Open AccessObservation of the femtosecond laser-induced ultrafast amorphization in Ge2Sb2Te5 films by dynamics spectrum
Author(s) -
Ying Hao Wang,
Fu Rong Liu
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1676/1/012161
Subject(s) - femtosecond , ultrashort pulse , laser , materials science , wavelength , absorption (acoustics) , absorption spectroscopy , femtosecond pulse , pulse (music) , optics , ultrafast laser spectroscopy , atomic physics , optoelectronics , physics , composite material , detector
We demonstrate ultrafast amorphization in a Ge2Sb2Te5 (GST) film through a nonthermal process by femtosecond pump-probe experiments. A strong absorption peak in 532 nm is founded during the amorphization and the energy level corresponded is about 0.65~3.82 eV by calculations. First-Principles Calculations simulation experiments are used to prove the results of experiment and then explain the mechanism of amorphization of GST. Also, results of experiments show that the time to reach the absorption peak is decided by pulse width and wavelength but not the laser influence.