Single-pixel identification of 2-dimensional objects by using complex Laguerre-Gaussian spectrum containing both azimuthal and radial modal indices

OPTICS COMMUNICATIONS

卷:481

Article

Du, Jing^1,2,3  Zhang, Runzhou¹  Zhao, Zhe¹  Xie, Guodong¹  Li, Long¹  Song, Haoqian¹  Pang, Kai¹  Liu, Cong¹  Song, Hao¹  Almaiman, Ahmed^1,4  Lynn, Brittany⁵  Tur, Moshe⁶  Willner, Alan E.¹ 

[1] Univ Southern Calif, Dept Elect Engn, Los Angeles, CA 90089 USA

[2] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Hubei, Peoples R China

[3] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Hubei, Peoples R China

[4] King Saud Univ, Riyadh 11362, Saudi Arabia

[5] Naval Informat Warfare Ctr, San Diego, CA 92152 USA

[6] Tel Aviv Univ, Sch Elect Engn, IL-69978 Ramat Aviv, Israel

关键词: Optical sensing and sensors;    Optical vortices;    Remote sensing and sensors;   

DOI  :  10.1016/j.optcom.2020.126557

来源: Elsevier

【 摘 要 】

We simulate and experimentally demonstrate the optical single-pixel identification of two-dimensional (2D) objects by analyzing the corresponding complex-valued (i.e, amplitude and phase) Laguerre-Gaussian (LG(l,p)) spectra containing both the azimuthal (i.e., l) and radial (i.e., p) indices. A sequence of optical beams, each carrying a different superposition of one LG mode and one fundamental Gaussian mode, propagate through the objects. The amplitude and phase contributions of each LG modal component are then obtained by four sequential power measurements using a single-pixel detector. We reconstruct the 2D spatial structures of fan shaped objects with different orientation angles and an SC logo using the measured complex LG spectra that contain 31 different azimuthal and 31 different radial index values. The simulation and experimental results show that (i) the minima positions of the amplitude-only LG sub-spectra (fixed l = 0, varying ) are dependent on the object's spatial information along its radial direction, (ii) the amplitude-only LG spectrum is likely to be insensitive to the object's orientation angle, and (iii) the slopes of the phase-only LG sub-spectra (fixed p, varying l) are linearly proportional to the object's orientation angle.

【 授权许可】

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