Programmable Microscopy
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Our spatial light modulators (SLMs) are high-resolution liquid crystal panels with micron-sized individually addressable pixels, which can be used to shape the wavefront of an optical beam. Grey-level values on the panel are converted into phase shifts. We use SLMs for instance as programmable Fourier filters for generating contrast enhancement or as programmable diffractive optical elements for quantitative phase microscopy: Some recent achievements are the demonstration of spiral phase contrast, giving rise to strong isotropic edge-enhancement in the images, SLM-based depth-of-field multiplexing or quantitative single-shot-DIC imaging and more (see Topics below). |
Presentation at the Exner Ceremony 2016
Projects
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RESCH microscopy |
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SLM-aided multiplexing |
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Spiral phase contrast (SPC) |
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Speckle-aided holography |
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Dynamic Fourier-filtering |
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Speeding up SLMs with overdrive |
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Aberration correction and artifact reduction |
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Generation and tailoring of complex fields |
We also use SLMs to shape and a steer optical traps (cf. optical tweezers) and to fine-tune the phase matching in wide-field CARS microscopy
Collaborations
- with Miles Padgett (university of Glasgow) on Spiral Phase Contrast in Ghost Imaging:
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B. Jack, J. Leach, J. Romero, S. Franke-Arnold, M. Ritsch-Marte, S. M. Barnett, and M. J. Padgett: Holographic ghost imaging and the violation of a Bell inequality, Phys. Rev. Lett. 103, 083602 (2009)
- member/partner of the CDL-Mach Lab chaired by David Stifter at the University of Linz, joint paper on Spiral Phase Contrast in OCT:
S.E. Schausberger, B. Heise, C. Maurer, S. Bernet, M. Ritsch-Marte, and D. Stifter: Flexible contrast for low-coherence interference microscopy by Fourier-plane filtering with a spatial light modulator, Optics Letters 24, 4154-4156 (2010)
- local collaboration with the Central Institute for Blood Transfusion and Immunology on platelet activation:
S. Khan, A. Jesacher, W. Nussbaumer, S. Bernet, and M. Ritsch-Marte: Quantitative analysis of shape and volume changes in activated thrombocytes in real time by single-shot SLM-based DIC imaging, Journal of Biophotonics 4, 600-609 (2011)
- Collaboration with the University of Queensland, Australia (Halina Rubinsztein-Dunlop and Tim McIntyre) on optical tweezers and SLM-based imaging
T.C. McIntyre, C. Maurer, S. Bernet, and M. Ritsch-Marte: Differential interference contrast imaging using a spatial light modulator, Opt. Lett. 34, 2988-2990 (2009)