A facile single step strategy for the synthesis and large area patterning of silver nanoparticles via photodecomposition of a photoactive silver nitrite aliphatic amine complex was developed. Decomposition of the silver complex was facilitated using either a UV or an Argon ion laser (514.5 nm) irradiation. The synthesis was performed both in solution and thin films. The silver nanoparticles displayed characteristic localized surface plasmon resonance in the absorption spectrum. Utilizing laser beam interference, silver nanoparticles were synthesized and, as well, patterned in a single step.