Studying time-dependent contribution of hot-electron versus lattice-induced thermal-expansion response in ultra-Thin Au-nanofilms
Journal
Applied Physics Letters
Journal Volume
117
Journal Issue
15
Date Issued
2020
Author(s)
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.
Type
journal article