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

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 pres...

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Veröffentlicht in:Applied physics letters 2020-10, Vol.117 (15), Article 154101
Hauptverfasser: Wang, Peng-Jui, Shen, Chih-Chiang, Chou, Kuan-Yu, Ho, Mu-Han, Sheu, Jinn-Kong, Sun, Chi-Kuang
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Sprache:eng
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Zusammenfassung: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0023700