Application Gallery

The tapered-waveguide-type polarization converter achieves efficient polarization conversion by enabling smooth energy coupling between different polarization modes through a gradually varying waveguide cross-section along the propagation direction. This structure offers advantages such as broad bandwidth, low loss, and high tolerance to fabrication errors, making it widely used in optical communications, polarization multiplexing, and polarization control in silicon photonic chips. In this example, the FDE solver is first used to sweep the waveguide width and analyze the variation of the effective refractive index of the TM1 and TE0 modes, identifying the region where the two modes intersect to guide the design range of the tapered waveguide. Subsequently, the FDTD solver is employed to perform a three-dimensional simulation of the entire structure to calculate the light propagation and polarization conversion efficiency within the tapered waveguide.

Wire grid polarizer(WGP) is a type of polarizer composed of a metallic grating with a sub-wavelength period and typically made of metals such as gold, silver, aluminum. Due to their advantages, including compact structure, high brightness, high polarization extinction ratio (PER), wide field of view, and ease of integration, WGPs can be widely applied in various fields such as photoswitches, optical displays, and imaging systems. This case is based on the work of Ahn et al. By controlling the grating spacing, duty cycle, and Al grating height, the extinction ratio and transmission optical characteristics can be adjusted.