Building Plasmonic Crystals from Plasmonic Metamolecules

We present a theoretical and experimental analysis of the plasmon surface latticeresonances arising from gold nanoparticle assemblies. The metamolecules of the array arecomposed of colloidal gold nanoparticles and as the system is heated up, creating a singlepolycrystalline metamolecule. They were characterized by several microscopy methods forretrieving the shape. Subsequently, the optical resonances from the annealed plasmonic crystalswere obtained by measuring the transmission at normal incidence and at several angles, and thencompared to FDTD simulations for adjudicating field components to each resonance. Finally,photoluminiscence experiments were carried out in order to analyze the photoluminiscenceenhancement and the potential applications for lasing.