The role of the aging in the photoluminescence (PL) of stain etched porous silicon (PS) layers and its behaviour at
different temperatures have been studied. The photoluminescence has been measured at different temperatures showing
the influence of the phonons in the intensity of the emissions and the lifetimes. Two contributions to the
photoluminescence spectra have been found: one due to quantum confinement effects and the other one due to the
presence of non-bridging oxygen hole centre defects. There is no evidence of energetic shifts on the maximum at
different temperatures.
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.
The high-accuracy universal polarimeter (HAUP) uses a technique (HAUP method) for simultaneous measurement of optical anisotropy (birefringence, optical activity, rotation of optical indicatrix, dichroism, electro-optic coefficients,...) of crystals. The HAUP method has been applied to determining linear birefringence and optical activity of Quartz as a function of temperature in the range 25-300 °C at 632.8 nm of wavelenght. The measurements are affected by modulation in the fitted parameters of HAUP method and optical properties when the sample temperature is changed. This effect can be explained by the multiple reflections within the slab that give rise to a temperature-dependent interference pattern. The same effect has been observed in Lithium Niobate and Calcite samples of great plane-parallelism. Good agreement was found between our experimental values and the HAUP method equations in the presence of multiple reflections.
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