*ITAMP Lunch Seminar* *Speaker:* Prof. Federico Capasso (Harvard University) *Date:* Thursday, March 8th *Time:* 12:00-1:00 pm Includes Pizza. *Title: *Flat Optics : from Metalenses to Structured Light *Abstract: *Arrays of optically thin, sub-wavelength spaced optical elements (metasurfaces) have major potential for wavefront shaping through local control of the phase, amplitude and polarization of light [1]. Flat optics has emerged from this approach [2] with the goals of replacing refractive lenses in most applications requiring aberrations’ correction [3,4] as well as conventional phase plates used in polarization optics [5] and last but not least of providing a new path to the creation of structured light. [6] [1] N. Yu et al. Science 334, 333 (2011) [2] N. Yu and F. Capasso Nature Materials 13, 139 (2014) [3] M. Khorasaninejad et al. Science 352, 1190 (2016) [4] W-T. Chen et al. Nature Nanotechnology (2018) doi:10.1038/s41565-017-0034-6 [5] J. P. B. Mueller et al. Physical Review Letters 118, 113901 (2017) [6] R. C. Devlin et al. Science 358, 896 (2017) *Location: *Pratt conference room @ Center for Astrophysics (60 Garden Street) *Directions: *After entering the lobby of the CfA, use the staircase in front of you (toward to Wolbach library) to go to the ground floor, Pratt conference room will be at the end of the hallway on the left side.