High transmission in 120-degree sharp bends of inversion-symmetric and inversion-asymmetric photonic crystal waveguides.

ABSTRACT: Bending loss is one of the serious problems for constructing nanophotonic integrated circuits. Recently, many works reported that valley photonic crystals (VPhCs) enable significantly high transmission via 120-degree sharp bends. However, it is unclear whether the high bend-transmission results directly from the valley-photonic effects, which are based on the breaking of inversion symmetry. In this study, we conduct a series of comparative numerical and experimental investigations of bend-transmission in various triangular PhCs with and without inversion symmetry and reveal that the high bend-transmission is solely determined by the domain-wall configuration and independent of the existence of the inversion symmetry. Preliminary analysis of the polarization distribution indicates that high

SUBMITTER: Dai W 

PROVIDER: S-EPMC11742423 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature