| Full text | |
| Author(s): |
Total Authors: 3
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| Affiliation: | [1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, BR-14040901 Sao Paulo - Brazil
[2] Natl Inst Sci & Technol Complex Syst, BR-22290180 Rio De Janeiro - Brazil
[3] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro - Brazil
Total Affiliations: 3
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| Document type: | Journal article |
| Source: | JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION; v. 32, n. 5, p. 943-948, MAY 2015. |
| Web of Science Citations: | 9 |
| Abstract | |
We investigate electromagnetic scattering and absorption by dielectric cylinders coated with a concentric plasmonic shell at arbitrary incidence angles. Exploiting bulk and surface plasmon resonances in the long wavelength regime, we obtain an analytical condition to achieve wide-angle enhanced absorption for both TE and TM polarizations. By using the Lorenz -Mie theory, we apply this result to investigate electromagnetic absorption in a silicon cylinder coated with a graphene monolayer epitaxially grown on silicon carbide. Our theoretical results show that enhanced absorption occurs for a broad frequency range in the terahertz, and that omnidirectional absorption exists at a frequency in between the bulk and localized surface plasmon resonances. By showing that omnidirectional absorption does not correspond to an extinction resonance, we associate this phenomenon with off-resonance field enhancement in this system, which in turn is explained in terms of Fano resonances in the graphene layer. (C) 2015 Optical Society of America (AU) | |
| FAPESP's process: | 10/10052-0 - Internal energy and electromagnetic wave scattering by spheres or cylinders: Fano resonances and their applications to metamaterials |
| Grantee: | Tiago José Arruda |
| Support Opportunities: | Scholarships in Brazil - Doctorate |