Enhanced absorption of graphene with one-dimensional photonic crystal

Abstract

The optical absorption of graphene layers prepared on top of a one-dimensional photonic crystal (1DPC) is investigated theoretically. The absorption of graphene with 1DPC is enhanced greatly over a broad spectral range due to photon localization. The absorption of graphene can also be tuned by varying either the incident angle or the distance between the graphene and the 1DPC. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4740261]NSFC [10904059, 10904016, 11104232]; NSF from the Jiangxi Province [2009GQW0017]; Fujian Innovation Fund [2009J05006

Absorption enhancement and total absorption in a graphene-waveguide hybrid structure

“…15 However in the visible to near-IR spectrum, wave vector mismatch between graphene SPPs and vacuum light is very large and difficult to compensate, and graphene SPPs can not be excited, very high doping levels or small sized nanostructures are always required 16 which are difficult to realize. Thus extra resonant structures are usually utilized together with monolayer graphene in this spectrum, including Fabry-Perot cavity, 17,18 photonic crystals, 19,20 SPPs of metals 21,22 and critical coupling. 23 While enhanced or total absorption of monolayer graphene has been studied in several works, new structures which can be easily fabricated, robust and have high absorption in a wide spectrum, are always pursued and still need further investigation.…”

Enhanced Light–Matter Interactions in Graphene-Covered Gold Nanovoid Arrays

“…6 However, all such devices suffer from the inherently weak interaction between pristine graphene and light (2.3% light absorption at normal incidence), therefore imposing substantial challenges and restrictions for many electro-optical and all-optical applications. 7,8 Doped graphene nanostructures which support surface plasmons in the teraherz and infrared regions offer an exciting route to increase the light-graphene interaction by confining the optical fields below the diffraction limit. [9][10][11][12][13] However, graphene is less attractive when the interband loss becomes large, and it effectively mimics a dielectric material in the visible and near-infrared frequencies.…”

The tuned absorptance in multilayer graphene-dielectric structures by intraband transition

“…The tunable optical reflectivity, transmissivity, and absorptivity have been investigated in many graphene-based systems, such as graphene nanodisc arrays, 11,12 graphene nanoribbons, 13 alternating dielectric media with graphene layers sandwiched between them, [14][15][16] graphene-based Salisbury screens, 17 stacked graphene pairs or graphene photonic crystals, etc. [18][19][20][21][22] In a multilayer structural system, the optical transport properties and transmission are dependent on the number of dielectric and graphene layers, the dielectric space thickness, the incident angle, the incident light wavelength (or frequency) which is located in different graphene intraand/or inter-band optical transition regions, the surface plasmon-polaritons, and the transverse electric/transverse magnetic (TE/TM) modes. So many factors can be used to tune the optical properties of graphene-based dielectric structure systems which can meet the requirements of optoelectronic applications.…”

“…16 The influence of a nonzero mass-gap on the reflectivity properties has also been investigated at both zero and nonzero temperatures in graphene. 23 When graphene is embedded between two dielectric layers, the graphene layer can be treated as a homogeneous medium with an effective thickness 20,24 or as a boundary with the interface conductivity. 14 At the interface between different dielectric layers, the electric and magnetic fields satisfy the boundary conditions.…”