Enhancement of spatial resolution of ghost imaging via localizing and thresholding  

作　　者：Yunlong Wang Yingnan Zhou Shaoxiong Wang Feiran Wang Ruifeng Liu Hong Gao Pei Zhang Fuli Li 王云龙;周英男;王少雄;王斐然;刘瑞丰;高宏;张沛;李福利(Shaanxi Provincial Key Laboratory for Quantum Information and Quantum Optoelectronic Devices, and Department of Applied Physics,School of Science, Xi'an Jiaotong University)

机构地区：[1]Shaanxi Provincial Key Laboratory for Quantum Information and Quantum Optoelectronic Devices, and Department of Applied Physics,School of Science, Xi'an Jiaotong University

出　　处：《Chinese Physics B》2019年第4期190-195,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11534008,11605126,and 11804271);the Fund from the Ministry of Science and Technology of China(Grant No.2016YFA0301404);the Natural Science Basic Research Plan in Shaanxi Province,China(Grant No.2017JQ1025);the Doctoral Fund of the Ministry of Education of China(Grant Nos.2016M592772 and 2018M631137);the Fundamental Research Funds for the Central Universities

摘　　要：In ghost imaging, an illumination light is split into test and reference beams which pass through two different optical systems respectively and an image is constructed with the second-order correlation between the two light beams. Since both light beams are diffracted when passing through the optical systems, the spatial resolution of ghost imaging is in general lower than that of a corresponding conventional imaging system. When Gaussian-shaped light spots are used to illuminate an object, randomly scanning across the object plane, in the ghost imaging scheme, we show th√at by localizing central positions of the spots of the reference light beam, the resolution can be increased by a factor of 2^(1/2) same as that of the corresponding conventional imaging system. We also find that the resolution can be further enhanced by setting an appropriate threshold to the bucket measurement of ghost imaging.In ghost imaging, an illumination light is split into test and reference beams which pass through two different optical systems respectively and an image is constructed with the second-order correlation between the two light beams. Since both light beams are diffracted when passing through the optical systems, the spatial resolution of ghost imaging is in general lower than that of a corresponding conventional imaging system. When Gaussian-shaped light spots are used to illuminate an object, randomly scanning across the object plane, in the ghost imaging scheme, we show th√at by localizing central positions of the spots of the reference light beam, the resolution can be increased by a factor of 2^(1/2) same as that of the corresponding conventional imaging system. We also find that the resolution can be further enhanced by setting an appropriate threshold to the bucket measurement of ghost imaging.

关 键 词：GHOST imaging localization THRESHOLDING post-selection RESOLUTION ENHANCEMENT 

分 类 号：O4[理学—物理]