title: Strong coupling and laser action of ladder-type oligo(p-phenylene)s in a microcavity.
abstract: We investigate the coupling of ladder-type quarterphenyl to the photon modes of a dielectric ZrOx /SiOx microcavity at ultraviolet wavelengths. For a relatively long cavity (≈10 μm) with high-reflectivity mirrors (0.998), optically pumped laser action is demonstrated in the weak-coupling regime. We observe single-mode operation with a threshold of 0.4 mJ cm(-2) . Strong coupling is achieved by using a short λ/2 cavity. We find pronounced anti-crossing features of the molecular (0,0) and (0,1) vibronic transitions and the cavity mode in angle-dependent reflectivity measurements providing Rabi splittings of (90±10) meV. All these features occur spectrally resonant to the exciton transition of ZnO demonstrating the potential of ladder-type oligo(p-phenylene)s for the construction of inorganic/organic hybrid microcavities.
authors.affiliation: Department of Physics, Humboldt-Universtät zu Berlin, Newtonstr. 15, 12489 Berlin (Germany). michael.hoefner@physik.hu-berlin.de.
authors.forename: Michael
authors.initials: M
authors.lastname: Höfner
authors.forename: Björn
authors.initials: B
authors.lastname: Kobin
authors.forename: Stefan
authors.initials: S
authors.lastname: Hecht
authors.forename: Fritz
authors.initials: F
authors.lastname: Henneberger
keywords: coupling; lasing molecules; microcavity; phenylenes; strong coupling