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Bachelor/Master Projects

Multilens array for multifocus imaging

(Master/Physics, supervising: Prof. Rainer Heintzmann, Dr. Christian Karras)
Through a former project, we developed a Zemax design for a special multilens array. The function of the multilens array is to focus the separated orders of a multifocus microscope on different zones of a detector. The student will have to find a way (possibly thanks to collaborations with other groups or institutes) to manufacture the multilens array, then to test its performance. Another part of the project is to perform the acquisition of multifocus images.

New sample embedding media:

(Bachelor or Master/Chemistry, supervising: Martin Reifarth)
Martin Reifarth synthesized a novel medium with an exceptionally high refractive index. Unfortunately this turned out to not be water soluble. Such a water-soluble medium of high-n and low osmolarity would be a fantastic embedding medium for all types of light-microscopy. The aim of this project is to synthesize such a medium.

Clarity protocol with non-toxic substances

(Bachelor or Master/Chemistry, supervising: Dr. Ulrich Leischner)
The aim is to combine the existing clarity sample embedding procedure with new substances.

New embedding media for Raman microscopy for medical diagnostics

(Master Chemistry, supervising: Dr. Ulrich Leischner, Walter Müller)
Some ideas will be tried using different substances that are promising to yield a low Raman intensity. This should be tried out and residual Raman signal will be hopefully eliminated with the help of image processing.

CARS/SARS theory

(Master Physics, supervising: Prof. Rainer Heintzmann)
Coherent antistokes Raman and stimulated Raman scattering is an effect that is often used for imaging. However, no unified theory yet exists. We have some ideas about how such a theory could be made. The candidate would get familiar with the matter and try to expand on the ideas with the aim to develop a unified theory about CARS imaging that is easy to describe in pictures.

Inverse modelling for Holography

(Master Physics, supervising : Prof. Rainer Heintzmann, Marie Walde)
Inverse modelling with the help of an existing Matlab toolbox will be applied to simulated and measured data from multi-wavelength holography/holoscopy. This can allow to image large volumes relatively quickly, which can have a medical impact in fields like ophthalmology.

Optical design of light-sheet illumination optics for a range of imaging conditions
(Bachelor or Master Physics, supervising: Dr. Ulrich Leischner)
The aim is to (individually) optimize the optical performance of the light-sheet microscopy illumination system present in the lab for new types of samples, new illumination wavelengths, different index of refraction and larger field of view.

Blind PSF deconvolution of light-sheet data

(Master Physics, supervising: Prof. Rainer Heintzmann)
A deconvolution framework has been programmed in the Heintzmann lab. The most recent addition is the ability to deconvolve data with an unknown point spread function, by estimating its unknown complex valued amplitude in the aperture plane. The aim here is to expand this scheme to the deconvolution of light-sheet data, where the point spread function is often distorted to an unknown degree. In a second step, one can also try to incorporate ideas about spatial variations in the point spread function.

Deconvolution framework in the programming language Julia

(Master Physics/(Computer Science/Informatics), supervising: Dr. Martin Kielhorn, Prof. Rainer Heintzmann)
In recent year a new (functional) programming language has evolved named Julia. It is very fast, versatile (similar to Matlab), easy to use and free. Therefore the aim is to program the ideas contained in an existing deconvolution framework in Julia and optimize and test it. For further speed improvements, this can also be combined with the ability of exploiting the Cuda framework with the help of CudaMat. Mutable arrays, which are not possible in Matlab can also be exploited to this aim

High speed Raman-microscopy

(Master Physics, supervising: Walter Müller)
Raman microscopy is a chemical contrast imagingmethod without complicated staining. Currently, Raman microscopy is limited by the speed of the LASER spot scanning over a certain field of view. For biological samples, the measurement of one spot takes over 100ms and hence, even for a small image of 100×100 pixels, one would need apx. 20 minutes. The aim of this thesis would be to speed this method up to a few seconds.

If you are enrolled in the FSU and are interested in any of the above projects, or have your own research ideas, please contact the appropriate supervisor and Rainer Heintzmann for more details and discussion.

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