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      Diffraction Interference Induced Superfocusing in Nonlinear Talbot Effect

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          Abstract

          We report a simple, novel subdiffraction method, i.e. diffraction interference induced superfocusing in second-harmonic (SH) Talbot effect, to achieve focusing size of less than λ SH/4 (or λ pump/8) without involving evanescent waves or subwavelength apertures. By tailoring point spread functions with Fresnel diffraction interference, we observe periodic SH subdiffracted spots over a hundred of micrometers away from the sample. Our demonstration is the first experimental realization of the Toraldo di Francia's proposal pioneered 62 years ago for superresolution imaging.

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          Far-field optical nanoscopy.

          Stefan Hell (2007)
          In 1873, Ernst Abbe discovered what was to become a well-known paradigm: the inability of a lens-based optical microscope to discern details that are closer together than half of the wavelength of light. However, for its most popular imaging mode, fluorescence microscopy, the diffraction barrier is crumbling. Here, I discuss the physical concepts that have pushed fluorescence microscopy to the nanoscale, once the prerogative of electron and scanning probe microscopes. Initial applications indicate that emergent far-field optical nanoscopy will have a strong impact in the life sciences and in other areas benefiting from nanoscale visualization.
          Article 0 comments Cited 674 times – based on 0 reviews     Review now
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            Negative refraction makes a perfect lens

            Elizabeth Pendry, K Pendry (2001)
            With a conventional lens sharpness of the image is always limited by the wavelength of light. An unconventional alternative to a lens, a slab of negative refractive index material, has the power to focus all Fourier components of a 2D image, even those that do not propagate in a radiative manner. Such "superlenses" can be realized in the microwave band with current technology. Our simulations show that a version of the lens operating at the frequency of visible light can be realized in the form of a thin slab of silver. This optical version resolves objects only a few nanometers across.
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              Superlenses to overcome the diffraction limit.

              Xiang Zhang, Zhaowei Liu (2008)
              The imaging resolution of conventional lenses is limited by diffraction. Artificially engineered metamaterials now offer the possibility of building a superlens that overcomes this limit. We review the physics of such superlenses and the theoretical and experimental progress in this rapidly developing field. Superlenses have great potential in applications such as biomedical imaging, optical lithography and data storage.
              Article 0 comments Cited 277 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Sci Rep
                Journal ID (iso-abbrev): Sci Rep
                Title: Scientific Reports
                Publisher: Nature Publishing Group
                ISSN (Electronic): 2045-2322
                Publication date (Electronic): 20 August 2014
                Publication date Collection: 2014
                Volume: 4
                Electronic Location Identifier: 6134
                Affiliations
                [1 ]National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, School of Physics, Nanjing University , Nanjing 210093, China
                [2 ]Department of Applied Physics, Yale University , New Haven, Connecticut 06511, USA
                [3 ]Department of Physics, University of Arkansas , Fayetteville, Arkansas 72701, USA
                Author notes
                Article
                Publisher Item ID: srep06134
                DOI: 10.1038/srep06134
                PMC ID: 4138516
                PubMed ID: 25138077
                SO-VID: 86411af8-4309-4c9d-869a-9856f626dcd2
                Copyright © Copyright © 2014, Macmillan Publishers Limited. All rights reserved
                License:

                This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/

                History
                Date received : 12 May 2014
                Date accepted : 24 July 2014
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                Subject: Article

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