Optical Properties of GaAs/AlO $_{x}$ and Si/SiO $_{x}$ High Contrast Gratings Designed for 980-nm V

A 3-D, fully vectorial optical numerical model is used to design a high contrast grating for use as the top mirror of a 980-nm arsenide-based vertical-cavity surface-emitting laser. We study the parameters of two high contrast gratings made from GaAs/AlO_x and Si/SiO_x, respectively. Parameters providing high degrees of reflectivity, high levels of polarization discrimination, and fine tuning of the reflectivity of the high contrast grating are determined. The results demonstrate that both configurations if carefully designed by advanced numerical models can offer better performance in comparison to conventional distributed Bragg reflectors.