Modeling of experimental reflectance for porous silicon multilayers

This work exposes a computational simulation method to describe the infrared reflectance on periodical and effective media. We use this method in order to improve the parameters to design porous silicon multilayers (PSM). The procedure of the computer program takes into account the complex refractive index of each layer by using the effective dielectric constant for different porosities. The lateral inhomogeneity of the thickness for the successive layers are simulated using the thickness as a random function around one mean value. Averaging all the reflectance values and iterating the computational process for different random parameters gives the reflectance results of the model. We also show in this work the experimental reflectance spectrum for a PSM dielectric Bragg reflector. The comparison of the experimental spectrum and the simulations shows a good agreement in bandwidth and position of the maximum reflectance band.