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      Nearly perfect resonant absorption and coherent thermal emission by hBN-based photonic crystals

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      Author(s)
      Hajian, H.
      Ghobadi, A.
      Butun, B.
      Özbay, Ekmel
      Date
      2017
      Source Title
      Optics Express
      Print ISSN
      1094-4087
      Publisher
      Optical Society of America
      Volume
      25
      Issue
      25
      Pages
      31970 - 31987
      Language
      English
      Type
      Article
      Item Usage Stats
      250
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      219
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      Abstract
      In this paper, we numerically demonstrate mid-IR nearly perfect resonant absorption and coherent thermal emission for both polarizations and wide angular region using multilayer designs of unpatterned films of hexagonal boron nitride (hBN). In these optimized structures, the films of hBN are transferred onto a Ge spacer layer on top of a one-dimensional photonic crystal (1D PC) composed of alternating layers of KBr and Ge. According to the perfect agreements between our analytical and numerical results, we discover that the mentioned optical characteristic of the hBN-based 1D PCs is due to a strong coupling between localized photonic modes supported by the PC and the phononic modes of hBN films. These coupled modes are referred as Tamm phonons. Moreover, our findings prove that the resonant absorptions can be red- or blue-shifted by changing the thickness of hBN and the spacer layer. The obtained results in this paper are beneficial for designing coherent thermal sources, light absorbers, and sensors operating within 6.2 μm to 7.3 μm in a wide angular range and both polarizations. The planar and lithography free nature of this multilayer design is a prominent factor that makes it a large scale compatible design. © 2017 Optical Society of America.
      Keywords
      Absorption
      Photonic crystals
      Surface waves
      Surface plasmon polaritons
      Surface plasmons
      Thermal emission
      Microcomputers
      Multilayer films
      Multilayers
      Polarization
      Alternating layers
      Coherent thermal emission
      Hexagonal boron nitride (h-BN)
      Multilayer designs
      One-dimensional photonic crystal (1D PC)
      Optical characteristics
      Optimized structures
      Resonant absorption
      Potassium compounds
      Permalink
      http://hdl.handle.net/11693/37027
      Published Version (Please cite this version)
      https://doi.org/10.1364/OE.25.031970
      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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