Optical properties of a dielectric-metallic superlattice: The complex photonic bands

D. Soto-Puebla*, M. Xiao, F. Ramos-Mendieta

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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We have studied theoretically the photonic bands in a periodic dielectric-metallic superlattice. In the calculations the absorption in the metallic layers was taken into account using the well-known Drude model for the dielectric function, ε(ω)=1-ωp2/ ω(ω+iγ). Due to the absorption in the metallic films, the Bloch vector becomes complex for all frequencies, and the waves are evanescent. The photonic band structure is strongly modified as compared to the band structure of the nonabsorbent superlattice, mainly in the region of low frequencies ω<ωp where bands of odd behavior appear. We also have studied the absorption, reflection and transmission spectra of light incident on a finite superlattice. The spectra show that the complex bands, with complex wave vector and real frequency, are an appropriate resource to describe the optical properties of periodic absorbent structures.

Original languageEnglish
Pages (from-to)273-280
Number of pages8
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Issue number3-4
StatePublished - 7 Jun 2004

Bibliographical note

Funding Information:
This work was supported by Consejo Nacional de Ciencia y Tecnologı́a, CONACyT México, Grant No. 489100-5-3554-E. D.S.P. is grateful to CONACyT and PROMEP (Programa de Mejoramiento del Profesorado de la Secretarı́a de Educación Pública, México) for support.


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