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  • Vol. 37, Iss. 13 — Jul. 1, 2012
  • pp: 2691–2693

Nonequilibrium phase change in gold films induced by ultrafast laser heating

Yong Gan and J. K. Chen  »View Author Affiliations


Optics Letters, Vol. 37, Issue 13, pp. 2691-2693 (2012)
http://dx.doi.org/10.1364/OL.37.002691


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Abstract

Ultrafast laser-induced melting in a gold thin film is simulated by an integrated continuum-atomistic method with the extended Drude model for dynamic optical properties. The local order parameter of atoms is used to identify solid and liquid regions. It is shown that the film is superheated in the early nonequilibrium stage and the melted region grows very quickly with a very high rate of melting up to 13,300m/s. It is also found that the continuum approach could significantly underestimate the ultrafast phase-change response, and temperature-dependent optical properties should be considered in atomic-level modeling for ultrafast laser heating.

© 2012 Optical Society of America

OCIS Codes
(140.3390) Lasers and laser optics : Laser materials processing
(320.7090) Ultrafast optics : Ultrafast lasers
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors

ToC Category:
Ultrafast Optics

History
Original Manuscript: March 8, 2012
Revised Manuscript: May 3, 2012
Manuscript Accepted: May 18, 2012
Published: June 26, 2012

Citation
Yong Gan and J. K. Chen, "Nonequilibrium phase change in gold films induced by ultrafast laser heating," Opt. Lett. 37, 2691-2693 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-13-2691


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