Quasi-Periodic Bragg Structures with Thin Lossy Layers

by UnboltSoft
Quasi-Periodic Bragg Structures with Thin Lossy Layers

The behavior of quasi-periodic and nonperiodic (chirp) Bragg structures with thin lossy layers has been considered. In order to calculate the dependence of the reflection coefficient against frequency, transmission matrix method was used. A deep minimum of reflection coefficient for any frequency is implemented by proper choice of the thickness of the last thin film and its optical distance to the substrate. The possibility of providing broadband reflection by nonperiodic structures has been offered. Quasi-periodic Bragg structures with thin lossy layers can operate as good absorbers in given frequency band. Variation of the conductivity of a lump inhomogeneity is obtained by varying the thickness of a thin lossy layer. For a fixed frequency minimum reflectivity can be provided by choice of the parameters of layer thickness and the distance to the substrate. Broadband absorption is achieved by nonuniform perturbation of optical thickness of the separating dielectric layer.

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