Single-shot phase retrieval based on anisotropic metasurface

Abstract

Phase retrieval is a generic calculating phase method through intensity images and prior conditions. Usually, the image recording system requires stable mechanical movement and accurate alignment between different phase-shift images, which greatly limits the imaging speed and stability, resulting in mismatch or low phase retrieval quality. In this work, we propose a single-shot polarization-sensitive phase retrieval developed from triple transport of the intensity method with anisotropic metasurface. By applying gradient phase along the interface, three images with diffractive phase differences are projected on the recording plane. The three images are formed with known diffraction distances due to the conjugate Pancharatnam−Berry phase modulation of metasurface. The recorded images are calculated and post-processed using transport of intensity equation technique to obtain the phase of object. As a proof-of-principle, we demonstrate the phase imaging results through measuring phase-only objects with single-shot capture. Compared to traditional transport-of-intensity equation optical systems, our method requires no mechanical or system tuning, and polarization or electric controller switching. Thus, it can acquire three differently focused images with single-shot. This significantly improves the time efficiency of the experiments. Such compact metadevice with simplified manipulation and easy post-processing for phase retrieval can be applied to various applications, such as optical microscopy, fluid measurement, and on-ship integration.

Recent Advances and Prospects of Optical Metasurfaces

“…As shown in Figure 5f, the metasurfaces were placed on the Fourier plane of the 4f systems, contributing to different beam deflections and axial translations in the orthogonal polarization channels. 139 The images encoded by the axial distance can then be simultaneously captured.…”

“…(f) Compact single-shot optical recording system based on TIE method. Reprinted with permission from ref . Copyright 2022 AIP Publishing.…”

“…After quantitative calculation, the phase gradient images with resolutions of 92.3 mradμm –1 are demonstrated. Besides, compact single-shot optical recording systems based on the transport-of-intensity equation (TIE) method were proposed, , which recover phase information based on the axial intensity derivative. As shown in Figure f, the metasurfaces were placed on the Fourier plane of the 4f systems, contributing to different beam deflections and axial translations in the orthogonal polarization channels .…”

Dielectric Metasurface Enabled Compact, Single-Shot Digital Holography for Quantitative Phase Imaging

“…It has been acknowledged as a suitable platform for use in high-performance miniature microscopes and imaging systems, including use of flat optic devices such as metalenses in biosensing, lasing, beam steering, quantum light generation, and optical information processing . In recent years, there have been several demonstrations of miniature QPI systems using metasurfaces such as quantitative phase gradient imaging using a system of multifunctional metasurfaces, phase contrast imaging, isotropic DIC microscopy, and noninterferometric quantitative phase imaging. , For high-precision quantitative phase measurements and the evaluation of the fundamental properties of the test sample, interferometric methods must be employed.…”

“…44 In recent years, there have been several demonstrations of miniature QPI systems using metasurfaces such as quantitative phase gradient imaging using a system of multifunctional metasurfaces, 45 phase contrast imaging, 46 isotropic DIC microscopy, 47 and noninterferometric quantitative phase imaging. 48,49 For highprecision quantitative phase measurements and the evaluation of the fundamental properties of the test sample, interferometric methods must be employed.…”