Abstract: A waveguide structure (200) according to the invention comprises a core layer (210), a cladding layer (206) and a buffer layer (208). Sub-regions (204) are formed in the cladding layer (206) but not in the core layer (210). In one dimensional applications the sub-regions are slots: in two dimensional applications the sub-regions are rods. The rods or slots may be air-filled or filled with an in-fill material, (e.g. Si). The in-fill material, if present, enhances the contrast in dielectric constant between sub-regions (204) and the core layer (210).

Abstract: A prompting form-fill mechanism is provided which interactively populates data fields on electronic forms or other documents from prestored data fields. The first data field to be populated is determined and hi-lighted, then a user selects a prestored data field to copy into the first data field. The form-fill mechanism then automatically copies the information from one data field to the other. After populating the first data field, the form-fill mechanism hi-lights the next data field to be populated. This procedure is continued until all data fields are populated.

Abstract: An optical waveguide structure according to the invention comprises a core layer having a first refractive index ncore, an array of sub-regions within the core having a second refractive index nrods, the array of sub-regions giving rise to a photonic band structure within the core layer, and a cladding layer adjacent to the core layer having a refractive index ncladding, wherein:

Abstract: A waveguide structure according to the invention comprises a core layer (10), having a refractive index ncore, and an array of rods (11) in the core layer having a refractive index nrods.

Abstract: A waveguide structure according to the invention comprises a core layer (10), having a refractive index ncore, and an array of rods (11) in the core layer having a refractive index nrods The refractive indices satisfy the inequality