STUDY OF THE OPTICAL REFLECTION PROPERTIES

OF QUASI-PERIODIC ONE-DIMENSIONAL

DIELECTRIC PHOTONIC BANDGAP STRUCTURES

M. Kanzari*, B. Rezig

Laboratoire de Photovoltaïque & Matériaux Semiconducteurs - ENIT BP 37, Le Belvédère, 1002 – Tunis, Tunisia

* Corresponding author. E-mail : Mounir.Kanzari@ipeit.rnu.tn

Received: 04 December 2002; revised version accepted : 14 April 2003

Abstract

The Reflection properties at normal incidence of quasi-periodic Cantor like and Fibonacci photonic band structures that have the same optical paths are studied and compared with one dimensional, finite, N period stack and a "chirped" structure. We show that the structure builds according to the pattern of Cantor discontinium exhibits the best performance as an interferential mirror. Therefore, we investigate the impact of different parameters at normal incidence on the reflections properties. The parameters investigated are: the number of iteration N, the homothetic ratio m and the ratio nH/nL, where nH and nL are the refractive indices of the two layers types H (high indices) and L (low indices) which are arranged in Cantor sequence.

Keywords: Photonic band gaps; Mirror dielectric; Quasi-periodic structures.

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