Plane photoacoustic wave generation in liquid water by THz-FEL
- Resource Type
- Conference
- Authors
- Tsubouchi, Masaaki; Hoshina, Hiromichi; Nagai, Masaya; Isoyama, Goro
- Source
- 2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2020 45th International Conference on. :1-2 Nov, 2020
- Subject
- Aerospace
Bioengineering
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Engineered Materials, Dielectrics and Plasmas
Fields, Waves and Electromagnetics
Photonics and Electrooptics
Signal Processing and Analysis
Liquids
Absorption
Propagation
Free electron lasers
Biological tissues
Laser modes
Laser excitation
- Language
- ISSN
- 2162-2035
We demonstrate photoacoustic wave propagation with a plane wavefront in liquid water using a terahertz (THz) laser pulse. The THz light can effectively generate the photoacoustic wave in water because of strong absorption via a stretching vibration mode of the hydrogen bonding network. The excitation of a large-area water surface irradiated by loosely focused THz light produces a plane photoacoustic wave. The photoacoustic wave generation and plane wave propagation are observed using a system with a THz free-electron laser and shadowgraph imaging. The plane photoacoustic wave is generated by incident THz light with a small radiant exposure of