Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/18918
Title: Ultrafast dynamics and phase changes in phase change materials triggered by femtosecond laser
Authors: WANG QINFANG
Keywords: femtosecond laser, phase change media, nonthermal phase transition
Issue Date: 31-Jan-2006
Source: WANG QINFANG (2006-01-31). Ultrafast dynamics and phase changes in phase change materials triggered by femtosecond laser. ScholarBank@NUS Repository.
Abstract: This study investigated the interaction of femtosecond laser with phase change optical data storage media. The static experiment setup was employed to determine whether a single femtosecond laser pulse could induce amorphous or crystalline mark in phase change media or not. Our experiments show that even a single femtosecond pulse can induce and erase an amorphous mark in GeSbTe films. Using time resolved microscope, it was observed that a transient non-equilibrium state of the excited material in phase change media after femtosecond laser irradiation was formed in picoseconds time scale. An electronically induced non-thermal phase transition is suggested to be the mechanism of these ultrafast phase transitions.
URI: http://scholarbank.nus.edu.sg/handle/10635/18918
Appears in Collections:Ph.D Theses (Open)

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