AUTHOR=Zheng Juanjuan , Guo Xuhong , Ma Ying , Wen Kai , An Sha , Wang Xiaofang , Gao Peng , Qian Jiaming , Zuo Chao , Gao Peng TITLE=Structured illumination lensless digital holographic microscopy (SI-LDHM) JOURNAL=Frontiers in Physics VOLUME=12 YEAR=2024 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2024.1485687 DOI=10.3389/fphy.2024.1485687 ISSN=2296-424X ABSTRACT=
In this work, we propose a structured-illumination lensless digital holographic microscopy (SI-LDHM). SI-LDHM illuminates a sample with 24 structured illuminations (8 orientations × 3 phase shifts) and records the defocused interferogram formed by two copies of object waves along the ±1 st diffraction orders of each SI. The reconstructed object waves under different illumination orientations are respectively propagated to the sample plane along the +1 st diffraction order and then averaged, thus yielding a clean image without the artifact of twin images. Experimental results demonstrated that thanks to the multi-oriented SI strategy, the twin image in SI-LDHM is sevenfold reduced compared to conventional DHM, while the spatial resolution is 1.15 times higher.