Form birefringence and third-harmonic generation in nanostructured silicon oxide

In this paper, a network of preferentially oriented pores in silicon oxide exhibiting the form anisotropy of optical and nonlinear optical properties is demonstrated. The oxidized porous silicon (OPS) birefringence is enough to compensate for the material dispersion of this material and achieve the phase-matched TH generation. The OPS form birefringence is the subject of this research study, which explores the unique properties of OPS both for linear and nonlinear optical applications. The birefringence plays the essential role in the processes of the optical third-harmonic (TH) generation, allowing its phase matching, which results in its much higher efficiency.