Ultrafast nonlinear optical response of metallic nanostructures: Collective effects and hybrid materials

金属纳米结构的超快非线性光学响应：集体效应和混合材料

• 批准号: 223324884
• 负责人: Professor Dr. Stefan Linden
• 金额: --
• 依托单位: Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/223324884?language=en
• 关键词: Ultrafast; nonlinear; optical; response; metallic

Particle plasmons, i.e. coherent excitations of the conduction band electrons, govern the optical properties of metallic nanostructures in the visible and in the near-infrared spectral region. Excitation of these particle plasmons with ultrashort light pulses gives can give rise to a spatiotemporal concentration of the electromagnetic field in the vicinity of the metallic nanostructure. The intensity in these „hot spots“ can exceed the incident intensity by orders of magnitude. In this project, we will investigate the ultrafast nonlinear optical response of metallic nanostructures. At this, we will concentrate on two aspects. The first subproject is devoted to collective effects in periodic metal nanoparticle arrays and complex metallic nanostructures containing several tightly packed particles. Here, we will study how the electromagnetic interaction between the particles modifies the nonlinear optical response of the ensemble. In the second subproject, we will investigate hybrid nonlinear optical materials composed of a metallic nanostructure and a dielectric nonlinear optical nanoparticle. We will combine the spatiotemporal „hot spots“ in the metallic nanostructure with the large nonlinear optical susceptibility provided by the nanoparticles in order to obtain an efficient nonlinear response even for moderate pulse intensities.

粒子等离子体激元，即导带电子的相干激发，支配金属纳米结构在可见光和近红外光谱区域中的光学性质。用超短光脉冲激发这些粒子等离子体可以引起金属纳米结构附近的电磁场的时空集中。这些“热点”中的强度可以超过入射强度几个数量级。在本计画中，我们将研究金属奈米结构的超快非线性光学响应。在这方面，我们将集中在两个方面。第一个子项目致力于周期性金属纳米粒子阵列和复杂的金属纳米结构包含几个紧密堆积的颗粒的集体效应。在这里，我们将研究粒子之间的电磁相互作用如何改变系综的非线性光学响应。在第二个子计划中，我们将研究由金属奈米结构与介电质非线性光学奈米粒子所组成的混合非线性光学材料。我们将联合收割机将金属纳米结构中的时空“热点”与纳米颗粒提供的大非线性光学极化率相结合，以便即使对于中等脉冲强度也获得有效的非线性响应。