Berlin 2015 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Poster Session I

DS 36.13: Poster

Donnerstag, 19. März 2015, 09:30–12:00, Poster A

Setup and characterization of an optical tester for in-situ experiments on the switching behavior of phase-change materials — •Christoph Persch, Julia Benke, and Matthias Wuttig — 1.Physikalisches Institut IA, RWTH Aachen University, 52074 Aachen, Germany

Phase-change materials constitute a class of materials characterized by a pronounced difference in physical properties between the crystalline and the amorphous phase. The crystalline state usually features a low electric resistance and a high reflectivity while the amorphous state features a high electric resistance and a low reflectivity. As phase transitions are inherently fast, phase-change materials are of great interest for non-volatile memory applications, such as solid state PC-RAM or optical storage media.

To investigate the switching behavior of phase-change materials, a measurement setup comprised of a pulse-probe laser system and a detection unit has been established. To induce phase transition by thermal activation, the high-power pulse laser (405nm) generates flat-top nanosecond pulses. The change in reflectivity is measured simultaneously with a bandwidth of 1.2 GHz, using the probe laser (445nm) and the detection unit. In addition, the measurement setup is thoroughly analyzed regarding its performance characteristics to allow for precise and reliable experiments.