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We demonstrate photoacoustic wave propagation with a plane wavefront inliquid water using a terahertz (THz) laser pulse. The THz light can effectivelygenerate the photoacoustic wave in water because of strong absorption via astretching vibration mode of the hydrogen bonding network. The excitation of alarge-area water surface irradiated by loosely focused THz light produces aplane photoacoustic wave. This is in contrast with conventional methods usingabsorbers or plasma generation using near-infrared laser light. Thephotoacoustic wave generation and plane wave propagation are observed using asystem with a THz free-electron laser and shadowgraph imaging. The planephotoacoustic wave is generated by incident THz light with a small radiantexposure of <1 mJ/cm2 and delivered 600 times deeper than the penetration depthof THz light for water. The THz-light-induced plane photoacoustic wave offersgreat advantages to non-invasive operations for industrial and biologicalapplications as demonstrated in our previous report (Yamazaki et al, Sci. Rep.846295 (2020)).

Plane photoacoustic wave generation in liquid water using irradiation of terahertz pulses