title: High Speed Computational Ghost Imaging via Spatial Sweeping.
abstract: Computational ghost imaging (CGI) achieves single-pixel imaging by using a Spatial Light Modulator (SLM) to generate structured illuminations for spatially resolved information encoding. The imaging speed of CGI is limited by the modulation frequency of available SLMs, and sets back its practical applications. This paper proposes to bypass this limitation by trading off SLM's redundant spatial resolution for multiplication of the modulation frequency. Specifically, a pair of galvanic mirrors sweeping across the high resolution SLM multiply the modulation frequency within the spatial resolution gap between SLM and the final reconstruction. A proof-of-principle setup with two middle end galvanic mirrors achieves ghost imaging as fast as 42 Hz at 80 × 80-pixel resolution, 5 times faster than state-of-the-arts, and holds potential for one magnitude further multiplication by hardware upgrading. Our approach brings a significant improvement in the imaging speed of ghost imaging and pushes ghost imaging towards practical applications.
authors.affiliation: Department of Automation, Tsinghua University, Beijing, 100084, China.
authors.forename: Yuwang
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Automation, Tsinghua University, Beijing, 100084, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Automation, Tsinghua University, Beijing, 100084, China.
authors.forename: Jinli
authors.initials: J
authors.lastname: Suo
authors.affiliation: Shanghai Institute of Optics and Fine Mechanics, Shanghai, 201800, China.
authors.forename: Guohai
authors.initials: G
authors.lastname: Situ
authors.affiliation: Department of Automation, Tsinghua University, Beijing, 100084, China.
authors.forename: Chang
authors.initials: C
authors.lastname: Qiao
authors.affiliation: Department of Automation, Tsinghua University, Beijing, 100084, China.
authors.forename: Qionghai
authors.initials: Q
authors.lastname: Dai