Seismic Metamaterial, Plenary Lecture by Richard Craster (Imperial College London)

DENORMS Action’s Workshop “Modelling of high performance acoustic structures Porous media, metamaterials and sonic crystals”, Rome, 24-25th January 2017

Website of DENORMS Action

Programme of the Workshop

Session on New trends in vibroacoustics (i.e. elastic metamaterials and metasurfaces)

Speaker: Richard Craster (Imperial College London)

Abstract:

It has been known for many years now that one can develop metamaterials in electromagnetism and, at least in theory, steer and manipulate waves in optics and electromagnetism; although in reality the various losses in real materials do limit the effectiveness. This is all at the nanoscale, elasticity and acoustics, on the other hand, are typically at far longer scales and the effect of losses can be less. I will consider two different models: one based on subwavelength resonators to generate mode conversion from surface to bulk waves which is truly a metamaterial and then I will introduce a seismic metamaterial based on periodic media with an ultra-low and wide bandgap that will stop very long waves from propagating, so subwavelength in some sense but not using resonators.