Title :
Ultrafast phase transition dynamics in GeSb alloys
Author :
Kim, A.M.-T. ; Solis, J. ; Callan, J.P. ; Roeser, C.A.D. ; Mazur, E.
Author_Institution :
Dept. of Phys., Harvard Univ., Cambridge, MA, USA
Abstract :
We measure the femtosecond time resolved dielectric function of a-GeSb after excitation with an ultrashort laser pulse. The results reveal an ultrafast transition to a new non-thermodynamic phase which is not c-GeSb as previously believed. We present the most thorough experimental study to date of laser induced ultrafast phase transitions in GeSb alloys. We investigate the changes of the material by directly monitoring the full dielectric function over a broad energy range (1.7 eV - 3.5 eV) with 100 fs time resolution.
Keywords :
III-V semiconductors; dielectric function; germanium compounds; high-speed optical techniques; laser beam effects; solid-state phase transformations; 1.7 to 3.5 eV; 100 fs; GeSb; GeSb alloys; a-GeSb; broad energy range; femtosecond time resolved dielectric function; fs time resolution; full dielectric function; laser induced ultrafast phase transitions; non-thermodynamic phase; ultrafast phase transition dynamics; ultrafast transition; ultrashort laser pulse; Dielectric materials; Dielectric measurements; Laser excitation; Laser transitions; Monitoring; Optical materials; Optical pulses; Phase change materials; Pulse measurements; Time measurement;
Conference_Titel :
Nonlinear Optics: Materials, Fundamentals, and Applications, 2000. Technical Digest
Conference_Location :
Kaua´i-Lihue, HI, USA
Print_ISBN :
1-55752-646-X
DOI :
10.1109/NLO.2000.883604
