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      97 percent light absorption in an ultrabroadband frequency range utilizing an ultrathin metal layer: randomly oriented, densely packed dielectric nanowires as an excellent light trapping scaffold

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      Author(s)
      Ghobadi, A.
      Dereshgi, S. A.
      Hajian, H.
      Birant, G.
      Butun, B.
      Bek, A.
      Özbay, Ekmel
      Date
      2017
      Source Title
      Nanoscale
      Print ISSN
      2040-3364
      Publisher
      Royal Society of Chemistry
      Volume
      9
      Issue
      43
      Pages
      16652 - 16660
      Language
      English
      Type
      Article
      Item Usage Stats
      261
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      378
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      Abstract
      In this paper, we propose a facile and large scale compatible design to obtain perfect ultrabroadband light absorption using metal-dielectric core-shell nanowires. The design consists of atomic layer deposited (ALD) Pt metal uniformly wrapped around hydrothermally grown titanium dioxide (TiO2) nanowires. It is found that the randomly oriented dense TiO2 nanowires can impose excellent light trapping properties where the existence of an ultrathin Pt layer (with a thickness of 10 nm) can absorb the light in an ultrabroadband frequency range with an amount near unity. Throughout this study, we first investigate the formation of resonant modes in the metallic nanowires. Our findings prove that a nanowire structure can support multiple longitudinal localized surface plasmons (LSPs) along its axis together with transverse resonance modes. Our investigations showed that the spectral position of these resonance peaks can be tuned with the length, radius, and orientation of the nanowire. Therefore, TiO2 random nanowires can contain all of these features simultaneously in which the superposition of responses for these different geometries leads to a flat perfect light absorption. The obtained results demonstrate that taking unique advantages of the ALD method, together with excellent light trapping of chemically synthesized nanowires, a perfect, bifacial, wide angle, and large scale compatible absorber can be made where an excellent performance is achieved while using less materials.
      Keywords
      Atomic layer deposition
      Dielectric materials
      Electromagnetic wave absorption
      High-k dielectric
      Light absorption
      Metals
      Platinum
      Scaffolds
      Titanium compounds
      Titanium dioxide
      Atomic layer deposited
      Dielectric nanowires
      Different geometry
      Localized surface plasmon
      Nanowire structures
      Titanium dioxides (TiO2)
      Transverse resonance mode
      Ultrathin metal layers
      Nanowires
      Permalink
      http://hdl.handle.net/11693/37236
      Published Version (Please cite this version)
      http://dx.doi.org/10.1039/c7nr04186a
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
      • Nanotechnology Research Center (NANOTAM) 1179
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