Theory of the Nonlinear Optical Response in One-dimensional Systems: Charge vs. Energy Transfer

一维系统中的非线性光学响应理论：电荷与能量转移

• 批准号: 9312029
• 负责人: Francis Spano
• 金额: $ 12万
• 依托单位: Temple University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-02-15 至 1997-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9312029&HistoricalAwards=false
• 关键词: Theory; Nonlinear; Optical; Response; dimensional

9312029 Spano A theory for the nonlinear optical response in quasi-one- dimensional systems, such as electron-donor-acceptor crystals, halogen-bridged mixed-valence transition metal complexes, polysilanes and molecular J-aggregates will be developed in an effort to better understand the roles of energy transfer versus charge transfer in systems with varying degrees of diagonal and nondiagonal disorder. Charge and excitation delocalization affects the magnitude and size dependence of the nonlinear optical response in profoundly different ways. In the initial phases of the research, noninteracting electron and mean-field Hamiltonians will be used to obtain an analytical expression for the third order optical response. Beyond mean-field theory, numerical calculations will be conducted on finite chains and extrapolated to the crystal limit. This new grant is funded jointly by the Division of Materials Research and the Chemistry Division. %%% A theoretical research program funded jointly by the Division of Materials Research and the Chemistry Division will be initiated to calculate the nonlinear optical properties of quasi-one-dimensional materials. A thorough understanding of these materials, in the bulk limit, is necessary in order to apply them to various photonic devices. ***

9312029 Spano将发展准一维系统中非线性光学响应的理论，如电子给体-受体晶体、卤素桥连混合价态过渡金属络合物、聚硅烷和分子J聚集体，以更好地理解具有不同程度对角和非对角无序的系统中能量转移与电荷转移的作用。 电荷和激发离域以完全不同的方式影响非线性光学响应的幅度和尺寸依赖性。 在研究的初始阶段，非相互作用的电子和平均场哈密顿量将被用来获得三阶光学响应的解析表达式。 在平均场理论之外，将对有限链进行数值计算，并外推到晶体极限。 这项新的赠款由材料研究部和化学部共同资助。 %%% 将启动由材料研究部和化学部联合资助的理论研究计划，以计算准一维材料的非线性光学性质。 为了将它们应用于各种光子器件，有必要在体积限制下对这些材料进行彻底的理解。 ***