Near-absolute polarization insensitivity in grapheme based ultra-narrowband perfect visible light absorber.

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 wi

SUBMITTER: Yildirim DU 

PROVIDER: S-EPMC6185963 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature