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Abstract Chalcogenide glasses have been widely studied for their various and unique optical properties which make them very promising materials for use in optical and micro-optical elements such as gratings, optical recording media, fibre optics and waveguided devices in integrated optics since they exhibit a good transparency in the infrared region, especially at the telecommunication wavelengths at 1.30 and 1.55 μm. The purpose of this thesis is to study the structural and optical properties of Se80Te20-xSnx (where x= 3, 6, 9, 12 and 15 at. %) thin films. The amorphous materials of bulk samples of the Se80Te20-xSnx glasses were prepared by the usual melt-quenching technique. The films of the Se80Te20-xSnx glasses were deposited on to ultrasonically cleaned glass substrates by thermal evaporation technique under vacuum of 10-5 Torr. Chapter 1: gives an introduction of the present work and literature review of the previous work. Chapter 2: gives the theoretical approaches to the present work. Chapter 3: present some details of sample preparation, vacuum evaporation techniques, characterization of samples, such as structural, electrical and optical properties. Chapter 4: presents physical behavior of Se-Te-Sn bulk system and then its structure investigations and thermal properties structural. Chapter 5: gives the optical and electrical properties of the films of Se80Te20-xSnx (x=3, 6, 9, 12 and15 at. %). |