@article { ISI:000453488800050,
	title = {Broadband Achromatic Metasurface-Refractive Optics},
	journal = {NANO LETTERS},
	volume = {18},
	number = {12},
	year = {2018},
	month = {DEC},
	pages = {7801-7808},
	publisher = {AMER CHEMICAL SOC},
	type = {Article},
	address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA},
	abstract = {Existing methods of correcting for chromatic aberrations in optical systems are limited to two approaches: varying the material dispersion in refractive lenses or incorporating grating dispersion via diffractive optical elements. Recently, single-layer broadband achromatic meta surface lenses have been demonstrated but are limited to diameters on the order of 100 mu cm due to the large required group delays. Here, we circumvent this limitation and design a metacorrector by combining a tunable phase and artificial dispersion to correct spherical and chromatic aberrations in a large spherical plano-convex lens. The tunability results from a variation in light confinement in sub-wavelength waveguides by locally tailoring the effective refractive index. The effectiveness of this approach is further validated by designing a metacorrector, which greatly increases the of a state-of-the-art immersion objective (composed of 14 lenses and 7 types of glasses) from violet to near-infrared wavelengths. This concept of hybrid metasurface-refractive optics combines the advantages of both technologies in terms of size, scalability, complexity, and functionality.},
	keywords = {achromatic metalens, Dispersion engineering, metasurface, polarization-insensitive, titanium dioxide, Visible Spectrum},
	issn = {1530-6984},
	doi = {10.1021/acs.nanolett.8b03567},
	author = {Wei Ting Chen and Alexander Y. Zhu and Jared Sisler and Yao-Wei Huang and Kerolos M.A. Yousef and Eric Lee and Cheng-Wei Qiu and Federico Capasso}
}
