@article {1462998,
	title = {Ultrathin and multicolour optical cavities with embedded metasurfaces},
	journal = {Nature Communications},
	volume = {9},
	year = {2018},
	pages = {2673},
	author = {AM Shaltout and Kim, J. and A. Boltasseva and V. M. Shalaev and A. V. Kildishev}
}
