Complex transmission matrix retrieval for a highly scattering medium via regional phase differentiation  

作　　者：QIAOZHI HE RONGJUN SHAO YUAN Qu LINXIAN LIU CHUNXU DING JIAMIAO YANG 

机构地区：[1]School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]Institute of Marine Equipment,Shanghai Jiao Tong University,Shanghai 200240,China [3]School of Automation and Software Engineering,Shanxi University,Taiyuan 030006,China

出　　处：《Photonics Research》2024年第5期876-883,共8页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(62305208,62375171);Shanghai Pujiang Program(22PJ1407500);Shanghai Jiao Tong University 2030 Initiative(WH510363001-10);Oceanic Interdisciplinary Program of Shanghai Jiao Tong University(SL2022ZD205);Science Foundation of Donghai Laboratory(DH-2022KF01001)。

摘　　要：Accurately measuring the complex transmission matrix(CTM) of the scattering medium(SM) holds critical significance for applications in anti-scattering optical imaging, phototherapy, and optical neural networks. Noninterferometric approaches, utilizing phase retrieval algorithms, can robustly extract the CTM from the speckle patterns formed by multiple probing fields traversing the SM. However, in cases where an amplitude-type spatial light modulator is employed for probing field modulation, the absence of phase control frequently results in the convergence towards a local optimum, undermining the measurement accuracy. Here, we propose a high-accuracy CTM retrieval(CTMR) approach based on regional phase differentiation(RPD). It incorporates a sequence of additional phase masks into the probing fields, imposing a priori constraints on the phase retrieval algorithms. By distinguishing the variance of speckle patterns produced by different phase masks, the RPD-CTMR can effectively direct the algorithm towards a solution that closely approximates the CTM of the SM. We built a prototype of a digital micromirror device modulated RPD-CTMR. By accurately measuring the CTM of diffusers, we achieved an enhancement in the peak-to-background ratio of anti-scattering focusing by a factor of 3.6, alongside a reduction in the bit error rate of anti-scattering image transmission by a factor of 24. Our proposed approach aims to facilitate precise modulation of scattered optical fields, thereby fostering advancements in diverse fields including high-resolution microscopy, biomedical optical imaging, and optical communications.

关 键 词：MATRIX PHASE holds 

分 类 号：O43[机械工程—光学工程]