We report an approach to enhance the resolution of the microscopy imaging by using the fourier ptychographic microscopy (FPM) method with a laser source and Spatial Light Modulator (SLM) to generate modulated sample illumination. The performance of the existed FPM system is limited by low illumination efficiency of the LED array. In our prototype setup, digital micromirror device (DMD) is introduced to replace the LED array as a reflective spatial light modulator and is placed at the front focal plane of the 4F system. A ring pattern sample illumination is generated by coding the micromirrors on the DMD, and converted to multi-angular illumination through the relay illumination system. A series of intensity sample images can be obtained by changing the size of the ring pattern and then used to reconstruct high resolution image through the ring pattern phase retrieval algorithm. Finally, our method is verified by an experiment using a resolution chart. The results also show that our method have higher reconstruction resolution and faster imaging speed.

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Xiao Tao, Jinlei Zhang, Youquan Liu, Chang Wang, Wentao Zhang, Chenning Tao, Shengqian Chang, and Zhenrong Zheng, "High-resolution DMD-FPM system based on ring pattern phase retrieval algorithm," Proc. SPIE 10752, Applications of Digital Image Processing XLI, 107521K (Presented at SPIE Optical Engineering + Applications: August 22, 2018; Published: 17 September 2018); https://doi.org/10.1117/12.2319648.