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  • 1
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    Unidirectional Spaser in Symmetry-Broken Plasmonic Core-Shell Nanocavity (2013)
    Springer Nature
    Details
    Publication Date: 2013-02-08
    Description: The spaser, a quantum amplifier of surface plasmons by stimulated emission of radiation, is recognized as a coherent light source capable of confining optical fields at subwavelength scale. The control over the directionality of spasing has not been addressed so far, especially for a single-particle spasing nanocavity where optical feedback is solely provided by a plasmon resonance. In this work we numerically examine an asymmetric spaser – a resonant system comprising a dielectric core capped by a metal semishell. The proposed spaser emits unidirectionally along the axis of the semishell; this directionality depends neither on the incident polarization nor on the incident angle of the pump. The spasing efficiency of the semishell-capped resonator is one order of magnitude higher than that in the closed core-shell counterpart. Our calculations indicate that symmetry breaking can serve as a route to create unidirectional, highly intense, single-particle, coherent light sources at subwavelength scale. Scientific Reports 3 doi: 10.1038/srep01241
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 2
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    Sensors, Vol. 11, Pages 7178-7187: Numerical Modeling of Plasmonic Nanoantennas with Realistic 3D Roughness and Distortion (2011)
    MDPI Publishing
    In: Sensors
    Details
    Publication Date: 2011-07-21
    Description: Nanostructured plasmonic metamaterials, including optical nanoantenna arrays, are important for advanced optical sensing and imaging applications including surface-enhanced fluorescence, chemiluminescence, and Raman scattering. Although designs typically use ideally smooth geometries, realistic nanoantennas have nonzero roughness, which typically results in a modified enhancement factor that should be involved in their design. Herein we aim to treat roughness by introducing a realistic roughened geometry into the finite element (FE) model. Even if the roughness does not result in significant loss, it does result in a spectral shift and inhomogeneous broadening of the resonance, which could be critical when fitting the FE simulations of plasmonic nanoantennas to experiments. Moreover, the proposed approach could be applied to any model, whether mechanical, acoustic, electromagnetic, thermal, etc, in order to simulate a given roughness-generated physical phenomenon.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by MDPI Publishing
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  • 3
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    Formation of Bound States in the Continuum in Hybrid Plasmonic-Photonic Systems (2018)
    American Physical Society (APS)
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    Publication Date: 2018-12-21
    Description: Author(s): Shaimaa I. Azzam, Vladimir M. Shalaev, Alexandra Boltasseva, and Alexander V. Kildishev A bound state in the continuum (BIC) is a localized state of an open structure with access to radiation channels, yet it remains highly confined with, in theory, an infinite lifetime and quality factor. There have been many realizations of such exceptional states in dielectric systems without loss. ... [Phys. Rev. Lett. 121, 253901] Published Thu Dec 20, 2018
    Keywords: Nonlinear Dynamics, Fluid Dynamics, Classical Optics, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 4
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    Loss-free and active optical negative-index metamaterials (2010)
    Nature Publishing Group (NPG)
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    Publication Date: 2010-08-06
    Description: The recently emerged fields of metamaterials and transformation optics promise a family of exciting applications such as invisibility, optical imaging with deeply subwavelength resolution and nanophotonics with the potential for much faster information processing. The possibility of creating optical negative-index metamaterials (NIMs) using nanostructured metal-dielectric composites has triggered intense basic and applied research over the past several years. However, the performance of all NIM applications is significantly limited by the inherent and strong energy dissipation in metals, especially in the near-infrared and visible wavelength ranges. Generally the losses are orders of magnitude too large for the proposed applications, and the reduction of losses with optimized designs seems to be out of reach. One way of addressing this issue is to incorporate gain media into NIM designs. However, whether NIMs with low loss can be achieved has been the subject of theoretical debate. Here we experimentally demonstrate that the incorporation of gain material in the high-local-field areas of a metamaterial makes it possible to fabricate an extremely low-loss and active optical NIM. The original loss-limited negative refractive index and the figure of merit (FOM) of the device have been drastically improved with loss compensation in the visible wavelength range between 722 and 738 nm. In this range, the NIM becomes active such that the sum of the light intensities in transmission and reflection exceeds the intensity of the incident beam. At a wavelength of 737 nm, the negative refractive index improves from -0.66 to -1.017 and the FOM increases from 1 to 26. At 738 nm, the FOM is expected to become macroscopically large, of the order of 10(6). This study demonstrates the possibility of fabricating an optical negative-index metamaterial that is not limited by the inherent loss in its metal constituent.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xiao, Shumin -- Drachev, Vladimir P -- Kildishev, Alexander V -- Ni, Xingjie -- Chettiar, Uday K -- Yuan, Hsiao-Kuan -- Shalaev, Vladimir M -- England -- Nature. 2010 Aug 5;466(7307):735-8. doi: 10.1038/nature09278.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Birck Nanotechnology Center and School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20686570" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 5
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    Broadband light bending with plasmonic nanoantennas (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-12-24
    Description: The precise manipulation of a propagating wave using phase control is a fundamental building block of optical systems. The wavefront of a light beam propagating across an interface can be modified arbitrarily by introducing abrupt phase changes. We experimentally demonstrated unparalleled wavefront control in a broadband optical wavelength range from 1.0 to 1.9 micrometers. This is accomplished by using an extremely thin plasmonic layer (~lambda/50) consisting of an optical nanoantenna array that provides subwavelength phase manipulation on light propagating across the interface. Anomalous light-bending phenomena, including negative angles of refraction and reflection, are observed in the operational wavelength range.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ni, Xingjie -- Emani, Naresh K -- Kildishev, Alexander V -- Boltasseva, Alexandra -- Shalaev, Vladimir M -- New York, N.Y. -- Science. 2012 Jan 27;335(6067):427. doi: 10.1126/science.1214686. Epub 2011 Dec 22.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22194414" 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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    Planar photonics with metasurfaces (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2013-03-16
    Description: Metamaterials, or engineered materials with rationally designed, subwavelength-scale building blocks, allow us to control the behavior of physical fields in optical, microwave, radio, acoustic, heat transfer, and other applications with flexibility and performance that are unattainable with naturally available materials. In turn, metasurfaces-planar, ultrathin metamaterials-extend these capabilities even further. Optical metasurfaces offer the fascinating possibility of controlling light with surface-confined, flat components. In the planar photonics concept, it is the reduced dimensionality of the optical metasurfaces that enables new physics and, therefore, leads to functionalities and applications that are distinctly different from those achievable with bulk, multilayer metamaterials. Here, we review the progress in developing optical metasurfaces that has occurred over the past few years with an eye toward the promising future directions in the field.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kildishev, Alexander V -- Boltasseva, Alexandra -- Shalaev, Vladimir M -- New York, N.Y. -- Science. 2013 Mar 15;339(6125):1232009. doi: 10.1126/science.1232009.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23493714" 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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    Ultrathin and multicolour optical cavities with embedded metasurfaces (2018)
    Springer Nature
    Details
    Publication Date: 2018-07-11
    Description: Ultrathin and multicolour optical cavities with embedded metasurfaces Ultrathin and multicolour optical cavities with embedded metasurfaces, Published online: 10 July 2018; doi:10.1038/s41467-018-05034-6 Achieving miniature and versatile nanophotonic devices with metasurfaces is of great interest. The authors embed a metasurface inside an optical cavity to reduce thickness and provide degrees of freedom for controlling resonant wavelengths, enabling multi-band filtering, structural colouration and spectral imaging.
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 8
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    Metasurface holograms for visible light (2013)
    Springer Nature
    Details
    Publication Date: 2013-11-17
    Description: Article Holographic techniques provide phase and amplitude information for images of objects, but normally the hologram thickness is comparable to the light wavelength used. Ni et al. present ultra-thin plasmonic holograms that control amplitude and phase in the visible region and are just 30 nm thick. Nature Communications doi: 10.1038/ncomms3807 Authors: Xingjie Ni, Alexander V. Kildishev, Vladimir M. Shalaev
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 9
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    Metasurface perfect absorber based on guided resonance of a photonic hypercrystal (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-10-18
    Description: Author(s): You-Chia Chang, Alexander V. Kildishev, Evgenii E. Narimanov, and Theodore B. Norris By exploiting the guided resonance of a photonic hypercrystal—a periodic structure that combines the properties of hyperbolic materials and photonic crystals—we numerically demonstrate a perfect absorber consisting of a photonic hypercrystal slab, a dielectric spacer, and a back reflector. The guide… [Phys. Rev. B 94, 155430] Published Mon Oct 17, 2016
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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