Origin of the super-enhanced light transmission through a 2-D metallic annular aperture array: a study of photonic bands
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- Baida, F., Van Labeke, D., Granet, G. et al. Appl. Phys. B (2004) 79: 1. doi:10.1007/s00340-004-1497-3
Recently a new structure showing a super-enhanced transmission [Optics Commun. 209, 17–22 (2002); Phys. Rev. B, 67, 155314, (2003)] has been proposed. The origin of this phenomenon was not clearly explained. In this paper, by using a numerical Order-N FDTD spectral method, we study the eigenmodes, the band structure and the dispersion curves of a photonic 2-D crystal made with coaxial circular cavities and made from a real metal. We show that the super-enhanced transmission of the finite structure is due to a cavity resonance of a single guided mode. An extensive characterization of this mode is presented, in terms of the spatial mode structure and effective index dispersion curve.