@article { ISI:000387625000075,
	title = {Polarization-Insensitive Metalenses at Visible Wavelengths},
	journal = {NANO LETTERS},
	volume = {16},
	number = {11},
	year = {2016},
	month = {NOV},
	pages = {7229-7234},
	publisher = {AMER CHEMICAL SOC},
	type = {Article},
	address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA},
	abstract = {In this Letter, we demonstrate highly efficient, polarization-insensitive planar lenses (metalenses) at red, green, and blue wavelengths (lambda = 660, 532, and 405 nm). Metalenses with numerical apertures (NA) of 0.85 and 0.6 and corresponding efficiencies as high as 60\% and 90\% are achieved. These metalenses are less than 600 nm-thick and can focus incident light down to diffraction-limited spots as small as similar to 0.64 lambda and provide high-resolution imaging. In addition, the focal spots are very symmetric with high Strehl ratios. The single step lithography and compatibility with large-scale fabrication processes make metalenses highly promising for widespread applications in imaging and spectroscopy.},
	keywords = {metasurface, polarization-insensitive metalenses, titanium dioxide, visible wavelength},
	issn = {1530-6984},
	doi = {10.1021/acs.nanolett.6b03626},
	author = {M. Khorasaninejad and Zhuit, A. Y. and C. Roques-Carmes and W. T. Chen and J. Oh and I. Mishra and R. C. Devlin and F. Capasso}
}
