In coherent diffractive imaging (CDI) experiments, a beamstop (BS) is commonly used to extend the exposure time of the charge-coupled detector and obtain high-angle diffraction signals. However, the negative effect of a large BS is also evident, causing low-frequency signals to be missed and making CDI reconstruction unstable or causing it to fail. We performed a systematic simulation investigation of the effects of BSs on the quality of reconstructed images from both plane-wave and ptychographic CDI (PCDI). For the same imaging quality, we found that ptychography can tolerate BSs that are at least 20 times larger than those for plane-wave CDI. For PCDI, a larger overlap ratio and a smaller illumination spot can significantly increase the imaging robustness to the negative influence of BSs. Our results provide guidelines for the usage of BSs in CDI, especially in PCDI experiments, which can help to further improve the spatial resolution of PCDI.
© 2013 Optical Society of America
Original Manuscript: December 20, 2012
Manuscript Accepted: February 28, 2013
Published: April 10, 2013
Vol. 8, Iss. 5 Virtual Journal for Biomedical Optics
Haigang Liu, Zijian Xu, Xiangzhi Zhang, Yanqing Wu, Zhi Guo, and Renzhong Tai, "Effects of missing low-frequency information on ptychographic and plane-wave coherent diffraction imaging," Appl. Opt. 52, 2416-2427 (2013)