title: Achromatic Metasurface Lens at Telecommunication Wavelengths.
abstract: Nanoscale optical resonators enable a new class of flat optical components called metasurfaces. This approach has been used to demonstrate functionalities such as focusing free of monochromatic aberrations (i.e., spherical and coma), anomalous reflection, and large circular dichroism. Recently, dielectric metasurfaces that compensate the phase dispersion responsible for chromatic aberrations have been demonstrated. Here, we utilize an aperiodic array of coupled dielectric nanoresonators to demonstrate a multiwavelength achromatic lens. The focal length remains unchanged for three wavelengths in the near-infrared region (1300, 1550, and 1800 nm). Experimental results are in agreement with full-wave simulations. Our findings are an essential step toward a realization of broadband flat optical elements.
authors.affiliation: †School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.
authors.forename: Mohammadreza
authors.initials: M
authors.lastname: Khorasaninejad
authors.affiliation: †School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.|‡Hewlett-Packard Laboratories, Palo Alto, California 94304, United States.
authors.forename: Francesco
authors.initials: F
authors.lastname: Aieta
authors.affiliation: †School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.|§University of Waterloo, Waterloo, ON N2L 3G1, Canada.
authors.forename: Pritpal
authors.initials: P
authors.lastname: Kanhaiya
authors.affiliation: †School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.|∥Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.
authors.forename: Mikhail A
authors.initials: MA
authors.lastname: Kats
authors.affiliation: †School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.|⊥Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, Singapore 638075, Singapore.
authors.forename: Patrice
authors.initials: P
authors.lastname: Genevet
authors.affiliation: †School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.|§University of Waterloo, Waterloo, ON N2L 3G1, Canada.
authors.forename: David
authors.initials: D
authors.lastname: Rousso
authors.affiliation: †School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.
authors.forename: Federico
authors.initials: F
authors.lastname: Capasso
keywords: Metasurfaces; achromatic; dielectric resonators; lens