Bulk/Film Structural Comparison of Chalcogenide Glasses for Waveguide Applications

9974129 Cerqua-Richardson基于硫化砷(As2S3)玻璃的光学元件自从20世纪60年代末S开发这类玻璃以来，已经被广泛用于红外光学应用。在过去的几年中，As2S3和相关的硫化物玻璃已经被用于各种基于块状、薄膜或光纤形式的新型光学元件。这项为期三年的多学科研究项目将考察大块砷硫硒玻璃与用于集成光学器件系统中的多层薄膜波导的沉积玻璃薄膜之间存在的基本结构和光学性能差异。该项目旨在确定玻璃中潜在的化学和结构差异，并评估这些差异对所产生的光波导的光学性能的影响。将研究玻璃薄膜与母体玻璃的结构和成分(包括化学计量比和结合变化)的差异，以及这些差异如何与工艺条件(熔化和气相沉积)相关。将使用表面和块状玻璃结构工具，如XPS、EXAFS和选定的光谱技术来识别结构特征的差异。薄膜沉积条件规定了结构单元如何形成并组装成稳定的和亚稳定的配置，将通过拉曼光谱和其他技术进行表征。将确定硫系玻璃块体和薄膜形式的关键结构单元的一致性，以及单元浓度的相对差异对物理性能(包括线性和非线性光学)的作用。沉积时薄膜结构和性能的稳定性以及本征和非本征玻璃缺陷对玻璃结构、光学行为和稳定性的作用将被确定。最后，研究了光相互作用下玻璃薄膜的结构变化以及对玻璃结构和最终器件光学性能的影响。本项目的目标是评估当块状硫化物玻璃经过通常用于生产集成光学器件系统中的多层薄膜波导的薄膜加工程序时，在成分、结构、物理性能和光学性能方面会产生什么变化。该项目将由一个专门的研究小组执行，该小组由来自中佛罗里达大学光学和激光研究和教育中心(CREOL)和先进材料处理和分析中心(AMPAC)、拉瓦尔大学(加拿大魁北克)光学、光子学和激光中心以及波尔多国家科学研究中心(法国波尔多)的国际多学科研究人员组成。这些团体拥有并正在进行的关系将促进该项目的教师和学生交流部分，进一步扩大该项目对参与机构的技术和教育项目的影响。

9974129Cerqua-RichardsonOptical components based on arsenic sulfide (As2S3) glasses have been widely used for infrared optical applications since the development of these glasses in the late 1960's. During the past several years, As2S3 and related chalcogenide glasses have found use in a variety of novel optical components based on bulk, film, or fiber forms. This three year, multidisciplinary research project will examine the fundamental structural and optical property differences that exist between bulk arsenic-sulfur-selenium glasses and the as-deposited glass films as would be used in the multilayer thin film waveguides found in integrated optical device systems . The project aims to identify the underlying chemical and structural differences in the glasses and assess the ramifications of such differences on the optical performance of the resulting waveguide. The structural and compositional (including stoichiometric and bonding variations) differences in glass film versus parent bulk glass, and how these differences relate to processing conditions (melting versus vapor deposition) will be examined. Surface and bulk glass structural tools such as XPS, EXAFS and selected spectroscopic techniques will be used to identify differences in structural features. Film deposition conditions, which dictate how structural units form and assemble into stable and metastable configurations, will be characterized by Raman spectroscopy and other techniques. The identity of key structural units in bulk and film forms of chalcogenide glasses and the role that relative differences in unit concentrations play on physical properties (including linear and nonlinear optical) will be identified. The stability of as-deposited film structure and properties and the role of intrinsic and extrinsic glass defects on the glass structure, optical behavior, and stability will be determined. Finally, the structural modification that occurs in glass films with light interaction and the impact on glass structure and ultimate device optical performance will be investigated. %%%The objective of this project is to assess what variation in composition, structure, physical properties, and optical performance result when bulk chalcogenide glasses undergo thin film processing procedures commonly used in the production of multilayer thin film waveguides used in integrated optical device systems. This project will be performed by a Focussed Research Group consisting of an international, multidisciplinary team of researchers from the Center for Research and Education on Optics and Lasers (CREOL) and the Advanced Materials Processing and Analysis Center (AMPAC) at the University of Central Florida, the Center for Optics, Photonics and Lasers at the Universite de Laval (Quebec, Canada), and the Institut de Chimie de la Matiere Condensee Bordeaux of the Centre National de la Recherche Scientifique (Bordeaux, France). These groups have and on-going relationship that will facilitate the faculty and student exchange part of the project, further broadening the project's impact on technological and educational programs at the participating institutions.***