title: Ion-beam assisted laser fabrication of sensing plasmonic nanostructures.
abstract: Simple high-performance, two-stage hybrid technique was developed for fabrication of different plasmonic nanostructures, including nanorods, nanorings, as well as more complex structures on glass substrates. In this technique, a thin noble-metal film on a dielectric substrate is irradiated by a single tightly focused nanosecond laser pulse and then the modified region is slowly polished by an accelerated argon ion (Ar(+)) beam. As a result, each nanosecond laser pulse locally modifies the initial metal film through initiation of fast melting and subsequent hydrodynamic processes, while the following Ar(+)-ion polishing removes the rest of the film, revealing the hidden topography features and fabricating separate plasmonic structures on the glass substrate. We demonstrate that the shape and lateral size of the resulting functional plasmonic nanostructures depend on the laser pulse energy and metal film thickness, while subsequent Ar(+)-ion polishing enables to vary height of the resulting nanostructures. Plasmonic properties of the fabricated nanostructures were characterized by dark-field micro-spectroscopy, Raman and photoluminescence measurements performed on single nanofeatures, as well as by supporting numerical calculations of the related electromagnetic near-fields and Purcell factors. The developed simple two-stage technique represents a new step towards direct large-scale laser-induced fabrication of highly ordered arrays of complex plasmonic nanostructures.
authors.affiliation: School of Natural Sciences, Far Eastern Federal University, 8 Sukhanova str., Vladivostok 690041, Russia.|Institute of Automation and Control Processes, Far Eastern Branch, Russian Academy of Science, 5 Radio str., Vladivostok 690041, Russia.
authors.forename: Aleksandr
authors.initials: A
authors.lastname: Kuchmizhak
authors.affiliation: School of Natural Sciences, Far Eastern Federal University, 8 Sukhanova str., Vladivostok 690041, Russia.|Institute of Automation and Control Processes, Far Eastern Branch, Russian Academy of Science, 5 Radio str., Vladivostok 690041, Russia.
authors.forename: Stanislav
authors.initials: S
authors.lastname: Gurbatov
authors.affiliation: School of Natural Sciences, Far Eastern Federal University, 8 Sukhanova str., Vladivostok 690041, Russia.|Institute of Automation and Control Processes, Far Eastern Branch, Russian Academy of Science, 5 Radio str., Vladivostok 690041, Russia.
authors.forename: Oleg
authors.initials: O
authors.lastname: Vitrik
authors.affiliation: Institute of Automation and Control Processes, Far Eastern Branch, Russian Academy of Science, 5 Radio str., Vladivostok 690041, Russia.
authors.forename: Yuri
authors.initials: Y
authors.lastname: Kulchin
authors.affiliation: ITMO University, St. Petersburg 197101, Russia.
authors.forename: Valentin
authors.initials: V
authors.lastname: Milichko
authors.affiliation: ITMO University, St. Petersburg 197101, Russia.
authors.forename: Sergey
authors.initials: S
authors.lastname: Makarov
authors.affiliation: ITMO University, St. Petersburg 197101, Russia.|Lebedev Physical Institute, Russian Academy of Science, Moscow 119991, Russia.
authors.forename: Sergey
authors.initials: S
authors.lastname: Kudryashov