Coherent optical phonon spectroscopy studies of femtosecond-laser modified Sb2 Te3 films

Yuwei Li; Vladimir A. Stoica; Lynn Endicott; Guoyu Wang; Ctirad Uher; Roy Clarke

doi:10.1063/1.3499742

Coherent optical phonon spectroscopy studies of femtosecond-laser modified Sb₂ Te₃ films

Yuwei Li
, Vladimir A. Stoica
, Lynn Endicott
, Guoyu Wang
, Ctirad Uher
, Roy Clarke

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

We performed time-resolved reflectivity measurements to monitor changes in optical phonon modes in Sb₂ Te₃ thin films under femtosecond laser irradiation. We found that a phonon mode at 3.64 THz appears after high-fluence laser irradiation, in addition to the phonon modes of Sb ₂ Te₃. We determined that the additional mode is due to Te segregation as a result of laser-induced decomposition of the Sb₂ Te₃ film. This experiment clearly illustrates the irreversible effects of femtosecond laser irradiation during the measurement of coherent optical phonon dynamics in Sb₂ Te₃.

Original language	English (US)
Article number	171908
Journal	Applied Physics Letters
Volume	97
Issue number	17
DOIs	https://doi.org/10.1063/1.3499742
State	Published - Oct 25 2010

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.3499742

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title = "Coherent optical phonon spectroscopy studies of femtosecond-laser modified Sb2 Te3 films",

abstract = "We performed time-resolved reflectivity measurements to monitor changes in optical phonon modes in Sb2 Te3 thin films under femtosecond laser irradiation. We found that a phonon mode at 3.64 THz appears after high-fluence laser irradiation, in addition to the phonon modes of Sb 2 Te3. We determined that the additional mode is due to Te segregation as a result of laser-induced decomposition of the Sb2 Te3 film. This experiment clearly illustrates the irreversible effects of femtosecond laser irradiation during the measurement of coherent optical phonon dynamics in Sb2 Te3.",

author = "Yuwei Li and Stoica, \{Vladimir A.\} and Lynn Endicott and Guoyu Wang and Ctirad Uher and Roy Clarke",

note = "Funding Information: This material is based on work supported as part of the Center for Solar and Thermal Energy Conversion, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences under Award No. DE-SC00000957.",

year = "2010",

month = oct,

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doi = "10.1063/1.3499742",

language = "English (US)",

volume = "97",

journal = "Applied Physics Letters",

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T1 - Coherent optical phonon spectroscopy studies of femtosecond-laser modified Sb2 Te3 films

AU - Li, Yuwei

AU - Stoica, Vladimir A.

AU - Endicott, Lynn

AU - Wang, Guoyu

AU - Uher, Ctirad

AU - Clarke, Roy

N1 - Funding Information: This material is based on work supported as part of the Center for Solar and Thermal Energy Conversion, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences under Award No. DE-SC00000957.

PY - 2010/10/25

Y1 - 2010/10/25

N2 - We performed time-resolved reflectivity measurements to monitor changes in optical phonon modes in Sb2 Te3 thin films under femtosecond laser irradiation. We found that a phonon mode at 3.64 THz appears after high-fluence laser irradiation, in addition to the phonon modes of Sb 2 Te3. We determined that the additional mode is due to Te segregation as a result of laser-induced decomposition of the Sb2 Te3 film. This experiment clearly illustrates the irreversible effects of femtosecond laser irradiation during the measurement of coherent optical phonon dynamics in Sb2 Te3.

AB - We performed time-resolved reflectivity measurements to monitor changes in optical phonon modes in Sb2 Te3 thin films under femtosecond laser irradiation. We found that a phonon mode at 3.64 THz appears after high-fluence laser irradiation, in addition to the phonon modes of Sb 2 Te3. We determined that the additional mode is due to Te segregation as a result of laser-induced decomposition of the Sb2 Te3 film. This experiment clearly illustrates the irreversible effects of femtosecond laser irradiation during the measurement of coherent optical phonon dynamics in Sb2 Te3.

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SN - 0003-6951

VL - 97

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 17

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ER -

Coherent optical phonon spectroscopy studies of femtosecond-laser modified Sb₂ Te₃ films

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