Over the last decade, the development of high-power ultrafast laser systems led to the emergence of intense pioseconds terahertz (THz) pulses, which provide a new tool for studying fundamental aspects of light-matter interactions by driving out-of-equilibrium electrons, phonons or magnons at ultrafast time scale. Thanks to spectral weight in the THz frequency range, it is possible to directly couple light to infrared-active optical phonon mode in solid and it has been widely demonstrated and studied in various materials. However, only sparse and incomplete reports are available on THz-induced coherent acoustics phonons and none of them clearly demonstrate the origin of coherent acoustics phonons generation. Here, we report on the generation of coherent acoustic phonons in materials with terahertz ultrashort pulses. This is demonstrated in metals and topological insulators by exciting acoustic eigenmode in nanometric sized thin films.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.