High-Efficiency Second Harmonic Generation from a Single Hybrid ZnO Nanowire/Au Plasmonic Nano-Oligomer

GUSTAVO GRINBLAT; RAHMANI, MOHSEN; EMILIANO CORTÉS; M. CALDAROLA; D. COMEDI; STEFAN A. MAIER; A. V. BRAGAS

NANO LETTERS (PRINT)

AMER CHEMICAL SOC

Lugar: Washington; Año: 2014 vol. 14 p. 6660 - 6665

1530-6984

We introduce a plasmonic-semiconductor hybrid nanosystem, consisting of a ZnO nanowire coupled to a gold pentamer oligomer by crossing the hot-spot. It is demonstrated that the hybrid system exhibits a second harmonic (SH) conversion efficiency of ∼3 × 10−5%, which is among the highest values for a nanoscale object at optical frequencies reported so far. The SH intensity was found to be ∼1700 times larger than that from the same nanowire excited outside the hot-spot. Placing high nonlinear susceptibility materials precisely in plasmonic confined-field regions to enhance SH generation opens new perspectives for highly efficient light frequency up-conversion on the nanoscale.