title: Control of optical mode properties in cross-slot waveguides.
abstract: A cross-slot waveguide geometry provides high confinement of the mode field of both fundamental quasi-TE and quasi-TM modes in geometrically perpendicular slots. A unique possibility to tailor optical mode characteristics such as effective index and confinement factor quite independently for the two polarizations with geometric and material parameters is shown. Nonbirefringent cross-slot geometries are presented. Fabrication related tolerances of the cross-slot geometry for low birefringence operation are studied. Means to externally tune the birefringence by a thermo-optic effect is also analyzed. Fabrication of a cross-slot waveguide test structure is demonstrated.
authors: Photonics Group, Department of Micro and Nanosciences, Helsinki University of Technology, Micronova, Tietotie 3, FI-02015 Espoo, Finland. amit.khanna@tkk.fi
authors: Amit
authors: A
authors: Khanna
authors: Antti
authors: A
authors: Säynätjoki
authors: Ari
authors: A
authors: Tervonen
authors: Seppo
authors: S
authors: Honkanen