Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 97: Semiconductor laser II: Microcavities and quantum-dot laser

HL 97.2: Vortrag

Donnerstag, 3. April 2014, 15:45–16:00, POT 051

Bloch-like Photonic States in Laterally Structured Organic Microcavities — •Andreas Mischok1, Robert Brückner1, Alexander A. Zakhidov2, Vadim G. Lyssenko1, Hartmut Fröb1, and Karl Leo11Institut für Angewandte Photophysik, TU Dresden, George-Bähr Str. 1, 01069 Dresden, Germany — 2Fraunhofer COMEDD, Maria-Reiche-Str. 2, 01109 Dresden, Germany

Organic microcavities offer broad spectral coverage and low lasing thresholds with comparably simple preparation techniques. In this work, a highly fluorescent laser dye (DCM) is doped into a matrix material (Alq3 ) and sandwiched between distributed Bragg reflectors, creating a high-quality cavity emitting around 590-680nm. Introducing an almost non-absorptive SiO2 layer next to the cavity, we are able to shape the photonic landscape in the cavity by micron-scale lateral structuring via photolithography. Periodic stripes in this layer create a periodic array of photonic potential wells, evoking memories of the crystal potential observed for electrons in solid state materials. This structuring creates a mode spectrum showing great similarity to Bloch states, reproducing confined modes below the confining potential and extended modes exhibiting mini-bands and mini-bandgaps above. Numerical simulations and analytical calculations provide further insight into the device as an easily accessible model for quantum mechanical effects in macroscopic systems. Lasing can be observed in a multitude of confined states - tunable by modifying the optical excitation patterns.

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