Single-pixel coherent diffractive imaging based on super-pixel holography

Abstract

Quantitative phase imaging (QPI) is a powerful approach to study dynamics associated with both thickness and refractive index fluctuations. In this work, we propose a coherent diffractive QPI scheme based on single-pixel imaging structure and coherent modulation imaging. In this scheme, digital micro-mirror device with high refresh rate is employed for structured illumination. Synchronously, a single point detector is used to perform mode selected measurement of diffraction intensity. Based on the illumination structure and point signals, phase imaging is realized using a reweighted amplitude flow phase retrieval algorithm. Non-interference modality omits the reference arm, which simplifies the apparatus and improves the system robustness. This proposed technique is demonstrated by QPI of both digital binary and grayscale objects. The three-dimensional profile measurement of a plano-convex lens shows the possibility of phase retrieval for real objects. Accordingly our technique will promote the application of single-pixel phase imaging to biomedical imaging, x-ray diffraction imaging and three-dimensional profilometry.