Dynamic Speckle Holography

S. Aime (1, 2) , M. Sabato (2, 3) , L. Xiao (4) , D.  A. Weitz (2, 5)

1 C3M - Chimie Moléculaire, Macromoléculaire et Matériaux (UMR7167)
2 SEAS - Harvard John A. Paulson School of Engineering and Applied Sciences
3 University of Chicago
4 China University of Petroleum
5 Harvard University

We introduce Dynamic Speckle Holography (DSH), a new technique that combines imaging and scattering to measure three dimensional maps of displacements as small as ten nanometers over several centimeters, greatly extending the capabilities of traditional imaging systems. We attain this sensitivity by imaging speckle patterns of light collected at three scattering angles and measuring the decay in the temporal correlation due to local motion. We use DSH to measure the strain field of a colloidal gel undergoing fracture and establish the surprising role of internal tension in driving the fracture.

Domaines: Polymères; Matière Molle [cond-mat.soft]; Mécanique des fluides [physics.class-ph]; Instrumentations et Détecteurs [physics.ins-det]; Optique [physics.optics]

S. Aime, M. Sabato, L. Xiao, D.  A. Weitz. Dynamic Speckle Holography. Physical Review Letters, 2021, 127 (8), pp.088003. ⟨10.1103/PhysRevLett.127.088003⟩. ⟨hal-03376029⟩