Studying time-dependent contribution of hot-electron versus lattice-induced thermal-expansion response in ultra-Thin Au-nanofilms

Peng Jui Wang; Chih Chiang Shen; Kuan Yu Chou; Mu Han Ho; Jinn Kong Sheu; Chi Kuang Sun

doi:10.1063/5.0023700

Studying time-dependent contribution of hot-electron versus lattice-induced thermal-expansion response in ultra-Thin Au-nanofilms

Peng Jui Wang, Chih Chiang Shen, Kuan Yu Chou, Mu Han Ho, Jinn Kong Sheu, Chi Kuang Sun

Department of Photonics

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

6 Citations (Scopus)

Abstract

Through the femtosecond-Time-resolved study of photoacoustic pulse generation in ultra-Thin gold nanofilms, we observed a time delay of 0.5-0.7 ps in the formation of thermal-expansion pulses after photoexcitation. Our observation indicates that lattice anharmonicity dominates over hot electron pressure in the thermal expansion of Au nanofilms under ultrashort-pulsed photoexcitation.

Original language	English
Article number	154101
Journal	Applied Physics Letters
Volume	117
Issue number	15
DOIs	https://doi.org/10.1063/5.0023700
Publication status	Published - 2020 Oct 12

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/5.0023700

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title = "Studying time-dependent contribution of hot-electron versus lattice-induced thermal-expansion response in ultra-Thin Au-nanofilms",

abstract = "Through the femtosecond-Time-resolved study of photoacoustic pulse generation in ultra-Thin gold nanofilms, we observed a time delay of 0.5-0.7 ps in the formation of thermal-expansion pulses after photoexcitation. Our observation indicates that lattice anharmonicity dominates over hot electron pressure in the thermal expansion of Au nanofilms under ultrashort-pulsed photoexcitation. ",

author = "Wang, {Peng Jui} and Shen, {Chih Chiang} and Chou, {Kuan Yu} and Ho, {Mu Han} and Sheu, {Jinn Kong} and Sun, {Chi Kuang}",

note = "Funding Information: The authors appreciate Po-Hsun Liao for providing technical support. This work was sponsored by the Ministry of Science and Technology of Taiwan, under MOST No. 106–2112-M-002-004-MY3. Publisher Copyright: {\textcopyright} 2020 Author(s).",

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doi = "10.1063/5.0023700",

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AU - Wang, Peng Jui

AU - Shen, Chih Chiang

AU - Chou, Kuan Yu

AU - Ho, Mu Han

AU - Sheu, Jinn Kong

AU - Sun, Chi Kuang

N1 - Funding Information: The authors appreciate Po-Hsun Liao for providing technical support. This work was sponsored by the Ministry of Science and Technology of Taiwan, under MOST No. 106–2112-M-002-004-MY3. Publisher Copyright: © 2020 Author(s).

PY - 2020/10/12

Y1 - 2020/10/12

N2 - Through the femtosecond-Time-resolved study of photoacoustic pulse generation in ultra-Thin gold nanofilms, we observed a time delay of 0.5-0.7 ps in the formation of thermal-expansion pulses after photoexcitation. Our observation indicates that lattice anharmonicity dominates over hot electron pressure in the thermal expansion of Au nanofilms under ultrashort-pulsed photoexcitation.

AB - Through the femtosecond-Time-resolved study of photoacoustic pulse generation in ultra-Thin gold nanofilms, we observed a time delay of 0.5-0.7 ps in the formation of thermal-expansion pulses after photoexcitation. Our observation indicates that lattice anharmonicity dominates over hot electron pressure in the thermal expansion of Au nanofilms under ultrashort-pulsed photoexcitation.

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Studying time-dependent contribution of hot-electron versus lattice-induced thermal-expansion response in ultra-Thin Au-nanofilms

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