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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 8 — Apr. 22, 2013
  • pp: 10222–10227

Femtosecond laser-irradiated crystallization of amorphous Si2Sb2Te3 films and its in-situ characterization by coherent phonon spectroscopy

Simian Li, Dong Zhou, Ting Wen, Weilin Zhu, Zhitang Song, and Tianshu Lai  »View Author Affiliations

Optics Express, Vol. 21, Issue 8, pp. 10222-10227 (2013)

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Femtosecond laser-irradiation-induced phase change of a new amorphous Si2Sb2Te3 film with a good thermal stability and low reset current is studied by coherent phonon spectroscopy. New coherent optical phonons (COP) occur as laser irradiation fluence reaches some threshold, implying laser-induced phase change emerged. The compositions in phase-changed area revealed by COP modes agree well with ones in reported annealed crystallized film, implying laser-induced phase change as crystallization. Pump fluence dependence of COP dynamics reveals good crystallization quality of the phase-changed film, exhibiting promising application of Si2Sb2Te3 films in optical phase change memory. Acoustic phonons are also found and identified.

© 2013 OSA

OCIS Codes
(160.2900) Materials : Optical storage materials
(210.4770) Optical data storage : Optical recording
(300.6500) Spectroscopy : Spectroscopy, time-resolved
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors

ToC Category:
Optical Data Storage

Original Manuscript: January 28, 2013
Revised Manuscript: April 10, 2013
Manuscript Accepted: April 12, 2013
Published: April 17, 2013

Simian Li, Dong Zhou, Ting Wen, Weilin Zhu, Zhitang Song, and Tianshu Lai, "Femtosecond laser-irradiated crystallization of amorphous Si2Sb2Te3 films and its in-situ characterization by coherent phonon spectroscopy," Opt. Express 21, 10222-10227 (2013)

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