title: Photoinduced Electron Transfer in the Strong Coupling Regime: Waveguide-Plasmon Polaritons.
abstract: Reversible exchange of photons between a material and an optical cavity can lead to the formation of hybrid light-matter states where material properties such as the work function [ Hutchison et al. Adv. Mater. 2013 , 25 , 2481 - 2485 ], chemical reactivity [ Hutchison et al. Angew. Chem., Int. Ed. 2012 , 51 , 1592 - 1596 ], ultrafast energy relaxation [ Salomon et al. Angew. Chem., Int. Ed. 2009 , 48 , 8748 - 8751 ; Gomez et al. J. Phys. Chem. B 2013 , 117 , 4340 - 4346 ], and electrical conductivity [ Orgiu et al. Nat. Mater. 2015 , 14 , 1123 - 1129 ] of matter differ significantly to those of the same material in the absence of strong interactions with the electromagnetic fields. Here we show that strong light-matter coupling between confined photons on a semiconductor waveguide and localized plasmon resonances on metal nanowires modifies the efficiency of the photoinduced charge-transfer rate of plasmonic derived (hot) electrons into accepting states in the semiconductor material. Ultrafast spectroscopy measurements reveal a strong correlation between the amplitude of the transient signals, attributed to electrons residing in the semiconductor and the hybridization of waveguide and plasmon excitations.
authors.forename: Peng
authors.initials: P
authors.lastname: Zeng
authors.forename: Jasper
authors.initials: J
authors.lastname: Cadusch
authors.forename: Debadi
authors.initials: D
authors.lastname: Chakraborty
authors.forename: Trevor A
authors.initials: TA
authors.lastname: Smith
authors.forename: Ann
authors.initials: A
authors.lastname: Roberts
authors.forename: John E
authors.initials: JE
authors.lastname: Sader
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Davis
authors.affiliation: CSIRO, Private Bag 33, Clayton, Victoria 3168, Australia.
authors.forename: Daniel E
authors.initials: DE
authors.lastname: Gómez
mesh_terms: D004583:Electrons; D008670:Metals / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry*; D012666:Semiconductors; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D008670:Metals
keywords: Plasmonics; hot-charge carriers; strong coupling; ultrafast spectroscopy