title: Design and optimization of an achromatic photonic crystal bend.
abstract: We perform a simple sensitivity analysis of a W1 waveguide bend in a photonic crystal (PhC) where we use the information obtained to optimize the PhC bend's frequency response. Within a single optimization step we already achieve very low power reflection coefficients over almost the entire frequency range of the photonic bandgap (PBG), i.e., an achromatic bend. A further analysis shows that there is a single critical rod in the optimized bend structure that exhibits an extraordinary high sensitivity at a given frequency. Hence power reflection becomes tunable from 0 % up to 100 % involving only small changes in the critical rod's properties. This opens the door to novel topologies for compact switches and sensor applications.
authors.forename: Jasmin
authors.initials: J
authors.lastname: Smajic
authors.forename: Christian
authors.initials: C
authors.lastname: Hafner
authors.forename: Daniel
authors.initials: D
authors.lastname: Erni