Multi-speckle diffusing wave spectroscopy with a single mode detection scheme

Details Multi-speckle diffusing wave spectroscopy with a single mode detection scheme Multi-speckle diffusing wave spectroscopy with a single mode detection scheme

2005-09-26

arxiv.org/abs/cond-mat/0509637v2

Physics

Condensed Matter

Soft Condensed Matter

Submitted to PRE

Scientific paper

10.1103/PhysRevE.73.011413

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 (multi-speckle) correlation echoes provide an ensemble averaged signal that does not require additional time averaging. We find the performance of our experimental scheme comparable or even superior to camera based multi-speckle techniques that rely on direct spatial averaging. Furthermore, combined with traditional two-cell DWS, the full intensity autocorrelation function can be measured with a single experimental setup covering more than 10 decades in correlation time.

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