title: Active control of the strong coupling regime between porphyrin excitons and surface plasmon polaritons.
abstract: We experimentally demonstrate the active control of the coupling strength between porphyrin dyes and surface plasmon polaritons supported by a thin gold layer. This control is externally exerted by a gas flow and is reversible. The hybridized exciton-polariton branches resulting from the exciton-plasmon coupling display a splitting proportional to the coupling strength of the light-matter interaction. The coupled system changes from the weak (no splitting) to the strong coupling regime (splitting of 130 meV) by controlling the effective oscillator strength in the dye layer, via exposure to nitrogen dioxide. The modification of the coupling strength of the system allows tailoring of the dispersion of the hybridized modes as well as of their group velocity.
authors.affiliation: Centre for Nanophotonics, FOM Institute AMOLF c/o Philips Research Laboratories, High Tech Campus 4, 5656 AE Eindhoven, The Netherlands. a.berrier@amolf.nl
authors.forename: Audrey
authors.initials: A
authors.lastname: Berrier
authors.forename: Ruud
authors.initials: R
authors.lastname: Cools
authors.forename: Christophe
authors.initials: C
authors.lastname: Arnold
authors.forename: Peter
authors.initials: P
authors.lastname: Offermans
authors.forename: Mercedes
authors.initials: M
authors.lastname: Crego-Calama
authors.forename: Sywert H
authors.initials: SH
authors.lastname: Brongersma
authors.forename: Jaime
authors.initials: J
authors.lastname: Gómez-Rivas
mesh_terms: D004396:Coloring Agents / Q000737:chemistry*; D004583:Electrons; D009585:Nitrogen Dioxide / Q000737:chemistry; D055620:Optical Phenomena; D011166:Porphyrins / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D004396:Coloring Agents; D011166:Porphyrins; D009585:Nitrogen Dioxide