Grating-free autofocus for single-pixel microscopic imaging  

作　　者：GUAN WANG HUAXIA DENG YU CAI MENGCHAO MA XIANG ZHONG XINGLONG GONG 

机构地区：[1]CAS Key Laboratory of Mechanical Behavior and Design of Materials,Department of Modern Mechanics,University of Science and Technology of China,Hefei 230027,China [2]School of Instrument Science and Opto-electronics Engineering,Hefei University of Technology,Hefei 230009,China

出　　处：《Photonics Research》2024年第6期1313-1321,共9页光子学研究（英文版）

基　　金：CAS Talent Introduction Program(437KJ2090007006);Fundamental Research Funds for the Central Universities(WK2480000010);Natural Science Foundation of Anhui Province(1908085J15,2208085ME138);National Natural Science Foundation of China(11872167,52275529).

摘　　要：As a computational technology,single-pixel microscopic imaging(SPMI)transfers the target’s spatial information into a temporal dimension.The traditional focusing method of imaging before evaluation is not applicable to the SPMI system.We propose a grating-free autofocus strategy derived from the physical mechanism of optical defocus.Maximizing the amplitude information of just one high-frequency point in the spectrum is all that is needed to achieve fast autofocus with the SPMI system.Accordingly,only four patterns need to be cyclically projected,enabling efficient localization of the focal plane based on the measurement data.We demonstrate SPMI autofocus experiments at micrometer and even nanometer depths of field.The proposed method can be extended to achieve SMPI autofocus with invisible optical pattern illumination.

关 键 词：optical system ILLUMINATION 

分 类 号：O439[机械工程—光学工程] TP391.41[理学—光学]