supported by the National Key Research and Development Program of China(Grant No.2017YFA0206000);National Basic Research Program of China(973 Program,Grant No.2015CB932403,2017YFA0205700);the National Science Foundation of China(Grant No.61422501,11674012,11374023,61176120,61378059 and 61521004);the Foundation for the Author of the National Excellent Doctoral Dissertation of PR China(Grant No.201420);the National Program for Support of Top-notch Young Professionals.
A multifocal metalens,which focuses incident light at multiple foci,has many applications in imaging systems and optical communications.However,the traditional design strategy of a multifocal metalens combines several...