The tuning of light-matter coupling and dichroism in graphene for enhanced absorption: Implications for graphene-based optical absorption devices

Abstract

The inter-band optical absorption in graphene characterized by its fine-structure constant has a universal value of 2.3\% independent of the material parameters. However, for several graphene-based photonic applications, enhanced optical absorption in graphene is highly desired. In this work, we quantify the tunability of optical absorption in graphene via the Fermi level in graphene, angle of incidence of the incident polarized light, and the dielectric constant of the surrounding dielectric media in which graphene is embedded. The influence of impurities adsorbed on the surface of graphene on the Lorentzian broadening of the spectral function of the density of states is analytically evaluated within the equilibrium Green's function formalism. Finally, we compute the differential absorption of right and left circularly-polarized light in graphene that is uniaxially and optically strained. The preferential absorption or circular dichroism is investigated for armchair and zigzag strain.

12 pages, 11 figures

References in corpus (20)

• The electronic properties of graphene
• Ultrahigh electron mobility in suspended graphene
• Boron nitride substrates for high-quality graphene electronics
• Valley polarization in MoS2 monolayers by optical pumping
• Doping graphene with metal contacts
• Graphene photodetectors for high-speed optical communications
• Substrate-induced band gap opening in epitaxial graphene
• Uniaxial Strain in Graphene by Raman Spectroscopy: G peak splitting, Gruneisen Parameters and Sample Orientation
• Dielectric function, screening, and plasmons in 2D graphene
• Electronic States of Graphene Nanoribbons
• Valley Dependent Optoelectronics from Inversion Symmetry Breaking
• Weak localisation magnetoresistance and valley symmetry in graphene
• Defect scattering in graphene
• A Primer on Surface Plasmon-Polaritons in Graphene
• Tuning of energy levels and optical properties of graphene quantum dots
• Optical Properties of Strained Graphene
• Dielectric function and plasmons in graphene
• Theory of charged impurity scattering in two dimensional graphene
• Hexagonal warping on spin texture, Hall conductivity and circular dichroism of Topological Insulator
• The influence of proximity induced ferromagnetism, superconductivity and Fermi-velocity on evolution of Berry phase in Bi${}_2$Se${}_3$ topological insulator

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• Low-energy theory for strained graphene: an approach up to second-order in the strain tensor
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• Anomalous photo-thermal effects in multi-layered semi-Dirac black phosphorus