  Biofilm templated gold nanonetwork provide a platform to study the transition
of local plasmon to a surface plasmon. The switch from localized surface
plasmon resonance (LSPR) to surface plasmon resonance (SPR) is induced by the
percolation of metal atoms between gold nano-islands. Formed nano-composites
showed a transition in metal percolation state (non-percolating to percolating
state), as evident from electrical properties. The optical component of the
study followed a previously tested method by our group, in which photonic
coherences are induced by biofilms. Peaks were obtained in enhancement spectra
that were found to correspond with plasmonic peaks, which in turn depended on
Au precursor concentration that had been added.

Mesoscale and Nanoscale Physics;Soft Condensed Matter;Biological Physics