Design and optimization of a high-efficiency nanoscale ±90° light-bending structure by mode selection and tailoring

摘要

We tailor the dispersive properties of a nanoscale structure to enable ±90° visible light-bending. The geometry and constituent materials of the structure are selected such that two low-loss modes are available to channel light toward and away from a nanoscale 90°-bend. Based on numerical simulations of visible light propagation through the structure, we propose an optimized geometry that yields maximum field overlap between the mode propagating toward and the mode propagating away from the 90°-bend, resulting in a peak bending efficiency of 92%.