Terahertz response of patterned epitaxial graphene

We study the interaction between polarized terahertz (THz) radiation and micro-structured large-area graphene in transmission geometry. In order to efficiently couple the radiation into the two-dimensional material, a lateral periodic patterning of a closed graphene sheet by intercalation doping into stripes is chosen. We observe unequal transmittance of the radiation polarized parallel and perpendicular to the stripes. The relative contrast, partly enhanced by Fabry-Perot oscillations reaches 20 %. The effect even increases up to 50 % when removing graphene stripes in analogy to a wire grid polarizer. The polarization dependence is analyzed in a large frequency range from < 80 GHz to 3 THz, including the plasmon-polariton resonance. The results are in excellent agreement with theoretical calculations based on the electronic energy spectrum of graphene and the electrodynamics of the patterned structure

Estudo palinostratigráfico dos sectores Martinlongo-Vaqueiros e Malhadinha da Faixa Piritosa Ibérica: enquadramento geológico e paleogeográfico

Dissertação de mestrado em Geociências (área de especialização em Valorização de Recursos Geológicos)

Nanocellulose in biomedical area: brief review

Due to remarkable physical properties, special surface chemistry and excellent biological properties, as low toxicity, biocompatibility and biodegradability, nanocellulose has gained much attention for its use as biomedical material, applied in medical implants, tissue engineering, drug delivery, wound-healing, cardiovascular applications, among others. This paper presents a review on nanocellulose applied in biomedical area.

Simulação numérica do comportamento ao impacto de componentes metálicos para aplicações de crashworthiness utilizando iniciadores de deformação configuráveis

Dissertação de mestrado integrado em Engenharia Mecânica

Development of composite auxetic structures for civil engineering applications

Tese de Doutoramento em Engenharia Têxtil

Noise mapping for an urban area: study case: old city of Damascus, Syria

Dissertação de mestrado em Engenharia Urbana