1 Ocak 2018 Dergi makalesi Açık Erişim

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

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  <dc:creator>Yildirim, Deniz Umut</dc:creator>
  <dc:creator>Ghobadi, Amir</dc:creator>
  <dc:creator>Ozbay, Ekmel</dc:creator>
  <dc:date>2018-01-01</dc:date>
  <dc: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 &gt;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.</dc:description>
  <dc:identifier>https://aperta.ulakbim.gov.trrecord/29067</dc:identifier>
  <dc:identifier>oai:zenodo.org:29067</dc:identifier>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>http://www.opendefinition.org/licenses/cc-by</dc:rights>
  <dc:source>SCIENTIFIC REPORTS 8</dc:source>
  <dc:title>Near-absolute polarization insensitivity in grapheme based ultra-narrowband perfect visible light absorber</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
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