Lock-in incoherent differential phase contrast imaging  

作　　者：CHIARA BONATI DAMIEN LOTERIE TIMOTHé LAFOREST CHRISTOPHE MOSER 

机构地区：[1]Laboratory of Applied Photonics Devices,School of Engineering,Ecole Polytechnique Fédérale de Lausanne,1015 Lausanne,Switzerland

出　　处：《Photonics Research》2022年第1期237-247,共11页光子学研究（英文版）

摘　　要：We introduce a lock-in method to increase the phase contrast in incoherent differential phase contrast(DPC)imaging.This method improves the phase sensitivity by the analog removal of the background.The use of a smart pixel detector with in-pixel signal demodulation,paired with synchronized switching illumination,provides the basis of a bit-efficient approach to emulate a lock-in DPC.The experiments show an increased sensitivity by a factor of up to 8,as expected from theory,and a reduction of collected data by a factor of 70,for equivalent standard DPC measurements;single-shot sensitivity of 0.7 mrad at a frame rate of 1400 frames per second is demonstrated.This new approach may open the way for the use of incoherent phase microscopy in biological applications where extreme phase sensitivity and millisecond response time are required.

关 键 词：PHASE ILLUMINATION DIFFERENTIAL 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]