Berlin 2001 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 18: Poster: Polymer Blends, Heterogeneous Systems, Colloids and Nanoparticles, Interfaces, Polyelectrolytes
CPP 18.16: Poster
Wednesday, April 4, 2001, 12:30–15:00, AT1
Organic random laser utilizing a two-dimensional colloidal crystal — •Stefan Riechel1, Carmen Klingler-Deiseroth1, Uli Lemmer1, Jochen Feldmann1, Anton G. Mückl2, and Wolfgang Brütting2 — 1Lehrstuhl für Photonik und Optoelektronik, Ludwig-Maximilians-Universität München, Amalienstr. 54, 80799 München — 2Lehrstuhl Experimentalphysik II, Universität Bayreuth, Universitätsstr. 30, 95440 Bayreuth
We report on the realisation of an optically pumped organic random laser. Using a self-assembly technique monolayers of a two-dimensional colloidal crystal are fabricated from a dispersion of polystyrene beads. On top of the colloidal crystal a thin film of the organic semiconductor laser material Alq3:DCM is deposited by thermal evaporation in high vacuum. Above a threshold excitation intensity an increasingly large number of spectrally narrow laser modes appears in the emission spectrum. These features indicate feedback due to multiple scattering and the formation of random closed loop paths.