The experimental investigation for the waveguide in 2D-3D hetero-structure

Abstract

Waveguide is an essential building block in large-scale optical integration equipment. And the 2D-3D hetero-structure, which includes two woodpile structures and one or two two-dimensional photonic crystals, is also important for the integrated circuits. In this paper, a waveguide in 2D-3D hetero-structure is designed, simulated, and measured in detail. According to the 2D-3D stacking characteristics, the influence of the woodpile structures located on both sides of the waveguide is considered. The waveguide is optimized by the translation and order adjustment method, respectively. The results show that the guide band can be improved when the woodpile structures are adjusted. Importantly, the ultra-wide guide band is observed when the order adjustment is considered. The guide band to mid-frequency ratio is equal to 23.69% when the dielectric constant is 11.9. The waveguide with an ultra-wide guide band can be used in the integrated circuits.