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Size metrology of a pure phase object based on the laser probe beam reshaping

Abstract : We propose a simple method for determining the size of a transparent object based on the reshaping of a laser probe beam which is initially Gaussian in shape. For a given ratio between the sizes of the incident beam and of the phase object, the diffracted laser probe beam is transformed in the far-field region into a hollow beam. The detection of the intensity dip in the beam centre is made with a simple photodiode. The potential of the proposed technique for quantifying the nanoscale change of the phase object could be very useful to study the dynamics of a living cell membrane for instance.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-02112748
Contributor : Marc Brunel <>
Submitted on : Friday, April 26, 2019 - 10:00:44 PM
Last modification on : Tuesday, April 21, 2020 - 11:40:12 AM

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Michael Fromager, Marc Brunel, Kamel Aït-Ameur. Size metrology of a pure phase object based on the laser probe beam reshaping. Optics and Lasers in Engineering, Elsevier, 2014, 54, pp.88-92. ⟨10.1016/j.optlaseng.2013.10.008⟩. ⟨hal-02112748⟩

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