Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 64: Focus Session: Optical interconnects - Materials, devices, and integration

HL 64.7: Talk

Thursday, March 19, 2015, 12:30–12:45, EW 202

Characterisation of Hybrid VCSEL and DFB Organic Microlasers — •Tim Wagner, Markas Sudzius, Andreas Mischok, Hartmut Fröb, and Karl Leo — Institut für Angewandte Photophysik, Technische Universität Dresden, George-Bähr Str. 1, 01069 Dresden

Microlasers based on organic small molecules have shown great potential as coherent light sources [1,2]. Two important types of resonators being under investigation are the vertical-cavity surface-emitting laser (VCSEL) and the distributed-feedback laser (DFB). The gain medium in all structures produced is a blend of the red laser dye DCM doped by 2 wt% into the host material Alq₃. Although based on entirely different concepts, the two resonators exhibit comparable lasing thresholds and confinement factors.

In this work, we design a hybrid device combining both resonators in one compound structure, where second-order Bragg diffraction couples vertical modes of the VCSEL and lateral modes of the DFB. Using optical spectroscopy techniques, we analyse the emission properties and lasing characteristics to control the balance between the different mechanisms on positive optical feedback inside the composite system. Based on the results obtained, a novel structure is simulated and designed to optimise the performance of the hybridised microlaser device.

[1] I. Samuel and G. Turnbull Chemical Reviews 107, 1272 (2007)

[2] A. Mischok et al. Advanced Optical Materials 2, 802 (2014)