The modulation of photonic band structures of silicon carbide polytype multilayers applicable in optical wave-guiding devices.

In this study, we report photonic band structures and optical transmissions of some SiC polytypes, such as 3C, 2H, 4H, and 6H, and their multilayers, which have the form of a hexagonal photonic crystal at two-dimensional (2D) scale. Through the finite-difference time-domain computational simulations, we found that spatial electric-field variations of electromagnetic waves depend on the radius of dielectric rods of the multilayer crystal structure, and the central structural geometry of 4H- and 6H-SiC hexagonal polytypes was found to cause a remarkable increase of the wave vector k in x and y directions. We also found a correlation between the local central structures of the optical modes in the 2D hexagonal crystal of 4H- and 6H-SiC polytypes. The wave-guiding in 4H- and 6H-SiC polytypes in the central core of the model geometry enabled the integration of defects to achieve a wide spectrum of technological functionalities, such as devices with striking features for miniaturized sensors and quantum information processing. [ABSTRACT FROM AUTHOR]