Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Poster IA (Ultrafast phenomena; Optical properties; Transport; Theory)

HL 20.7: Poster

Montag, 16. März 2015, 15:00–20:00, Poster B

Control of Lasing from Bloch-States in Microcavity Photonic Wires via Selective Excitation and Gain — •Andreas Mischok¹, Robert Brückner¹, Alexander A. Zakhidov^1,2, Hartmut Fröb¹, Vadim G. Lyssenko¹, and Karl Leo¹ — ¹Institut für Angewandte Photophysik, Technische Universität Dresden, George-Bähr Str. 1, 01069 Dresden — ²Texas State University, 601 University Drive, San Marcos, Texas, United States

Organic microcavities comprising the host:guest emitter system Alq₃:DCM offer an interesting playground to experimentally study the full dispersion characteristics of laterally patterned surface emitting lasers due to the broad emission spectrum and high quantum efficiency of the organic dye. By structuring directly on top of the bottom distributed Bragg reflector, we are able to precisely manipulate the mode structure and influence the coherent emission properties of the device. Adding SiO₂ photonic wire structures into an organic microcavity, we create an additional lateral confinement and a Bloch-like band-structure in the dispersion of periodically patterned cavities. We experimentally observe spontaneous and stimulated emission from the ground and different excited discrete states at room temperature. By changing the spatial gain distribution via a two beam interference, we are able to directly control the laser emission from both extended and confined modes of such organic photonic wires. Both spatial distribution and dispersion exhibit coherent emission from tunable modes, which we describe with an analytical model and numerical simulations, in perfect agreement with our measurements.