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      High-efficiency chiral meta-lens

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          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          We present here a compact metasurface lens element that enables simultaneous and spatially separated imaging of light of opposite circular polarization states. The design overcomes a limitation of previous chiral lenses reliant on the traditional geometric phase approach by allowing for independent focusing of both circular polarizations without a 50% efficiency trade-off. We demonstrate circular polarization-dependent imaging at visible wavelengths with polarization contrast greater than 20dB and efficiencies as high as 70%.

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          Arbitrary spin-to-orbital angular momentum conversion of light

          Federico Capasso, J Mueller, Noah Rubin … (2017)
          Optical elements that convert the spin angular momentum (SAM) of light into vortex beams have found applications in classical and quantum optics. These elements, SAM to orbital angular momentum (OAM) converters, are based on the geometric phase and only permit the conversion of left- and right-circular polarizations (spin states) into states with opposite OAM. We present a method for converting arbitrary SAM states into total angular momentum states characterized by a superposition of independent OAM. We design a metasurface that converts left- and right-circular polarizations into states with independent values of OAM, and another device that performs this operation for elliptically polarized states. These results illustrate a general material-mediated connection between SAM and OAM of light and may find applications in producing complex structured light and in optical communication.
          Article 0 comments Cited 235 times – based on 0 reviews     Review now
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            The Adiabatic Phase and Pancharatnam's Phase for Polarized Light

            M.V. Berry (1987)
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              Structural origin of circularly polarized iridescence in jeweled beetles.

              Vivek Sharma, Matija Crne, Jung Park … (2009)
              The iridescent metallic green beetle, Chrysina gloriosa, which selectively reflects left circularly polarized light, possesses an exoskeleton decorated by hexagonal cells (approximately 10 microm) that coexist with pentagons and heptagons. The fraction of hexagons decreases with an increase in curvature. In bright field microscopy, each cell contains a bright yellow core, placed in a greenish cell with yellowish border, but the core disappears in dark field. With use of confocal microscopy, we observe that these cells consist of nearly concentric nested arcs that lie on the surface of a shallow cone. We infer that the patterns are structurally and optically analogous to the focal conic domains formed spontaneously on the free surface of a cholesteric liquid crystal. These textures provide the basis for the morphogenesis as well as key insights for emulating the intricate optical response of the exoskeleton of scarab beetles.
              Article 0 comments Cited 186 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Federico Capasso: capasso@seas.harvard.edu
                Journal
                Journal ID (nlm-ta): Sci Rep
                Journal ID (iso-abbrev): Sci Rep
                Title: Scientific Reports
                Publisher: Nature Publishing Group UK (London )
                ISSN (Electronic): 2045-2322
                Publication date (Electronic): 8 May 2018
                Publication date PMC-release: 8 May 2018
                Publication date Collection: 2018
                Volume: 8
                Electronic Location Identifier: 7240
                Affiliations
                ISNI 000000041936754X, GRID grid.38142.3c, John A. Paulson School of Engineering and Applied Sciences, , Harvard University, ; Cambridge, MA USA
                Author information
                http://orcid.org/0000-0002-8020-4737
                Article
                Publisher ID: 25675
                DOI: 10.1038/s41598-018-25675-3
                PMC ID: 5940891
                PubMed ID: 29740171
                SO-VID: 457f1d5f-8032-45ef-924b-1258a5f95532
                Copyright © © The Author(s) 2018
                License:

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                Date received : 31 January 2018
                Date accepted : 24 April 2018
                Categories
                Subject: Article
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                issue-copyright-statement © The Author(s) 2018

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