Investigations on Grating-Enhanced Waveguides for Wide-Angle Light Couplings.

ABSTRACT: As a universal physical scheme, effective light couplings to waveguides favor numerous applications. However, the low coupling efficiency at wide angles prohibits this fundamental functionality and thus lowers the performance levels of photonic systems. As previously found, the transmission gratings patterned on waveguide facets could significantly improve the large-angle-inputted efficiency to the order of 10-1. Here, we continue this study with a focus on a common scenario, i.e., a grating-modified waveguide excited by the Gaussian beam. A simplified 2D theoretical model is firstly introduced, proving that the efficiency lineshape could be well flattened by elaborately arranged diffractive gratings. For demonstration, subsequent explorations for proper grating geometries were conducted,

SUBMITTER: Gu Y 

PROVIDER: S-EPMC9698350 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature