Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Poster: Colloids and Complex Liquids

CPP 16.3: Poster

Tuesday, March 27, 2012, 18:15–20:45, Poster A

Phase behavior of colloidal monolayers on one-dimensional periodic and quasiperiodic light fields — •Lamiss Zaidouny and Clemens Bechinger — 2. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany

Phase transitions of colloidal monolayers on light-induced substrate potentials have been demonstrated to provide novel insights into the phase behavior of two-dimensional systems on patterned surfaces. Due to the interplay of repulsive interparticle forces and their interaction with the substrate, interesting structures will form which are also observed in atomic systems. Here, we study the phase transitions of charged colloidal particles on arrays composed of one-dimensional laser lines which are created by a scanned laser beam whose diameter is highly asymmetric by passing a cylindrical lens. This allows the creation of laser lines with periodic and quasi-periodic order. In addition, to revisit light-induced freezing and melting, we present first results on how colloidal monolayers form in the presence of one-dimensional periodic potentials