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Title: Omnidirectional band gaps in quasiperiodic photonic crystals in the THz region
Authors: Araújo, C.A.A.
Vasconcelos, Manoel Silva de
Mauriz, Paulo Wilson
Albuquerque, Eudenilson Lins de
Keywords: Photonic crystals;Quasiperiodic structures;Metamaterials;Omnidirectional band gaps
Issue Date: 2012
Publisher: Elsevier
Citation: ARAÚJO, C.A.A.; VASCONCELOS, M.S.; MAURIZ, P.W.; ALBUQUERQUE, E.L.. Omnidirectional band gaps in quasiperiodic photonic crystals in the THz region. Optical Materials, [s.l.], v. 35, n. 1, p. 18-24, nov. 2012. Disponível em: Acesso em: 08 Set. 2020.
Portuguese Abstract: In this work we calculate the emittance spectra of the electromagnetic radiation normally and obliquely incident (s- and p-polarized modes) on a one-dimensional multilayer quasiperiodic photonic structure made up by layered system of positive (SiO2) and negative (LiTaO3) refractive index materials organized in a quasiperiodic (Fibonacci-like) fashion. We model the negative refractive index material by an effective medium, whose electric permittivity ϵ(ω) is characterized by a phonon-polariton frequency dependent dielectric function, while for the magnetic permeability μ(ω) we have a Drude-like frequency-dependent function. The emittance spectra are determined by means of a well known theoretical model based on Kirchoff’s second law, together with a transfer matrix formalism. Our results shows that the omnidirectional band gaps appear in the THz regime, in well defined frequency intervals independently of the electromagnetic radiation’s polarized modes
ISSN: 0925-3467
Appears in Collections:CB - DBF - Artigos publicados em periódicos
ECT - Artigos publicados em periódicos

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