Coded aperture structured illumination digital holographic microscopy for superresolution imaging

This paper proposes a coded aperture structured illumination (CASI) technique in digital holographic microscopy (DHM). A CASI wave is generated using two binary phase codes (0° and 120°) for spatial phase shifting. The generated CASI wave then interferes with a reference wave to form a coded Fresnel...

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Bibliographic Details
Published in:Optics letters 2018-03, Vol.43 (5), p.1143-1146
Main Authors: Lai, Xin-Ji, Tu, Han-Yen, Lin, Yu-Chih, Cheng, Chau-Jern
Format: Article
Language:English
Subjects:
Binary codes
Digital imaging
Illumination
Light
Microscopy
Missing data
Spatial light modulators
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Summary:This paper proposes a coded aperture structured illumination (CASI) technique in digital holographic microscopy (DHM). A CASI wave is generated using two binary phase codes (0° and 120°) for spatial phase shifting. The generated CASI wave then interferes with a reference wave to form a coded Fresnel hologram at a single exposure with compressive sensing (CS) to avoid the temporal phase-shifting process of the structured illumination (SI). The CS algorithm is applied to retrieve the missing data of decoded phase-shifted SI-modulated waves, which are used to separate overlapped spatial frequencies for obtaining a larger spatial frequency coverage to provide superresolution imaging. Two phase-only spatial light modulators are applied to generate a directional SI pattern for obtaining a coded aperture with a suitable size to perform one-shot acquisition in the DHM system.
ISSN:0146-9592
1539-4794
DOI:10.1364/ol.43.001143