1 Ocak 2018 Dergi makalesi Açık Erişim

Yildirim, Deniz Umut; Ghobadi, Amir; Ozbay, Ekmel

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{
  "@context": "https://schema.org/", 
  "@id": 29067, 
  "@type": "ScholarlyArticle", 
  "creator": [
    {
      "@type": "Person", 
      "name": "Yildirim, Deniz Umut"
    }, 
    {
      "@type": "Person", 
      "name": "Ghobadi, Amir"
    }, 
    {
      "@type": "Person", 
      "name": "Ozbay, Ekmel"
    }
  ], 
  "datePublished": "2018-01-01", 
  "description": "Strong light-graphene interaction is essential for the integration of graphene to nanophotonic and optoelectronic devices. The plasmonic response of graphene in terahertz and mid-infrared regions enhances this interaction, and other resonance mechanisms can be adopted in near-infrared and visible ranges to achieve perfect light absorption. However, obtaining near-absolute polarization insensitivity with ultra-narrow absorption bandwidth in the visible and near-infrared regimes remains a challenge. In this regard, we numerically propose a graphene perfect absorber, utilizing the excitation of guided-modes of a dielectric slab waveguide by a novel sub-wavelength dielectric grating structure. When the guided-mode resonance is critically coupled to the graphene, we obtain perfect absorption with an ultra-narrow bandwidth (full-width at half-maximum) of 0.8 nm. The proposed design not only preserves the spectral position of the resonance, but also maintains >98% absorption at all polarization angles. The spectral position of the resonance can be tuned as much as 400 nm in visible and near-infrared regimes by tailoring geometrical parameters. The proposed device has great potential in efficient, tunable, ultra-sensitive, compact and easy-to-fabricate advanced photodetectors and color filters.", 
  "headline": "Near-absolute polarization insensitivity in grapheme based ultra-narrowband perfect visible light absorber", 
  "identifier": 29067, 
  "image": "https://aperta.ulakbim.gov.tr/static/img/logo/aperta_logo_with_icon.svg", 
  "license": "http://www.opendefinition.org/licenses/cc-by", 
  "name": "Near-absolute polarization insensitivity in grapheme based ultra-narrowband perfect visible light absorber", 
  "url": "https://aperta.ulakbim.gov.tr/record/29067"
}