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Phase-Shifted Flat Lens Creates Perfect Image

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CAMBRIDGE, Mass., Aug. 24, 2012 — By moving the phase shifting of light to the surface of a lens instead of creating phase delays as it propagates through a material, Harvard engineers have created an ultrathin, flat lens that could potentially replace bulk components in optical systems. Conventional lenses impart distortions and optical aberrations, including the “fish eye” effect, astigmatism and coma aberrations. An artist’s rendition of a new ultrathin, flat lens focuses light without imparting the optical distortions of conventional lenses. (Image: Francesco Aieta) The new 60-nm-thick...Read full article

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    Published: August 2012
    Glossary
    astigmatism
    A lens aberration that results in the tangential and sagittal image planes being separated axially.
    distortion
    A general term referring to the situation in which an image is not a true-to-scale reproduction of an object. The term also is used to connote the temporal alteration of the signal's waveform shape. There are many types of distortion. See also anamorphic distortion; curvilinear distortion; keystone distortion; panoramic distortion; perspective distortion; radial distortion; stereoscopic distortion; tangential distortion; wide-angle distortion.
    nano
    An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    AmericaslensesWafersastigmatismcoma aberrationsCommunicationscorrective techniquesdistortionFederico Capassofiber opticsfish-eye aberrationsflat lensesFrancesco Aietagold layerHarvard School of Engineering and Applied SciencesHarvard SEASImagingItalylaws of diffractionMassachusettsmetasurfacenanonanoantennasoptical aberrationsoptical systemsOpticsphotonicsResearch & Technologysilicon wafertelecom wavelengthsterahertz wavelengthsultrathin flat lensUniversità Politecnica delle MarcheV-shaped structures

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