@article {540406,
	title = {Truly achromatic optical metasurfaces: a filter circuit theory-based design},
	journal = {JOSA B},
	volume = {32},
	year = {2015},
	pages = {2115},
	url = {http://dx.doi.org/10.1364/JOSAB.32.002115},
	author = {Jierong Cheng and Hossein Mosallaei}
}
