الفهرس | Only 14 pages are availabe for public view |
Abstract In this thesis, optical characterization of materials having different dimensions and structural shapes is performed. The thesis is divided into two parts. Chapter (1) presents a technical modification of the traditional Mach-Zehnder interferometer by inserting two linear polarizers and a wave rotator in the light’s path. The modified interferometer enables simultaneously obtaining two shifts (double image) corresponding to two orthogonal states of vibration of linearly polarized laser; i.e. parallel (extraordinary) and perpendicular (ordinary) with respect to the fibre’s axis In chapter (2), the modified Mach-Zehnder interferometer is used to investigate anisotropic textile polypropylene fibres at different temperatures (26 oC- 80 oC) using both normal interferometry and digital holographic techniques. In chapter (3), the lens-fibre interferometer (LFI) is revisited. It is used here to monitor the variations of a transparent sheet thickness. The sheet is inserted in the path of the interfered rays to produce a geometrical shift (and hence a phase shift). Chapter (4) presents an introduction about nanoparticles, their methods of crystallization and assembly in monolayers. In chapter (5), polymeric hard-core/soft-shell colloidal nanoparticles are used to prepare Langmuir monolayers at the air/water interface. The monolayer is in-situ (on water surface) characterized using Brewster angle microscopy while the substrate-supported monolayers are characterized using both optical microscopy and atomic force microscopy. |