Abstract
We propose a grating-based spatial differentiator to process a synthetic three-dimensional optical field, where several conventional two-dimensional optical images are stacked at multiple wavelengths. The device simultaneously enables both spatial differentiation and demultiplexing during light diffraction. We show the spatial differentiation resulting from coupling and interference of spatial modes and derive the theoretical condition for spatial differentiation based on spatial coupled-mode theory. We numerically investigate field transformation during diffraction and demonstrate spatial differentiation with image processing of edge detection for a synthetic three-dimensional optical field, where four images are stored at different wavelengths.
© 2018 Optical Society of America
Full Article | PDF ArticleMore Like This
Di Mo, Ran Wang, Ning Wang, Tian Lv, Ke-Shu Zhang, and Yi-Rong Wu
Opt. Lett. 43(4) 839-842 (2018)
Dingyu Xu, Shanshan He, Junxiao Zhou, Shizhen Chen, Shuangchun Wen, and Hailu Luo
Opt. Lett. 45(24) 6867-6870 (2020)
Yisheng Fang, Yijie Lou, and Zhichao Ruan
Opt. Lett. 42(19) 3840-3843 (2017)