| Description |
viii, 68 leaves : illustrations ; 29 cm |
| Summary |
"This research is a study conducted on the excitation of whispering gallery modes (WGM) in small micron-scale glass spheres. Optical WGM may be represented by a light wave that propagates along the surface of the sphere and reaches back itself in phase at specific wavelengths. Due to this, very high intensities of light with narrow line widths circulate in the microspheres contributing to high Q factor. The evanescent field of an optical waveguide is used to resonantly stimulate the WGM. The WGM excitation in fused silica spheres was demonstrated in the laboratory with 60% coupling efficiency. Tapered optical fibers were initially used as the coupling mechanism. The long period fiber grating (LPFG) is suggested as an alternate coupling mechanism. The problems in using LPFG with fused silica spheres were theoretically and experimentally verified. This principle was also applied to characterize the optical losses in high refractive index beads. The glass beads exhibit enhanced IR retro-reflectivity which fins application in IR tagging and identification. This thesis provides a detailed study of all these aspects with relevant experimental data to support them"--Abstract, leaf iii. |
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