infrared millimeter terahertz waves scientific conferences

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 because of strong absorption in water. The excitation of a large-area water surface irradiated by loosely focused THz light produces a plane photoacoustic wave. The photoacoustic wave is generated by incident THz light with a small radiant exposure of <1 mJ/cm2 and delivered 100 times deeper than the penetration depth of THz light for water. The THz-light-induced plane photoacoustic wave offers great advantages to non-invasive imaging for industrial and biological applications.