Rotating point spread function in spiral phase contrast imaging with discrete phase modulation

M. Baránek; Z. Bouchal

doi:10.1117/12.2007028

18 December 2012 Rotating point spread function in spiral phase contrast imaging with discrete phase modulation

M. Baránek, Z. Bouchal

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.

Citation Download Citation

M. Baránek and 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); https://doi.org/10.1117/12.2007028

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KEYWORDS

Point spread functions

Phase shift keying

Phase contrast

Phase modulation

Spatial light modulators

Modulation

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