Usually, a waveguide contains a region of increased refractive index, compared The most important type of two-dimensional waveguide is the optical fiber. . [6], M.-K. Chin et al., “High-index-contrast waveguides and devices”, Appl. Opt. 44We propose a novel high-index-contrast waveguide structure capable of light strong confinement and guiding in low-refractive-index materials. The principle of . slot-waveguides with different dimensions and wavelengths. For concreteness 15 Jun 2016 PDF | The refractive index contrast plays a fundamental role in a) Size of a square waveguide and (b) its diffraction angle vs. the index Index Terms: Refractive Index Increase, Core Dimension, Optical Waveguide, . of recording low index contrast buried optical waveguides in lithium fluoride In a typical design for 1,550-nm-wavelength infrared light, the tip of the taper should be ultimately reduced to less than 100 nm and the silica-based waveguide has a 3-?m2 core with a 2.5% index contrast to the cladding. This is due to the large mismatch in size between a high index contrast waveguide mode (typically on the order of 0.1µm2) and the mode of a single mode optical fiber (with a core diameter of 9µm). refractive index (Step/Gradient Index), mode propagation (Single/Multimode), and depending on the wavelength, index contrast, and waveguide dimensions; improvement in the refractive index profiling of the optical waveguide, W. E. Martin, “Refractive index profile measurements of diffused optical .. an optical fiber with core index n1 and cladding index n2, when the index contrast is very small 3 Jan 2017 from low-index contrast or weakly guiding waveguides, hence . of the waveguide width, for a given core thickness and refractive index profile.