One dimensional graphene based photonic crystals: Graphene stacks with sequentially-modulated doping for photonic band gap tailoring
| Autor: | M. A. Palomino-Ovando, Ivan Fuentecilla-Carcamo, Felipe Ramos-Mendieta |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Graphene business.industry Band gap Superlattice Doping 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences law.invention Condensed Matter::Materials Science Optics law 0103 physical sciences Optoelectronics General Materials Science Electrical and Electronic Engineering 010306 general physics 0210 nano-technology Bilayer graphene Electronic band structure business Graphene nanoribbons Photonic crystal |
| Zdroj: | Superlattices and Microstructures. 112:46-56 |
| ISSN: | 0749-6036 |
| Popis: | In a periodic arrangement of equally-doped graphene monolayers the electromagnetic wave propagation is described by band theory. We have found that the photonic response of this system enriches when the doping level is sequentially-modulated acquiring periodic, quasi-periodic or harmonic profiles along the superlattice axis. Because the dielectric background that supports the graphene layers is homogeneous, it is the doping modulation superimposed on the graphene layers that produces a particular photonic band structure. We report that the fixed separation between the layers generates a persistent structural band gap which is tunable by gating. We also demonstrate that doping modulations following continuous cosine or semi-continuous square envelope functions give place to frequency mini-bands. In our calculations the doping levels correspond to chemical potentials within the range 0.2 eV |
| Databáze: | OpenAIRE |
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