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      Bright off-axis directional emission with plasmonic corrugations

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      Author(s)
      Sattari, H.
      Rashed, A. R.
      Özbay, Ekmel
      Caglayan, H.
      Date
      2017
      Source Title
      Optics Express
      Print ISSN
      1094-4087
      Publisher
      OSA - The Optical Society
      Volume
      25
      Issue
      25
      Pages
      30827 - 30842
      Language
      English
      Type
      Article
      Item Usage Stats
      201
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      168
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      Abstract
      In this work, a new plasmonic bulls-eye structure is introduced to efficiently harvest the emitted light from diamond nitrogen vacancy (NV) centers. We show that the presence of a simple metal sub-layer underneath of a conventional bulls-eye antenna, separated by a dielectric layer, results in the spontaneous emission enhancement and increment in out-coupled light intensity. High Purcell factor is accessible in such a structure, which consequently boosts efficiency of the radiated light intensity from the structure. The structure shows considerable enhancement in far-field intensity, about three times higher than that of a one-side corrugated (conventional) optimized structure. In addition, we study for the first time asymmetric structures to steer emitted beams in two-axis. Our results show that spatial off-axial steering over a cone is approachable by introducing optimal asymmetries to grooves and ridges of the structure. The steered light retains a level of intensity even higher than conventional symmetric structures. A high value of directivity of 16 for off-axis steering is reported. © 2017 Optical Society of America.
      Keywords
      Dielectric materials
      Asymmetric structures
      Dielectric layer
      Directional emission
      Far-field intensity
      Nitrogen vacancies
      Optimized structures
      Spontaneous emission enhancement
      Symmetric structures
      Plasmons
      Permalink
      http://hdl.handle.net/11693/37028
      Published Version (Please cite this version)
      http://dx.doi.org/10.1364/OE.25.030827
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
      • Nanotechnology Research Center (NANOTAM) 1179
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