18 December 2012 Rotating point spread function in spiral phase contrast imaging with discrete phase modulation
Author Affiliations +
Proceedings Volume 8697, 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 86970Q (2012) https://doi.org/10.1117/12.2007028
Event: 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2012, Ostravice, Czech Republic
Abstract
Spiral phase contrast imaging is one of the modern methods of optical microscopy applicable to edge contrast enhancement of amplitude and phase samples. The method is based on a spatial spectrum filtering realized by a spiral phase element at the focal plane of the Fourier lens. In this paper, the results of a paraxial wave model of the spiral imaging are presented which allow to calculate the point spread function for real parameters of the spiral filtering and to analyze defocusing effects. A particular attention is given to the analysis of the spiral imaging implemented by a phase mask with a finite number of discrete phase levels. As the main result, a defocusing-induced rotation of the point spread function is discovered and analyzed in detail. Theoretical predictions are verified in experiments using a spatial light modulator for generation of the discrete spiral phase mask.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Baránek, M. Baránek, Z. Bouchal, Z. Bouchal, } "Rotating point spread function in spiral phase contrast imaging with discrete phase modulation", Proc. SPIE 8697, 18th Czech-Polish-Slovak Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 86970Q (18 December 2012); doi: 10.1117/12.2007028; https://doi.org/10.1117/12.2007028
PROCEEDINGS
8 PAGES


SHARE
Back to Top