Optical phase mining by adjustable spatial differentiator  

作　　者：Tengfeng Zhu Junyi Huang Zhichao Ruan 

机构地区：[1]Zhejiang University,Interdisciplinary Center for Quantum Information,State Key Laboratory of Modern Optical Instrumentation,and Zhejiang Province Key Laboratory of Quantum Technology and Devices,Department of Physics,Hangzhou,China [2]Zhejiang University,College of Optical Science and Engineering,Hangzhou,China

出　　处：《Advanced Photonics》2020年第1期63-69,共7页先进光子学（英文）

基　　金：The authors acknowledge funding through the National Natural Science Foundation of China(NSFC Grants Nos.91850108 and 61675179);the National Key Research and Development Program of China(Grant No.2017YFA0205700);the Open Foundation of the State Key Laboratory of Modern Optical Instrumentation,and the Open Research Program of Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province.Z.R.,T.Z.,and J.H.are named inventors on a number of related patent applications related to this work。

摘　　要：Phase is a fundamental resource for optical imaging but cannot be directly observed with intensity measurements.The existing methods to quantify a phase distribution rely on complex devices and structures and lead to difficulties of optical alignment and adjustment.We experimentally demonstrate a phase mining method based on the so-called adjustable spatial differentiation,by analyzing the polarization of light reflection from a single planar dielectric interface.Introducing an adjustable bias,we create a virtual light source to render the measured images with a shadow-cast effect.From the virtual shadowed images,we can further recover the phase distribution of a transparent object with the accuracy of 0.05λRMS.Without any dependence on wavelength or material dispersion,this method directly stems from the intrinsic properties of light and can be generally extended to a broad frequency range.

关 键 词：adjustable spatial differentiation phase mining REFLECTION POLARIZATION 

分 类 号：O439[机械工程—光学工程] TP391.41[理学—光学]