Transmission spectrum of a dielectric binary multilayered structure with diluted disorder

  • Ribeiro A
  • Nascimento E
  • Lyra M
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Abstract

In this work we investigate the transmission properties of a binary multilayered structure with diluted disorder. This system consists of two interpenetrating sub-sequences. One of them is composed by layers of refractive index naand thickness da, inserted into the odd positions of a stack. The second sub-sequence consists of randomly distributed layers of type A and B, distributed with probability 1 - p and p, respectively and inserted into the even sites of the stack. The layer thicknesses were taken to satisfy the Bragg condition nada= nbdb. Using a transfer matrix method, we compute the transmission spectrum, the frequency averaged transmission as a function of the system size and the reduced Lyapunov coefficient for different values of the defect concentration p. For 0 < p < 1 the system depicts a wide band-gap due to the Anderson localization of the electromagnetic modes promoted by the underlying disorder. However, the diluted character of the disorder implies in the absence of the quarter-wavelength resonant mode within the band-gap that usually appears in random binary structures. This particular feature suggests that binary dielectric structures with diluted disorder shall perform better as a wide band-gap filter than uncorrelated disordered multilayer structures. © 2012 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Anderson localization
  • Dielectric multilayers
  • Diluted disorder
  • Wide band-gap

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