Multispeckle diffusing-wave spectroscopy with a single-mode detection scheme
- Zakharov, Pavel Physics Department, Université de Fribourg,Switzerland
- Cardinaux, Frédéric Physics Department, Université de Fribourg,Switzerland
- Scheffold, Frank Physics Department, Université de Fribourg,Switzerland
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2006
Published in:
- Physical Review E. - 2006, vol. 73(1), no. 011413
English
We present a detection scheme for diffusing-wave spectroscopy (DWS) based on a two-cell geometry that allows efficient ensemble averaging. This is achieved by putting a fast rotating diffuser in the optical path between laser and sample. We show that the recorded (multispeckle) correlation echoes provide an ensemble averaged signal that does not require additional time averaging. Furthermore, combined with traditional two-cell DWS, the full intensity autocorrelation function can be measured with a single experimental setup. The scheme provides access to a large range of correlation times thus opening an experimental window for the study of slowly relaxing and arrested systems, such as viscoelastic complex fluids, colloidal glasses, and gels.
- Faculty
- Faculté des sciences
- Department
- Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 5783
- DOI 10.1103/PhysRevE.73.011413
- Persistent URL
- https://folia.unifr.ch/unifr/documents/300017
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