We study the properties of waves in complex materials where the waves are scattered many
times before leaving the medium. Wave phenomena in these systems can be radically different
to those normally associated with waves, and are attracting growing interest. We use
innovative ultrasonic techniques, developed in our laboratory, to study these wave
phenomena for acoustic and elastic waves. Our goals are both to discover and understand
novel aspects of wave propagation in strongly scattering media, and to use our knowledge
of wave scattering to develop new experimental probes of the structure and dynamics of
strongly scattering materials.
We also use our ultrasonic techniques to study a wide range of mesoscopic materials, whose
physical properties are determined by internal structures on length scales intermediate
between atomic dimensions and bulk. Some examples include fluidized suspensions, phononic
crystals, porous materials, and biological materials of importance in food science.