Efficient ultrafast photoacoustic transduction on Tantalum thin films

Abstract Nano-acoustic strain generation in thin metallic films via ultrafast laser excitation is widely used material science, imaging and medical applications. Recently, it was shown that transition metals, such as titanium, exhibit enhanced photoacoustic transduction properties compared to noble silver. This work presents experimental results simulations demonstrate among metals tantalum exhibits superior properties. Experiments of nano-acoustic by femtosecond pulses focused on deposited Silicon substrates are presented. The strains measured pump-probe transient reflectivity captures the Brillouin oscillations produced photon–phonon interactions. observed correlated efficiency film performance titanium films, clearly demonstrating tantalum. findings supported computational laser-induced their propagation these metal film/substrate systems using a two-temperature model combination with thermo-mechanical finite element analysis. Finally, role transducer-substrate acoustic impedance matching discussed possibility generate appropriately modulated pulse trains inside crystalline substrate structures for development undulators γ-ray