Yu Wang, Peng Zhao, Xue Feng, K. Cui, Yidong Huang
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Integrated emitters for optical vortices with a “cobweb” structure
A “cobweb” structure is demonstrated to serve as the gratings for the emission of optical vortices, based on a microring cavity. The scattered optical vortices with topological charges of -4 ~ 4 were experimentally obtained.