Dynamic strain evolution in an optically excited Pt thin film

The structural evolution of a Pt thin film following photo-thermal excitation by 1 ps optical laser pulses was studied with a time resolution of 100 ps over a total time period of 1 ms. Laser pulse fluences below 50 mJ/cm2 were insufficient to relax the residual stress state of the as-prepared film...

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Autores principales:	M. F. DeCamp, A. D. DiChiara, K. M. Unruh
Formato:	article
Lenguaje:	EN
Publicado:	AIP Publishing LLC 2021
Materias:	Physics QC1-999
Acceso en línea:	https://doaj.org/article/29dbe944cc2343d59971140ba3702a9b
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spelling	oai:doaj.org-article:29dbe944cc2343d59971140ba3702a9b2021-12-01T18:52:06ZDynamic strain evolution in an optically excited Pt thin film2158-322610.1063/5.0067770https://doaj.org/article/29dbe944cc2343d59971140ba3702a9b2021-11-01T00:00:00Zhttp://dx.doi.org/10.1063/5.0067770https://doaj.org/toc/2158-3226The structural evolution of a Pt thin film following photo-thermal excitation by 1 ps optical laser pulses was studied with a time resolution of 100 ps over a total time period of 1 ms. Laser pulse fluences below 50 mJ/cm2 were insufficient to relax the residual stress state of the as-prepared film even after 10 000 pulses. In this fluence regime, a rapid initial lattice expansion and a decrease in the lattice coherence length due to ultrafast photo-thermal heating were observed. The lattice expansion reached a maximum, and the coherence length reached a minimum, 100–200 ps after excitation before monotonically decaying back to their initial values in about 1 µs. Laser pulse fluences greater than 50 mJ/cm2 produced irreversible stress relaxation within the first 10 optical pulses. In this regime, the lattice expansion was qualitatively similar to that in the low fluence regime, except that the initial structural state was not recovered. The evolution in the coherence length, however, was more complex. Following an initial decrease similar to that observed at low fluence, the coherence length then increased to a broad maximum greater than the initial value, before recovery.M. F. DeCampA. D. DiChiaraK. M. UnruhAIP Publishing LLCarticlePhysicsQC1-999ENAIP Advances, Vol 11, Iss 11, Pp 115111-115111-5 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999
spellingShingle	Physics QC1-999 M. F. DeCamp A. D. DiChiara K. M. Unruh Dynamic strain evolution in an optically excited Pt thin film
description	The structural evolution of a Pt thin film following photo-thermal excitation by 1 ps optical laser pulses was studied with a time resolution of 100 ps over a total time period of 1 ms. Laser pulse fluences below 50 mJ/cm2 were insufficient to relax the residual stress state of the as-prepared film even after 10 000 pulses. In this fluence regime, a rapid initial lattice expansion and a decrease in the lattice coherence length due to ultrafast photo-thermal heating were observed. The lattice expansion reached a maximum, and the coherence length reached a minimum, 100–200 ps after excitation before monotonically decaying back to their initial values in about 1 µs. Laser pulse fluences greater than 50 mJ/cm2 produced irreversible stress relaxation within the first 10 optical pulses. In this regime, the lattice expansion was qualitatively similar to that in the low fluence regime, except that the initial structural state was not recovered. The evolution in the coherence length, however, was more complex. Following an initial decrease similar to that observed at low fluence, the coherence length then increased to a broad maximum greater than the initial value, before recovery.
format	article
author	M. F. DeCamp A. D. DiChiara K. M. Unruh
author_facet	M. F. DeCamp A. D. DiChiara K. M. Unruh
author_sort	M. F. DeCamp
title	Dynamic strain evolution in an optically excited Pt thin film
title_short	Dynamic strain evolution in an optically excited Pt thin film
title_full	Dynamic strain evolution in an optically excited Pt thin film
title_fullStr	Dynamic strain evolution in an optically excited Pt thin film
title_full_unstemmed	Dynamic strain evolution in an optically excited Pt thin film
title_sort	dynamic strain evolution in an optically excited pt thin film
publisher	AIP Publishing LLC
publishDate	2021
url	https://doaj.org/article/29dbe944cc2343d59971140ba3702a9b
work_keys_str_mv	AT mfdecamp dynamicstrainevolutioninanopticallyexcitedptthinfilm AT addichiara dynamicstrainevolutioninanopticallyexcitedptthinfilm AT kmunruh dynamicstrainevolutioninanopticallyexcitedptthinfilm
_version_	1718404681518022656

Dynamic strain evolution in an optically excited Pt thin film

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