中国物理B ›› 2019, Vol. 28 ›› Issue (4): 44202-044202.doi: 10.1088/1674-1056/28/4/044202

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Enhancement of spatial resolution of ghost imaging via localizing and thresholding

Yunlong Wang(王云龙), Yingnan Zhou(周英男), Shaoxiong Wang(王少雄), Feiran Wang(王斐然), Ruifeng Liu(刘瑞丰), Hong Gao(高宏), Pei Zhang(张沛), Fuli Li(李福利)   

  1. Shaanxi Provincial Key Laboratory for Quantum Information and Quantum Optoelectronic Devices, and Department of Applied Physics, School of Science, Xi'an Jiaotong University, Xi'an 710049, China
  • 收稿日期:2018-11-07 修回日期:2018-12-30 出版日期:2019-04-05 发布日期:2019-04-05
  • 通讯作者: Ruifeng Liu, Fuli Li E-mail:ruifeng.liu@mail.xjtu.edu.cn;flli@mail.xjtu.edu.cn
  • 基金资助:

    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), and the Fundamental Research Funds for the Central Universities.

Enhancement of spatial resolution of ghost imaging via localizing and thresholding

Yunlong Wang(王云龙), Yingnan Zhou(周英男), Shaoxiong Wang(王少雄), Feiran Wang(王斐然), Ruifeng Liu(刘瑞丰), Hong Gao(高宏), Pei Zhang(张沛), Fuli Li(李福利)   

  1. Shaanxi Provincial Key Laboratory for Quantum Information and Quantum Optoelectronic Devices, and Department of Applied Physics, School of Science, Xi'an Jiaotong University, Xi'an 710049, China
  • Received:2018-11-07 Revised:2018-12-30 Online:2019-04-05 Published:2019-04-05
  • Contact: Ruifeng Liu, Fuli Li E-mail:ruifeng.liu@mail.xjtu.edu.cn;flli@mail.xjtu.edu.cn
  • Supported by:

    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), and 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 that by localizing central positions of the spots of the reference light beam, the resolution can be increased by a factor of √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

Abstract:

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 that by localizing central positions of the spots of the reference light beam, the resolution can be increased by a factor of √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.

Key words: ghost imaging, localization, thresholding, post-selection, resolution enhancement

中图分类号:  (Imaging and optical processing)

  • 42.30.-d
42.40.Lx (Diffraction efficiency, resolution, and other hologram characteristics) 87.63.lm (Image enhancement) 87.57.cf (Spatial resolution)