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Proceedings Paper

High resolution digital holography based on the point source scanning
Author(s): Minchao Wang; Dayong Wang; Lu Rong; Yunxin Wang; Fengpeng Wang; Qiaowen Lin
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Paper Abstract

Digital holographic microscopy has been widely used for the imaging of micro-objects and biological samples. Lensless in-line digital holographic microscopy is capable of wide field-of-view imaging. However the spatial resolution of the reconstructed images is limited by the pixel size of the detector. The relative position shift between the sample and the detector can effectively improve the resolution in the traditional sub-pixel shifting method, but it requires a high precision of translation stage. To overcome this problem, we propose a method based on the point source scanning to realize sub-pixel shifting. High precision sub-pixel shifting is achieved easily by using the geometric between point source and detector. Through moving the point source, multiple holograms with sub-pixel shifts are captured. These holograms are merged together to obtained a high resolution hologram by a synthesizing algorithm. Then, the high resolution reconstructed image of the object can be obtained by the angular spectrum algorithm. The feasibility of the proposed method is demonstrated by simulation and experiments. A USAF resolution test target was used as the object. Compared with the traditional digital holography, a higher resolution reconstructed image is obtained by our method. The proposed method has the advantages of simple recording setup and lower precision requirement of the translation stage. It can achieve the wide field-of-view and high resolution imaging.

Paper Details

Date Published: 31 October 2016
PDF: 8 pages
Proc. SPIE 10022, Holography, Diffractive Optics, and Applications VII, 100221R (31 October 2016); doi: 10.1117/12.2245428
Show Author Affiliations
Minchao Wang, Beijing Univ. of Technology (China)
Dayong Wang, Beijing Univ. of Technology (China)
Lu Rong, Beijing Univ. of Technology (China)
Yunxin Wang, Beijing Univ. of Technology (China)
Fengpeng Wang, Beijing Univ. of Technology (China)
Qiaowen Lin, Beijing Univ. of Technology (China)

Published in SPIE Proceedings Vol. 10022:
Holography, Diffractive Optics, and Applications VII
Yunlong Sheng; Chongxiu Yu; Changhe Zhou, Editor(s)

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