Propagação de ondas eletromagnéticas em quasicristais de Kolakoski com grafeno
In this work, we simulate the incidence of electromagnetic waves in an one-dimensional photonic quasicrystal composed of multilayers following the Kolakoski sequence with graphene embedded at the interface between different media. The system is formed by the juxtaposition of two blocks of different...
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| Format: | doctoral thesis |
| Status: | Published version |
| Publication Date: | 2021 |
| Country: | Brasil |
| Institution: | Universidade Federal do Rio Grande do Norte (UFRN) |
| Repository: | Repositório Institucional da UFRN |
| Language: | Portuguese |
| OAI Identifier: | oai:repositorio.ufrn.br:123456789/47034 |
| Online Access: | https://repositorio.ufrn.br/handle/123456789/47034 |
| Access Level: | Open access |
| Keyword: | Física Quasicristais fotônicos Grafeno Sequência de Kolakoski |
| Summary: | In this work, we simulate the incidence of electromagnetic waves in an one-dimensional photonic quasicrystal composed of multilayers following the Kolakoski sequence with graphene embedded at the interface between different media. The system is formed by the juxtaposition of two blocks of different dielectric materials, A and B, with A being silicon dioxide, (SiO2) and B being titanium dioxide, (T iO2). Between the blocks A and B we insert layers of graphene. We used the Transfer Matrix Method, which simplifies the algebra involved, to perform the numerical calculation that generated the data analyzed in this work. Next, we present the objectives of this work: generate the necessary data to establish the transmission and reflection spectra, investigate the effects of the graphene monolayer and evaluate the effects of the quasiperiodicity on the physical behavior of the system. To do so, we impose variations on the following parameters of the system: angle of incidence, chemical potential of graphene, Kolakoski generation index and the type of electromagnetic propagation mode. The results obtained reveal that the presence of graphene reduces the transmissivity across the entire frequency range and also induces a band gap in the low frequency transmission. Furthermore, we observe that the band gap produced by graphene is omnidirectional and that its thickness increases with the increase of graphene’s chemical potential, which can be adjusted by the value of the electrical voltage. Furthermore, we identified frequency ranges that present Bragg band gaps. |
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