Optical detection of contact points (bright spots) for the propagation of acoustic waves within a monolayer of compressed translucent disks in four different crystal structures.

From the article:

Revealing the Structure of a Granular Medium through Ballistic Sound Propagation
S. Lherminier, R. Planet, G. Simon, L. Vanel, and O. Ramos
Phys. Rev. Lett. 113, 098001 (2014)

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