Abstract
Surface Brillouin scattering (SBS) has been used to examine the elastic properties of a supported gold film at high pressure. The velocities of the acoustic modes of a 99 nm thick film have been measured to a pressure of 4.8 GPa, by means of a gem anvil cell with cubic zirconia anvils. A large stiffening of the film has been detected, most clearly revealed by an increase in the value of the ${c}_{44}$ elastic constant. The work demonstrates the potential of the SBS technique in high-pressure studies of the elastic properties of opaque materials.
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