@article {Zilio2014,
	title = {Bilayer holey plasmonic vortex lenses for the far field transmission of pure orbital angular momentum light states},
	journal = {Optics Letters},
	volume = {39},
	number = {16},
	year = {2014},
	month = {aug},
	pages = {4899–4902},
	doi = {10.1364/OL.39.004899},
	author = {Zilio, Pierfrancesco and Parisi, Giuseppe and Garoli, Denis and Carli, Marta and Romanato, Filippo}
}
