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      • Abstract: found
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      Ultrasonic Lens Based on a Subwavelength Slit Surrounded by Grooves

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          Abstract

          The lensing capabilities of a single subwavelength slit surrounded by a finite array of grooves milled into a brass plate is presented. The modulation of the beam intensity of this ultrasonic lens can be adjusted by varying the groove depth. Numerical simulations as well as experimental validations at 290 kHz are shown. The experimental results are in good agreement with the numerical simulations. This system is believed to have potential applications for medical ultrasound fields such as tomography and therapy.

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          A perfectly matched layer for the absorption of electromagnetic waves

          Jean-Pierre Berenger (1994)
          Article 0 comments Cited 987 times – based on 0 reviews     Review now
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            Light in tiny holes.

            C. Genet, T. W. Ebbesen (2007)
            The presence of tiny holes in an opaque metal film, with sizes smaller than the wavelength of incident light, leads to a wide variety of unexpected optical properties such as strongly enhanced transmission of light through the holes and wavelength filtering. These intriguing effects are now known to be due to the interaction of the light with electronic resonances in the surface of the metal film, and they can be controlled by adjusting the size and geometry of the holes. This knowledge is opening up exciting new opportunities in applications ranging from subwavelength optics and optoelectronics to chemical sensing and biophysics.
            Article 0 comments Cited 411 times – based on 0 reviews     Review now
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              Beaming light from a subwavelength aperture.

              H J Lezec, A. Degiron, E Devaux … (2002)
              Light usually diffracts in all directions when it emerges from a subwavelength aperture, which puts a lower limit on the size of features that can be used in photonics. This limitation can be overcome by creating a periodic texture on the exit side of a single aperture in a metal film. The transmitted light emerges from the aperture as a beam with a small angular divergence (approximately +/-3 degrees ) whose directionality can be controlled. This finding is especially surprising, considering that the radiating region is mainly confined to an area with lateral dimensions comparable to the wavelength of the light. The device occupies no more than one cubic micrometer and, when combined with enhanced transmission, suggests that a wide range of photonic applications is possible.
              Article 0 comments Cited 295 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Sensors (Basel)
                Journal ID (iso-abbrev): Sensors (Basel)
                Title: Sensors (Basel, Switzerland)
                Publisher: Molecular Diversity Preservation International (MDPI)
                ISSN (Electronic): 1424-8220
                Publication date Collection: May 2014
                Publication date (Electronic): 19 May 2014
                Volume: 14
                Issue: 5
                Pages: 8821-8828
                Affiliations
                Centro de Tecnologías Físicas, Universitat Politécnica de Valencia, Camino de Vera s/n. 46022 Valencia, Spain; E-Mails: vgomez@ 123456fis.upv.es (V.G.-L.); pcandelas@ 123456fis.upv.es (P.C.); fbelmar@ 123456fis.upv.es (F.B.); crubiom@ 123456fis.upv.es (C.R.)
                Author notes

                Author Contributions: Antonio Uris has coordinated the theoretical and experimental developments, participating in the establishment of the theory principles used in this work, as well as in the drafting of the manuscript. Vicente Gomez-Lozano has developed part of the theory used and has designed some characterization experiments and has developed some computing task, as well as has participated in the drafting of the manuscript. Pilar Candelas, Francisco Belmar and Constanza Rubio have designed and carried out the characterization of the experimental setup and in computing algorithms for the treatment of data, also have participated in the analysis of the state of art and in the design of some experiments, as well as in the drafting of the manuscript.

                [* ]Author to whom correspondence should be addressed; E-Mail: auris@ 123456fis.upv.es ; Tel.: +34-963-877-528; Fax: +34-963-879-525.
                Article
                Publisher ID: sensors-14-08821
                DOI: 10.3390/s140508821
                PMC ID: 4063062
                PubMed ID: 24854059
                SO-VID: 69810ee1-e2d1-4696-ba80-d3a114c82cff
                Copyright © © 2014 by the authors; licensee MDPI, Basel, Switzerland.
                License:

                This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license ( http://creativecommons.org/licenses/by/3.0/).

                History
                Date received : 10 April 2014
                Date revision received : 07 May 2014
                Date accepted : 15 May 2014
                Categories
                Subject: Letter

                ScienceOpen disciplines: Biomedical engineering
                Keywords: subwavelength slit,ultrasonic lens,grooves array
                Data availability:
                ScienceOpen disciplines: Biomedical engineering
                Keywords: subwavelength slit, ultrasonic lens, grooves array

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