Abstract

MANZANARES-MARTINEZ, J  and  RAMOS-MENDIETA, F. One-dimensional photonic crystals with semiconducting constituents: the effects of the absorption mechanisms. Rev. mex. fis. [online]. 2008, vol.54, suppl.2, pp.87-94. ISSN 0035-001X.

We have calculated the photonic band structure and the optical properties of two periodic layered systems, air/LiTaO₃ and air/InSb, with the dielectric constant of the semiconducting medium taking into account the phononic contributions. Intrinsic electron and hole densities are also considered for the InSb. In addition to the photonic gaps originated by the structural configuration and the dielectric contrast (gaps by diffraction), there exist photonic gaps of metallic (polaritonic) behavior that appear at two frequency regions, just above the transverse phononic frequency and below the effective plasma frequency. We have found that the absorption mechanisms give rise to inflexion points in some bands - the curve of dispersion returns without reaching the Billouin zone limit. An infinite concentration of non-dispersive bands is found below the polaritonic gap when the absorption is neglected. However, with realistic absorption such infinite series of flat bands disappears, giving place to a finite number of dispersive bands.

Keywords : Photonic band gap; polaritonic; photonic structure; semiconductor.

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