title: Augmenting second harmonic generation using Fano resonances in plasmonic systems.
abstract: Significant augmentation of second harmonic generation using Fano resonances in plasmonic heptamers made of silver is theoretically and experimentally demonstrated. The geometry is engineered to simultaneously produce a Fano resonance at the fundamental wavelength, resulting in a strong localization of the fundamental field close to the system, and a higher order scattering peak at the second harmonic wavelength. These results illustrate the versatility of Fano resonant structures to engineer specific optical responses both in the linear and nonlinear regimes thus paving the way for future investigations on the role of dark modes in nonlinear and quantum optics.
authors.affiliation: Nanophotonics and Metrology Laboratory (NAM), Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland.
authors.forename: Krishnan
authors.initials: K
authors.lastname: Thyagarajan
authors.forename: Jérémy
authors.initials: J
authors.lastname: Butet
authors.forename: Olivier J F
authors.initials: OJ
authors.lastname: Martin
mesh_terms: D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry; D055095:Optics and Photonics; D010316:Particle Size; D011789:Quantum Theory; D012542:Scattering, Radiation; D012834:Silver / Q000737:chemistry*; D020349:Surface Plasmon Resonance
chemical_list: D012834:Silver