoparticles were also fabricated, to demonstrate their utilization for the creation of an optically active material.
Vol. 20, no. 1 (Jan 2008), pp. 26-30