Single Plasmonic Nanoparticle Electroluminescence
Master of Science
Plasmonic tunnel junctions perform the role of classical antennas in the visible. Due to their ultra-small footprint and their unique potential for being modulated at terahertz frequencies, they have gained much interest recently. Metal insulatormetal (M-I-M) junctions always have been the main component of plasmonic tunnel junctions due to their enhanced local density of optical states and increased inelastic electron tunneling probability. However, the presence of two few-nanometer apart plasmonic metals obscures the plasmonic resonance of each individual part. Here, in contrast to M-I-M junction, we use graphene to electrically contact a plasmonic nanoparticle. Since graphene is a dielectric in the optical frequencies, plasmon resonance of the nanoparticle is affected the least possible. This scheme has the benefit of increasing the spectral tunability of the emitted light above what is reported in M-I-M junctions.
Plasmonics; Nanoantenna; Electroluminescence; Optical Antenna; Tunnel junction