News and events - Tampere University of Technology

Ultra-small, ultra-fast, ultra-precise - new optical measurement techniques show great promise

The ability to image objects with high precision is central to our everyday life and understanding fundamental phenomena. In his dissertation, Piotr Ryczkowski demonstrates several advanced light-based measurement techniques for imaging objects with great precision.

Over the past decades, there have been intense research efforts to develop techniques capable of producing images with ever smaller details and at ever faster speeds. In his dissertation, Piotr Ryczkowski demonstrates several novel light-based measurement techniques that enable achieving high precision when imaging objects with ultra-small dimensions or ones moving at ultrafast speeds. With these new methods, not only physical objects can be captured but also information in the form of time-varying waveforms.

“My research verifies that controlling light properties is crucial for developing techniques capable of imaging objects with improved precision and/or high speed. In addition, I was able to demonstrate that high-resolution images can be obtained with light beams that do not necessarily carry detailed information about the object. This has many potential applications in industrial quality control, biology, or communications, for example,” Ryczkowski explains.

Ryczkowski’s research features three main contributions. First, the development of a novel broadband light source producing short periodic pulses of light in the visible region and with arbitrarily tunable repetition. This allows for the capture of the 3D movement of micrometre-scale electro-mechanical transducers with a precision better than 1 billionth of a meter. Secondly, Ryczkowski carried through the proof-of-concept demonstration of a new type of tomographic imaging that uses the intensity correlation between two different beams to reconstruct the image of an object with more points that with conventional approaches and with built-in image distortion compensation. Thirdly, he introduces a novel method for detecting ultrafast pulses that carry information over durations shorter than one billionth of a second without actually ‘seeing’ those pulses directly, and even when the information has been completely scrambled.

Public defence of a doctoral dissertation on Wednesday, 28 September

MSc Piotr Ryczkowski’s doctoral dissertation in the field of natural science and engineering entitled ‘Novel Interferometric and Correlation Optical Imaging Techniques’ will be publicly examined at the Faculty of Natural Sciences of Tampere University of Technology (TUT) in room K1702 in the Konetalo building (address: Korkeakoulunkatu 6, Tampere, Finland) at 12 noon on Wednesday, 28 September 2016.

The opponent will be Professor Kenneth K.Y. Wong (The University of Hong Kong). Professor Goëry Genty from the Optics Laboratory at TUT will act as Chairman. 

Piotr Ryczkowski (31) comes from Toruń, Poland, and works as a researcher at the Optics Laboratory of TUT.

Further information:

Piotr Ryczkowski, tel. +358 40 198 1175,

The dissertation is available online at:

News submitted by: Tiina Leivo
News updated by: Sanna Kähkönen
Keywords: science and research, light-based measurement techniques, object imaging