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  • 1
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    Geometry-invariant resonant cavities (2016)
    Springer Nature
    Details
    Publication Date: 2016-03-26
    Description: Article Resonant cavities are a ubiquitous building block in science and technology. Here, Liberal et al . demonstrate theoretically the existence of resonators whose eigenfrequencies are invariant with respect to geometrical deformations of their external boundaries, by exploiting the unusual properties of zero-index metamaterials. Nature Communications doi: 10.1038/ncomms10989 Authors: I. Liberal, A. M. Mahmoud, N. Engheta
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 2
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    Mechanical 144 GHz beam steering with all-metallic epsilon-near-zero lens antenna (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-12-16
    Description: An all-metallic steerable beam antenna composed of an ε-near-zero (ENZ) metamaterial lens is experimentally demonstrated at 144 GHz ( λ 0  = 2.083 mm). The ENZ lens is realized by an array of narrow hollow rectangular waveguides working just near and above the cut-off of the TE 10 mode. The lens focal arc on the xz -plane is initially estimated analytically as well as numerically and compared with experimental results demonstrating good agreement. Next, a flange-ended WR-6.5 waveguide is placed along the lens focal arc to evaluate the ENZ-lens antenna steerability. A gain scan loss below 3 dB is achieved for angles up to ±15°.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 3
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    Applied physics. Antenna-guided light (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-10-25
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Engheta, Nader -- New York, N.Y. -- Science. 2011 Oct 21;334(6054):317-8. doi: 10.1126/science.1213278.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Pennsylvania, Department of Electrical and Systems Engineering, Philadelphia, PA 19104, USA. engheta@ee.upenn.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22021846" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Transformation optics using graphene (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-06-11
    Description: Metamaterials and transformation optics play substantial roles in various branches of optical science and engineering by providing schemes to tailor electromagnetic fields into desired spatial patterns. We report a theoretical study showing that by designing and manipulating spatially inhomogeneous, nonuniform conductivity patterns across a flake of graphene, one can have this material as a one-atom-thick platform for infrared metamaterials and transformation optical devices. Varying the graphene chemical potential by using static electric field yields a way to tune the graphene conductivity in the terahertz and infrared frequencies. Such degree of freedom provides the prospect of having different "patches" with different conductivities on a single flake of graphene. Numerous photonic functions and metamaterial concepts can be expected to follow from such a platform.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vakil, Ashkan -- Engheta, Nader -- New York, N.Y. -- Science. 2011 Jun 10;332(6035):1291-4. doi: 10.1126/science.1202691.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21659598" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    Performing mathematical operations with metamaterials (2014)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2014-01-11
    Description: We introduce the concept of metamaterial analog computing, based on suitably designed metamaterial blocks that can perform mathematical operations (such as spatial differentiation, integration, or convolution) on the profile of an impinging wave as it propagates through these blocks. Two approaches are presented to achieve such functionality: (i) subwavelength structured metascreens combined with graded-index waveguides and (ii) multilayered slabs designed to achieve a desired spatial Green's function. Both techniques offer the possibility of miniaturized, potentially integrable, wave-based computing systems that are thinner than conventional lens-based optical signal and data processors by several orders of magnitude.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Silva, Alexandre -- Monticone, Francesco -- Castaldi, Giuseppe -- Galdi, Vincenzo -- Alu, Andrea -- Engheta, Nader -- New York, N.Y. -- Science. 2014 Jan 10;343(6167):160-3. doi: 10.1126/science.1242818.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24408430" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Circuits with light at nanoscales: optical nanocircuits inspired by metamaterials (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-09-22
    Description: A form of optical circuitry is overviewed in which a tapestry of subwavelength nanometer-scale metamaterial structures and nanoparticles may provide a mechanism for tailoring, patterning, and manipulating local optical electric fields and electric displacement vectors in a subwavelength domain, leading to the possibility of optical information processing at the nanometer scale. By exploiting the optical properties of metamaterials, these nanoparticles may play the role of "lumped" nanocircuit elements such as nanoinductors, nanocapacitors, and nanoresistors, analogous to microelectronics. I show that this concept of metamaterial-inspired nanoelectronics ("metactronics") can bring the tools and mathematical machinery of the circuit theory into optics, may link the fields of optics, electronics, plasmonics, and metamaterials, and may provide road maps to future innovations in nanoscale optical devices, components, and more intricate nanoscale metamaterials.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Engheta, Nader -- New York, N.Y. -- Science. 2007 Sep 21;317(5845):1698-702.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Pennsylvania, Department of Electrical and Systems Engineering, Philadelphia, PA 19104, USA. engheta@ee.upenn.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17885123" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Materials science. Pursuing near-zero response (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2013-04-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Engheta, Nader -- New York, N.Y. -- Science. 2013 Apr 19;340(6130):286-7. doi: 10.1126/science.1235589.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Pennsylvania, Department of Electrical and Systems Engineering, Philadelphia, PA 19104, USA. engheta@ee.upenn.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23599473" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    OPTICS. 150 years of Maxwell's equations (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-07-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Engheta, Nader -- New York, N.Y. -- Science. 2015 Jul 10;349(6244):136-7. doi: 10.1126/science.aaa7224.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Pennsylvania, Department of Electrical and Systems Engineering, Philadelphia, PA 19104, USA. engheta@ee.upenn.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26160929" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    Lensing system and Fourier transformation using epsilon-near-zero metamaterials (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-10-24
    Description: Author(s): M. Navarro-Cía, M. Beruete, M. Sorolla, and N. Engheta Metamaterials and metastructures with effective relative permittivity near zero exhibit unusual wave properties such as uniform phase distributions across such domains. Here we discuss the possibility of using ε-near-zero (ENZ) metamaterials for lensing and Fourier transforming. Owing to the possibi... [Phys. Rev. B 86, 165130] Published Tue Oct 23, 2012
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
    Electronic Resource
    Electronic Resource
    Ambartsumian's principle of invariance and the reflection of radio waves from plane inhomogeneous slabs (1983)
    Springer
    Applied physics 30 (1983), S. 183-188 
    Details
    ISSN: 1432-0649
    Keywords: 41 ; 42.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using Ambartsumian's principle of invariance we investigate for radio waves the reflection coefficient of a plane inhomogeneous slab. We find that the reflection coefficient, as a function of slab thickness, satisfies the Riccati equation. From this equation we deduce a geometric theorem on the upper and lower bounds of the reflection coefficient. We illustrate the theorem by applying it to several special cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688404
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    Paper (German National Licenses)
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