title: Femtosecond laser fabrication of microfluidic channels for organic photonic devices.
abstract: We report on innovative application of microchannels with access holes fabricated by femtosecond laser irradiation followed by chemical etching. This technique allows us to demonstrate a novel approach to the achievement of organic photonic devices in which the properties of a conjugated polymer in solution are exploited in a microfluidic configuration to produce an easy-to-integrate photonic device. Filling the microchannel with a diluted polyfluorene solution, we exploit the unique properties of isolated polymeric chains such as ultrafast gain switching (switching response time of 150 fs) with a 100% on-off ratio. In addition, by dispersing nanoparticles in the polymeric solution we are able to achieve random lasing in the microchannel.
authors.affiliation: Dipartimento di Fisica, Istituto di Fotonica e Nanotecnologie, CNR, Politecnico di Milano,Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
authors.forename: Krishna
authors.initials: K
authors.lastname: Chaitanya Vishnubhatla
authors.forename: Jenny
authors.initials: J
authors.lastname: Clark
authors.forename: Guglielmo
authors.initials: G
authors.lastname: Lanzani
authors.forename: Roberta
authors.initials: R
authors.lastname: Ramponi
authors.forename: Roberto
authors.initials: R
authors.lastname: Osellame
authors.forename: Tersilla
authors.initials: T
authors.lastname: Virgili