title: Genetic optimization of photonic crystal waveguide termination for both on-axis and off-axis highly efficient directional emission.
abstract: 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.
authors.affiliation: Department of Physics, Nanjing University of Science and Technology, Nanjing, China. jalyca0510@yahoo.com.cn
authors.forename: Liyong
authors.initials: L
authors.lastname: Jiang
authors.forename: Haipeng
authors.initials: H
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Jia
authors.forename: Xiangyin
authors.initials: X
authors.lastname: Li
authors.forename: Zexiang
authors.initials: Z
authors.lastname: Shen
mesh_terms: D017076:Computer-Aided Design; D003460:Crystallization / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008420:Manufactured Materials; D017785:Photons; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity