1 Tuning gold nanorod-nanoparticle hybrids into plasmonic Fano resonance for enhanced lightening and transmission

Abstract

We investigate the optical response of a gold nanorod (NR) array coupled with a gold nanoparticle (NP) film. We show that, as the NP density is increased to the percolating regime, the NR-NP hybrids are tuned into plasmonic Fano resonance, characterized by the coherent coupling of the discrete plasmonic modes of the NR array with the continuous plasmonic modes of the NP film. As a consequence, the optical transmission of the NP film is substantially enhanced. Even more strikingly, the electromagnetic fields around the NR array become much stronger, as reflected by the two orders of magnitude enhancement in the avalanche photoluminescence. These findings may prove instrumental in the design of various plasmonic nanodevices.