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Journal of Applied Physics / Volume 100 / Issue 2 / LASERS, OPTICS, AND OPTOELECTRONICS

J. Appl. Phys. 100, 023119 (2006); http://dx.doi.org/10.1063/1.2216878 (5 pages)

Transmission properties of perturbed optical Cantor multilayers

Francesco Chiadini1, Antonio Scaglione1, and Vincenzo Fiumara2

1Department of Electrical and Information Engineering, University of Salerno, via Ponte don Melillo 1, 84084 Fisciano (Sa), Italy
2Department of Environmental Engineering and Physics, University of Basilicata, viale dell’Ateneo Lucano 10, 85100 Potenza, Italy

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(Received 1 December 2005; accepted 18 May 2006; published online 27 July 2006)

Fractal multilayers of two distinct dielectric materials are structures exhibiting stop bands and transmission peaks in their electromagnetic response. In this work we analyze how the transmission spectrum of a Cantor fractal multilayer changes when a defect, consisting of a dielectric layer different from those constituting the multilayer, is inserted midway through its thickness. Unlike a periodic multilayer structure, no transmission peaks (defect modes) appear in the stop band by inserting a defect in a Cantor multilayer. We show that a defect in the fractal structure results in a frequency shift of its transmission spectrum and in a change of the width of both stop bands and transmission peaks. The extent of such spectrum modifications depends on either the thickness and the refractive index of the defect layer. By suitably modulating these parameters a tunable narrow band filter can be realized to cover a desired range of frequency. This feature may hold attraction for certain applications such as dense wavelength division multiplexing systems and sensors.

© 2006 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. CANTOR FRACTAL MULTILAYERS
    1. Triadic Cantor fractals
    2. Optical triadic Cantor multilayers
    3. Transmissivity spectrum of optical Cantor multilayers
  3. PERTURBED CANTOR FRACTAL MULTILAYERS
  4. CONCLUSIONS

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KEYWORDS and PACS

Keywords

optical multilayers, dielectric materials

PACS

  • 78.67.Pt

    Multilayers; superlattices; photonic structures; metamaterials

  • 77.84.-s

    Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials

  • 42.70.-a

    Optical materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2216878

PUBLICATION DATA

ISSN

0021-8979 (print)  
1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    A. Figotin and V. Gorentsveig, Phys. Rev. B 58, 180 (1998).

    H. Nemec, L. Duvillaret, F. Garet, P. Kuzel, P. Xavier, J. Richard, and D. Rauly, J. Appl. Phys. 96, 4072 (2004)JAPIAU000096000008004072000001.


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