Open AccessAxial resolution analysis in compressive digital holographic microscopy
Author(s) -
Ping Su,
Dimin Sun,
Jianshe Ma,
Zhenpeng Luo,
Hua Zhang,
Shilun Feng,
Liangcai Cao
Publication year - 2021
Publication title -
optics express
Language(s) - Slovenian
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.411142
Subject(s) - optics , microscale chemistry , optical coherence tomography , numerical aperture , holography , resolution (logic) , digital holography , digital holographic microscopy , paraxial approximation , microscopy , tomography , materials science , physics , wavelength , computer science , mathematics , beam (structure) , mathematics education , artificial intelligence
Digital holographic microscopy with compressive sensing (CDHM) has successfully achieved tomography and has been applied in many fields. However, the enhancement of axial resolution in CDHM remains to be elucidated. By deducing accurate formulas for the lateral and axial resolutions without paraxial approximation, we quantized the elongation effect of a digital holography (DH) system in this study. Thus, we revealed that the elongation effect, which is affected only by the system's numerical aperture (NA), is an inherent property of DH systems. We present a detailed analysis herein on the physical significance of the coherence parameter, which is the ratio of a system's limit axial resolution to the interlayer spacing more thoroughly than in previous research. Further, we achieved the tomography of a fiber by using a DH system with a 10 × microscope, with CS to eliminate the elongation effect, and experimentally validated our theoretical results. By applying these theoretical guidelines, we distinguished crossed fibers at distances of 36.4 μm and 48.5 μm, respectively, using the same experimental setup. There would be potential applications of this theory in tomography and observation of microscale objects in the areas of biological and fluid.