Ultrafast sub-threshold photo-induced response in crystalline and amorphous GeSbTe thin films

M. J. Shu; I. Chatzakis; Y. Kuo; P. Zalden; A. M. Lindenberg

doi:10.1063/1.4807731

Ultrafast sub-threshold photo-induced response in crystalline and amorphous GeSbTe thin films

M. J. Shu, I. Chatzakis, Y. Kuo, P. Zalden, A. M. Lindenberg

Physics

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

Pump-probe optical reflectivity and terahertz transmission measurements have been used to investigate time resolved sub-threshold photo-induced effects in crystalline and amorphous GeSbTe films at MHz repetition rates. The reflectivity in both phases exhibits long-lived modulations consistent with the sign of the changes that occur upon switching but of smaller magnitude. These can be understood by the generation of acoustic strains with the crystalline phase response dominated by thermal effects and the amorphous phase response associated with electronically induced changes. Evidence for a photo-induced distortion is observed in the amorphous phase which develops homogeneously within the excited region on few-picosecond time scales.

Original language	English
Article number	201903
Journal	Applied Physics Letters
Volume	102
Issue number	20
DOIs	https://doi.org/10.1063/1.4807731
State	Published - May 20 2013

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abstract = "Pump-probe optical reflectivity and terahertz transmission measurements have been used to investigate time resolved sub-threshold photo-induced effects in crystalline and amorphous GeSbTe films at MHz repetition rates. The reflectivity in both phases exhibits long-lived modulations consistent with the sign of the changes that occur upon switching but of smaller magnitude. These can be understood by the generation of acoustic strains with the crystalline phase response dominated by thermal effects and the amorphous phase response associated with electronically induced changes. Evidence for a photo-induced distortion is observed in the amorphous phase which develops homogeneously within the excited region on few-picosecond time scales.",

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note = "Funding Information: Research was supported by the U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division. Y.K. was supported by DARPA grant N66001-10-1-4021. P.Z. wishes to acknowledge financial support by the Alexander von Humboldt foundation.",

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AU - Zalden, P.

AU - Lindenberg, A. M.

N1 - Funding Information: Research was supported by the U.S. Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division. Y.K. was supported by DARPA grant N66001-10-1-4021. P.Z. wishes to acknowledge financial support by the Alexander von Humboldt foundation.

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N2 - Pump-probe optical reflectivity and terahertz transmission measurements have been used to investigate time resolved sub-threshold photo-induced effects in crystalline and amorphous GeSbTe films at MHz repetition rates. The reflectivity in both phases exhibits long-lived modulations consistent with the sign of the changes that occur upon switching but of smaller magnitude. These can be understood by the generation of acoustic strains with the crystalline phase response dominated by thermal effects and the amorphous phase response associated with electronically induced changes. Evidence for a photo-induced distortion is observed in the amorphous phase which develops homogeneously within the excited region on few-picosecond time scales.

AB - Pump-probe optical reflectivity and terahertz transmission measurements have been used to investigate time resolved sub-threshold photo-induced effects in crystalline and amorphous GeSbTe films at MHz repetition rates. The reflectivity in both phases exhibits long-lived modulations consistent with the sign of the changes that occur upon switching but of smaller magnitude. These can be understood by the generation of acoustic strains with the crystalline phase response dominated by thermal effects and the amorphous phase response associated with electronically induced changes. Evidence for a photo-induced distortion is observed in the amorphous phase which develops homogeneously within the excited region on few-picosecond time scales.

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Ultrafast sub-threshold photo-induced response in crystalline and amorphous GeSbTe thin films

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