title: Cascaded four-wave mixing in tapered plasmonic nanoantenna.
abstract: We theoretically study the cascaded four-wave mixing (FWM) in broadband tapered plasmonic nanoantennas. In comparison with nonlinear bulk medium they demonstrate a 300-fold increase in nonlinear frequency conversion detected in the main lobe of the nanoantenna far-field pattern. This is achieved by tuning the elements of the nanoantenna to resonance frequencies involved in the FWM interaction. Our findings have a potentially broad application in ultrafast nonlinear spectroscopy, sensing, on-chip optical frequency conversion, nonlinear optical metamaterials, and photon sources.
authors.affiliation: Nonlinear Physics Centre, Australian National University, Research School of Physics and Engineering, Canberra ACT 0200, Australia. mis124@physics.anu.edu.au
authors.forename: I S
authors.initials: IS
authors.lastname: Maksymov
authors.forename: A E
authors.initials: AE
authors.lastname: Miroshnichenko
authors.forename: Yu S
authors.initials: YS
authors.lastname: Kivshar