Image windowing mitigates edge effects in Differential Dynamic Microscopy

  • Fabio Giavazzi
  • Paolo Edera
  • Peter J. Lu
  • Roberto Cerbino
Tips and Tricks

Abstract.

Differential Dynamic Microscopy (DDM) analyzes traditional real-space microscope images to extract information on sample dynamics in a way akin to light scattering, by decomposing each image in a sequence into Fourier modes, and evaluating their time correlation properties. DDM has been applied in a number of soft-matter and colloidal systems. However, objects observed to move out of the microscope’s captured field of view, intersecting the edges of the acquired images, can introduce spurious but significant errors in the subsequent analysis. Here we show that application of a spatial windowing filter to images in a sequence before they enter the standard DDM analysis can reduce these artifacts substantially. Moreover, windowing can increase significantly the accessible range of wave vectors probed by DDM, and may further yield unexpected information, such as the size polydispersity of a colloidal suspension.

Graphical abstract

Keywords

Tips and Tricks 

Supplementary material

10189_2017_11587_MOESM1_ESM.avi (959 kb)
Supplementary material

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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Fabio Giavazzi
    • 1
  • Paolo Edera
    • 1
  • Peter J. Lu
    • 2
  • Roberto Cerbino
    • 1
  1. 1.Dipartimento di Biotecnologie Mediche e Medicina TraslazionaleUniversità degli Studi di MilanoSegrateItaly
  2. 2.Department of Physics and SEASHarvard UniversityCambridgeUSA

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