Review of numerical optimization techniques for meta-device design [Invited] Campbell, Sawyer D. ; Sell, David ; Jenkins, Ronald P. ; Whiting, Eric B. ; Fan, Jonathan A. ; Werner, Douglas H. Abstract Publication: Optical Materials Express Pub Date: April 2019 DOI: 10.1364/OME.9.001842 Bibcode: 2019OMExp...9.1842C