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

Research output: Contribution to journalArticlepeer-review

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 languageEnglish
Article number154101
JournalApplied Physics Letters
Volume117
Issue number15
DOIs
Publication statusPublished - 2020 Oct 12

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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