1 Ocak 2018 Dergi makalesi Açık Erişim

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

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  <identifier identifierType="URL">https://aperta.ulakbim.gov.tr/record/29067</identifier>
  <creators>
    <creator>
      <creatorName>Yildirim, Deniz Umut</creatorName>
      <givenName>Deniz Umut</givenName>
      <familyName>Yildirim</familyName>
    </creator>
    <creator>
      <creatorName>Ghobadi, Amir</creatorName>
      <givenName>Amir</givenName>
      <familyName>Ghobadi</familyName>
    </creator>
    <creator>
      <creatorName>Ozbay, Ekmel</creatorName>
      <givenName>Ekmel</givenName>
      <familyName>Ozbay</familyName>
    </creator>
  </creators>
  <titles>
    <title>Near-Absolute Polarization Insensitivity In Grapheme Based Ultra-Narrowband Perfect Visible Light Absorber</title>
  </titles>
  <publisher>Aperta</publisher>
  <publicationYear>2018</publicationYear>
  <dates>
    <date dateType="Issued">2018-01-01</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://aperta.ulakbim.gov.tr/record/29067</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1038/s41598-018-33609-2</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://www.opendefinition.org/licenses/cc-by">Creative Commons Attribution</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">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 &amp;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.</description>
  </descriptions>
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