Effect of partial coherent illumination on Fourier ptychography

Alexander Heemels; Temitope Agbana; Silvania Pereira; Jan Carel Diehl; Michel Verhaegen; Gleb Vdovin

doi:10.1117/12.2544766

20 February 2020 Effect of partial coherent illumination on Fourier ptychography

Alexander Heemels, Temitope Agbana, Silvania Pereira, Jan Carel Diehl, Michel Verhaegen, Gleb Vdovin

Proceedings Volume 11251, Label-free Biomedical Imaging and Sensing (LBIS) 2020; 112511K (2020) https://doi.org/10.1117/12.2544766
Event: SPIE BiOS, 2020, San Francisco, California, United States

Abstract

Fourier Ptychography is a computational imaging technique able to decouple high resolution from wide field of view, bypassing the diffraction limit of the microscope. Since it does not rely on high precision mechanics or fluorescent imaging, it is of practical interest for implementation in low scale devices. Despite its gains, realizing a functional low-cost setup working at the theoretical limits is challenging due to many factors causing discrepancies between theory and practice. Misalignment of the light emitting diode array (LED-array), optical system aberrations and use of partial coherent sources are common issues which have been addressed with calibration algorithms. However, physical interpretation of how these factors influence the algorithm and cause mismatches between theory and practice has had little attention so far. This work provides a discussion based on simulation results on the effect of the partial coherence of the source. From obtained results, an optimal set of LEDs for data acquisition is described which avoids degeneracy caused by partial coherence and is based on the numerical aperture (NA) of the objective and source parameters such as bandwidth and size.

Citation Download Citation

Alexander Heemels, Temitope Agbana, Silvania Pereira, Jan Carel Diehl, Michel Verhaegen, and Gleb Vdovin "Effect of partial coherent illumination on Fourier ptychography", Proc. SPIE 11251, Label-free Biomedical Imaging and Sensing (LBIS) 2020, 112511K (20 February 2020); https://doi.org/10.1117/12.2544766

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KEYWORDS

Light emitting diodes

Imaging systems

Objectives

Image acquisition

Algorithm development

Composites

Light

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