Abstract
Graphene derivatives, possessing strong Raman scattering and near-infrared absorption intrinsically, have boosted many exciting biosensing applications. The tunability of the absorption characteristics, however, remains largely unexplored to date. Here, we proposed a multilayer configuration constructed by a graphene monolayer sandwiched between a buffer layer and one-dimensional photonic crystal (1DPC) to achieve tunable graphene absorption under total internal reflection (TIR). It is interesting that the unique optical properties of the buffer-graphene-1DPC multilayer structure, the electromagnetically induced transparency (EIT)-like and Fano-like absorptions, can be achieved with pre-determined resonance wavelengths, and furtherly be tuned by adjusting either the structure parameters or the incident angle of light. Theoretical analyses demonstrate that such EIT- and Fano-like absorptions are due to the interference of light in the multilayer structure and the complete transmission produced by the evanescent wave resonance in the configuration. The enhanced absorptions and the huge electrical field enhancement effect exhibit potentials for broad applications, such as photoacoustic imaging and Raman imaging.
Highlights
Two-dimensional materials have been intensely investigated for their wide applications in biomedicine.[1,2]Specically, the unique properties of graphene have enabled applications in numerous technological areas
Tunable optical absorption in the near-infrared regime and multi-wavelength operation is desired in graphene-based devices[19,20]; the tunability and multi-wavelength operation allow good match with the laser sources of di®erent wavelengths, while the resultant electricaleld enhancement at desired position can be applied for surface-enhanced Raman scattering (SERS)-based biosensing.[21]
We propose a conguration of a graphene monolayer sandwiched between a bu®er layer and 1DPC multilayer
Summary
Two-dimensional materials have been intensely investigated for their wide applications in biomedicine.[1,2]Specically, the unique properties of graphene have enabled applications in numerous technological areas. The transmission and the re°ection of the whole structure are separately engineered to be zero based on the TIR and destructive interference experienced by the re°ected light at all layer interfaces,[23] and the position of the broadband absorption peak can be optimized with the help of the transfer matrix method.[24] As for \Atom 2", the
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