Open AccessGenetic optimization of photonic crystal waveguide termination for both on-axis and off-axis highly efficient directional emission
Author(s) -
Liyong Jiang,
Haipeng Li,
Wei Jia,
Xiangyin Li,
Zexiang Shen
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.010126
Subject(s) - optics , waveguide , photonic crystal , interference (communication) , detector , surface (topology) , optical axis , physics , materials science , computer science , telecommunications , geometry , lens (geology) , channel (broadcasting) , mathematics
In this work, we use the finite-difference time-domain method in conjunction with a genetic algorithm (GA) to design a photonic crystal waveguide with gratinglike surface added for highly-efficient directional emission. By placing a detector at different locations in the output field, we have obtained both on-axis and off-axis highly-efficient directional emission designs with the help of GA. The interference of light emitted from the outlet of waveguide and surfaces modes in gratinglike surface is believed to account for the directional beaming effect in our designs.