Effects of graphene on light transmission spectra in Dodecanacci photonic quasicrystals
| Autor: | Carlos H. Costa, E.F. Silva, V.D. Mello, M. S. Vasconcelos, D.H.A.L. Anselmo |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Band gap 02 engineering and technology 010402 general chemistry 01 natural sciences Spectral line law.invention Inorganic Chemistry law Transmittance Electrical and Electronic Engineering Physical and Theoretical Chemistry Spectroscopy business.industry Graphene Organic Chemistry Quasicrystal 021001 nanoscience & nanotechnology Polarization (waves) Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Optoelectronics Photonics 0210 nano-technology business Visible spectrum |
| Zdroj: | Optical Materials. 98:109450 |
| ISSN: | 0925-3467 |
| DOI: | 10.1016/j.optmat.2019.109450 |
| Popis: | We make a theoretical study of light waves, for both TE and TM polarization with oblique incidence. The light waves propagate on SiO2/TiO2 multilayers, organized by Dodecanacci sequence, where we consider a graphene monolayer at the interfaces between distinct layers. We also calculate numerically the optical transmissivity spectrum, by using the transfer matrix method, for the cases with a graphene sheet and without a graphene sheet at the interfaces. Our results indicate that the whole optical spectrum becomes affected by the presence of graphene in the interfaces. Among these effects, we can highlight the shift of bandgaps to high-frequency regions, the emergence of a graphene induced bandgap at low-frequency regions, and the decreasing of transmittance in the whole frequency range considered here. The self-similarity, which is a property that indicates a fractal spectrum, keeps essentially unchanged when we consider graphene sheets between the layers. Our studies can be applied to electromagnetic filters, where an input gate voltage, applied on the graphene sheets, can control the bandgaps which arise on these structures. |
| Databáze: | OpenAIRE |
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