基于旋转相位编码与照明光束匹配的叠层衍射成像算法研究

Ptychographical imaging algorithm based on illuminating beam matched with rotational phase encoding

在传统的叠层成像算法中引入一种旋转相位编码与照明光束相匹配.采用分块均匀分布的旋转相位调制器对衍射光进行调制,在探测面获得了相应的衍射图样.这种照明光束与相位匹配的方式有效地增加了解的约束条件,具有收敛速度快、抗噪声及抗位置偏差能力强等优点.与随机相位调制相比,本算法所引入的旋转相位调制器构造简单、使用便捷,因而在实时显微成像、超分辨成像等领域将具有更高的实用价值.

We propose a new ptychographical imaging algorithm based on illuminating beam cooperating with rotational phase encoding. Compared with the traditional ptychographical imaging, the proposed algorithm has a diffractive wave front that is encoded with the uniform phase modulator in a block. It leads to the faster convergent speed for the iterative algorithm of the ptychographical imaging. The illuminating method can present fantastic robustness to resist bad influences brought by the noise and transverse shift of probes. Compared with the random phase modulator, the rotated phase modulator introduced into our algorithm is convenient to be fabricated and located into the real configuration. Therefore, the proposed algorithm has a good value in practical applications such as real-time microscopy and superresolution imaging.