J. Engelberg and U. Levy, "Achromatic flat lens performance limits," Optica 8, 834-845 (2021).
J. Engelberg et al., "Near-IR wide-field-of-view Huygens metalens for outdoor imaging applications," Nanophotonics 9, 361-370 (2020)
Y.M. Engelberg and S. Ruschin, "Fast method for physical optics propagation of high numerical-aperture beams," JOSA A 21, 2135-2145 (2004)