Paul Montgomery is a senior research scientist with the CNRS at the Engineering science, computer science and imaging laboratory (ICube) in Strasbourg, France. He has over 30 years' experience in developing optical instrumentation for the characterization of materials and biomaterials. He is currently interested in label-free far field nanoscopy, microsphere-assisted interference microscopy, local spectroscopy and the use of environmental chambers for measuring specific parameters. He is a senior member and a member of the Board of Directors of SPIE as well as being a member of IOP and SFO.
Interference microscopy is a non-destructive full-field imaging method, mainly used to measure the surface topography of different samples. In this work, two designs for improving the signal quality are described. The first consists of an original vertically orientated breadboard interferometer, in a Linnik configuration. The mechanical design of the arms allows the independent control and alignment of the coherence and the focal plane positions for optimizing fringe contrast. A low noise 16-bit camera is used to improve the sensitivity. The second interferometer is based on a Thorlabs tube system, with a Nikon Mirau Objective and a white LED, all controlled with IGOR Pro software or Labview, with the aim of being more compact, flexible and mobile. For both systems, an evaluation of the interferometric signal quality is performed, whereas the difference in lateral resolution by considering the 3D nature of the interferometric system, or only its 2D imaging abilities, is explored.
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