Berlin 2008 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 36: Poster III

HL 36.10: Poster

Wednesday, February 27, 2008, 16:30–19:00, Poster D

Influence of metal structures on the optical properties of organic microcavities — •Maik Langner¹, Thomas Weimann², Hartmut Fröb¹, Vadim G. Lyssenko¹, and Karl Leo¹ — ¹Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany, www.iapp.de — ²Physikalisch-Technische Bundesanstalt AG 2.44, 38116 Braunschweig, Germany, www.ptb.de

Organic semiconductor microcavities combine the advantages of widely tunable light emission with a high gain and comparatively simple processing. For various reasons it is desirable to introduce metal structures into the standard OVCSEL design, e.g. current injection or additional lateral optical structuring due to the high index contrast. We show results of samples containing silver gratings on the micrometer and nanometer scale manufactured by means of shadow mask evaporation and electron beam lithography. They are embedded in a microcavity consisting of two highly reflective SiO₂ / TiO₂ - DBRs and a λ/2 -layer of the dye system Alq₃:DCM. To minimize absorption losses the metal is positioned near to the vertical field minimum at the interface DBR – cavity layer. For the optical investigations we use a microscope setup coupled to a spectrometer which allows for a sub-micron resolution. Changes of the optical properties are compared to FDTD simulations of the electric field distribution.