SKM 2023 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 6: Poster

KFM 6.21: Poster

Tuesday, March 28, 2023, 17:00–19:00, P3

Time-resolved reflectivity measurements of Sb2Se3:Bi2Se3 alloys and Sb2S3 as studied by an ultrafast Optical Tester — •Ramon Pfeiffer, Maximilian Müller, Eric Lensker, and Matthias Wuttig — Institute of Physics (IA), RWTH Aachen University, 52074 Aachen, Germany

Laser-induced crystallization at a wavelength of 658 nm of alloys of Sb2Se3:Bi2Se3 has shown that the minimum crystallization time decreases with increasing Bi2Se3 content. This is, however, also accompanied by a reduction of the reflectance change upon crystallization. For higher Sb2Se3 contents, on the contrary, a slow and stochastic crystallization process was observed. Since Sb2Se3 has a much higher absorption coefficient at shorter wavelength, more efficient switching is expected with a blue laser diode. A similar consideration is made for Sb2S3 where hardly any light is absorbed below wavelength of about 600 nm. As a blue laser setup is much closer to the absorption maximum of Sb2S3, a better energy input is expected. For this reason, in our optical phase change tester, a blue laser diode (405 nm) has been implemented to investigate the materials mentioned above.