Paul H. Otsuka

TL;DR: An ultrafast technique is implemented to probe the wave field evolution in straight and L-shaped phononic crystal surface-phonon waveguides in real- and k-space in two spatial dimensions, thus revealing the eigenstate-energy redistribution processes and the coupling between different frequency-degenerate eigenstates.

TL;DR: In this article, the authors used picosecond ultrasonics to image animal cells in vitro, including a bovine aortic endothelial cell and a mouse adipose cell fixed to Ti-coated sapphire.

TL;DR: This work image gigahertz zero-group-velocity Lamb waves in the time domain by means of an ultrafast optical technique, revealing their stationary nature and their acoustic energy localization.

TL;DR: This work significantly narrows the lateral resolution for focusing of picosecond acoustic pulses, normally limited by the diffraction limit of focused optical pulses to ~1 μm, and thereby opens up a new range of possibilities including nanoscales acoustic microscopy and nanoscale computed tomography.

TL;DR: In this article, the authors extend time-domain imaging in acoustic metamaterials to gigahertz frequencies by using a sample consisting of a regular array of ∼1 μ diameter silicamicrospheres forming a two-dimensional triangular lattice on a substrate.