Band-structure properties of photonic superlattices |
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Authors: | S B Cavalcanti M de Dios-Leyva E Reyes-Gómez L E Oliveira |
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Institution: | (1) Instituto de Física, Universidade Fed. de Alagoas, Maceió-AL, 57072-970, Brazil;(2) Department of Theoretical Physics, Universcity of Havana, Vedado, 10400 Havana, Cuba;(3) Instituto de Física, Unicamp, CP 6165, Campinas, SP, 13083-970, Brazil |
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Abstract: | The band structure of a one-dimensional periodic array composed of two different layers of dimensions a and b characterized by refractive indices n
1 and n
2, respectively, is investigated. Refractive indices may take on positive as well as negative values. Within the Maxwell framework
and using a transfer matrix technique for one dimensional periodic eigen-problems, we have determined a general equation,
which governs the photonic band structure and the density of states (DOS) of one-dimensional photonic crystals. In addition
to the well-known existence of the band gaps, we show that, depending on the width relationship b/a between the layer materials, super-lattices with null photonic band gap may exist and the conditions for such occurrences
are established. Furthermore, we have been able to study the so-called 〈n〉 = 0 non-Bragg gap, ground ω0, for which the average refraction felt by the propagating radiation is null.
The text was submitted by the authors in English. |
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