Observation of Femtosecond Acoustic Anomaly in a Solid Liquid Interface

Chi Kuang Sun*, Yi Ting Yao, Chih Chiang Shen, Mu Han Ho, Tien Chang Lu, Jinn Kong Sheu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Here we report a femtosecond anomaly observed at a solid-liquid interface: femtosecond acoustic echo being advanced by the application of a viscous liquid to the solid surface. Through extensive simulation and experiments, we attribute this new discovery to the effect introduced by the surface-adsorbed water layer, switching between properties more viscous than water and more solid-like than ice. Our study further indicates a new technology paradigm: the femtosecond acoustic system to probe the viscoelastic properties of the surface-adsorbed water layer, which is not achievable by any available current technology.

Original languageEnglish
Pages (from-to)2987-2993
Number of pages7
JournalJournal of Physical Chemistry C
Issue number5
StatePublished - 6 Feb 2020

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