Polarization Effects Analysis in Tilted Subwavelength Periodical Waveguides

Birefringence properties have been frequently achieved when subwavelength elements are used on waveguides or devices design and construction. In order to investigate this effect in details we analyze a tilted silicon-on-insulator periodically subwalength waveguides composed of nanowires. The propagation properties are obtained by an efficent frequency domain finite element approach wich takes into accout the periodical boundary conditions The dispersion properties of the waveguides are analyzed in details for several values of duty cycle, nanowires shape and tilting angles. We demonstrate that the resulting birefringence can be tailored by changing the structural parameters of the waveguides. The tilted nanowire based waveguide can work as a birefringent waveguide depending on the propagating polarization, an essential and important condition for a myriad of photonics circuit devices.