Monika Ritsch-Marte, Professeur à l’Université Médicale d’Innsbruck (Autriche) et spécialiste mondiale de manipulation de front d’onde pour la microscopie donnera
un séminaire intitulé "New Tricks in Optical Microscopy by Wavefront Shaping with Spatial Light Modulators" le 29/01/2013.
Abstract :
Liquid-crystal based spatial light modulators (SLMs) are valuable tools in
optical microscopy. They can for instance act as a programmable Fourier
filter, emulating contrast mechanisms, such as bright field, dark field, or
(spiral) phase contrast [1]. Differential interference contrast (DIC), which
uses incoherent light, may also be implemented by SLMs, introducing the full
flexibility of the “synthetic holography”, where the Wollaston prisms are
replaced by diffractive structures displayed on the SLM. This allows one to
optimize the SLM pattern as to deliver several images with different
settings (e.g. shearing) in one single exposure for “single-shot
quantitative DIC”. SLM-based holographic multiplexing may also be applied to
target different layers inside a thick transparent sample in
“depth-of-field-multiplexing”. Moreover, SLMs can also be used to control or
shape the illumination beams in linear and nonlinear optical microscopy.
Applying wavefront control twice it is even possible to play special tricks
with matching illumination shaping and phase filtering, which may be
utilized, for instance, to suppress halos in Zernike phase contrast.
[1] C. Maurer, A. Jesacher, S. Bernet, and M. Ritsch-Marte : „SLM-Microscopy :
What spatial light modulators can do for microscopy“, Lasers and Photonics
Reviews, 5, 81-101 (2011)
Invitation : Hervé Rigneault (MOSAIC) herve.rigneault@fresnel.fr
Contact chercheur :
Monika Ritsch-Marte
Division for Biomedical Physics, Innsbruck Medical University,
Austria
ResearchGate
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