Microscopic Theory of Light Propagation and Localization in Periodic, Disordered, and Laser-active Media

周期性、无序和激光活性介质中光传播和定位的微观理论

• 批准号: 5436822
• 负责人: Professor Dr. Johann Kroha
• 金额: --
• 依托单位: Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5436822?language=en
• 关键词: Microscopic; Theory; Light; Propagation; Localization

Structuring a medium an the length scale of the light wavelength, either periodically or randomly (sintered dielectric powders etc.), as well as non-linearities in the dielectric response can drastically alter the properties of light in the medium. The goal of this project is to develop theories which provide, on a microscopic level, an understanding of the fundamental properties of light emission, propagation, and localization in such media, and which may thereby help to employ these properties in the design of micro-optical devices. The project encompasses two distinct research topics: (1) Non-linear optical effects in twodimensional wave guides with metallic nanoparticles due to coupling of particle-plasmons and photonic wave-guide modes (particle-plasmon polaritons). (2) Laser action in strongly disordered, active media without macroscopic resonator, where light confinement and laser feedback are achieved by multiple random scattering ("random laser"). The two topics are related to each other both with respect to the physical systems studied and to the methods used for their investigation. The semi-analytic description by self-consistent Feynman propagator techniques will be complemented by numerical finite difference time domain (FDTD) calculations of the wave fields. Subproject (1) will be done especially in close collaboration with Project C1.

在光波长的长度尺度上构造介质，无论是周期性的还是随机的（烧结介质粉末等），以及介质响应的非线性，都可以极大地改变介质中的光的性质。该项目的目标是发展理论，在微观层面上提供对这种介质中光发射、传播和定位的基本特性的理解，从而有助于在微光器件的设计中使用这些特性。该项目包括两个不同的研究课题：(1)由于粒子-等离子激元和光子波导模式（粒子-等离子激元极化激元）的耦合，金属纳米颗粒二维波导中的非线性光学效应。(2)激光作用于无宏观谐振腔的强无序有源介质中，通过多次随机散射（“随机激光”）实现光约束和激光反馈。这两个主题是相互关联的，无论是相对于研究的物理系统和用于他们的调查方法。采用自洽费曼传播算子技术的半解析描述将由波场的数值时域有限差分（FDTD）计算加以补充。子项目(1)将特别与项目C1密切合作完成。