title: Two-photon excited fluorescence from a pseudoisocyanine-attached gold tip via a plasmonic-photonic hybrid system.
abstract: A plasmonic-photonic hybrid system with efficient coupling of light from a fiber-coupled microspherical cavity to localized surface plasmon (LSP) modes of a gold-coated tip was proposed, which was composed of a fiber-coupled microspherical cavity and a pseudoisocyanine (PIC)-attached gold tip. To prove efficient excitation of LSP at the gold-coated tip, we experimentally demonstrated two-photon excited fluorescence from the PIC-attached gold-coated tip via a fiber-coupled microspherical cavity under a weak continuous wave excitation condition. This hybrid system could focus the incident light with coupling efficiency of around 64% into a nanoscale domain of the metal tip with an effective area of a 79-nm circle.
authors.forename: Fang
authors.initials: F
authors.lastname: Ren
authors.forename: Hideaki
authors.initials: H
authors.lastname: Takashima
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Tanaka
authors.forename: Hideki
authors.initials: H
authors.lastname: Fujiwara
authors.forename: Keiji
authors.initials: K
authors.lastname: Sasaki