Bandwidth engineering of photonic crystal waveguide bends

An effective design principle has been applied to photonic crystal waveguide bends fabricated in silicon-on-insulator material using deep UV lithography resulting in a large increase in the low-loss bandwidth of the bends. Furthermore, it is experimentally demonstrated that the absolute bandwidth range can be adjusted in a post-fabrication thermal oxidation process. Introduction: The planar photonic crystal waveguide (PhCW) has numerous potential applications because of its unique capability to control the propagation of light by utilising the photonic bandgap (PBG) effect [1, 2]. This effect allows the interaction between light and the PhCW to take place on a minute scale [3, 4]. Thereby, th