@article {1463677,
	title = {Polarization-independent metasurface lens employing the Pancharatnam-Berry phase},
	journal = {Optics Express},
	volume = {26},
	number = {19},
	year = {2018},
	pages = {24835-24842},
	author = {Lin, D. and AL Holsteen and E Maguid and P Fan and PG Kik and E Hasman and ML Brongersma}
}
