Nichtlineare Wechselwirkungen in einkristallinen plasmonischen Nanoschaltkreisen

单晶等离子体纳米电路中的非线性相互作用

• 批准号: 137540607
• 负责人: Professor Dr. Tobias Brixner
• 金额: --
• 依托单位: Institut für Physikalische und Theoretische Chemie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/137540607?language=en
• 关键词: Nichtlineare; Wechselwirkungen; einkristallinen; plasmonischen; Nanoschaltkreisen

In the upcoming funding period of the project we plan to investigate the influence of nonlinear optical effects on the propagation of ultrashort plasmon pulses. Nonlinearities are essential for the implementation of plasmonic circuitry since they will allow the manipulation of plasmons by plasmons. Due to the strong field localization and enhancement, nonlinear effects can be significantly enhanced. However, the nonlinear propagation of plasmon pulses has rarely been investigated experimentally. Our experimental setup provides a unique opportunity to study the amplitude and phase modification of propagating plasmons due to nonlinear interactions. Nonlinearities that will be investigated are the ponderomotive nonlinearity of plasmonic materials themselves, the free-carrier nonlinearity of e.g. ITO-substrates, as well as Kerr-type nonlinearities of the substrates or well-positioned nanoparticles, such as Chalcogenide glasses. Depending on the type of nonlinearity, we will design plasmonic elements that support well-chosen mode patterns to achieve maximal effects. We will also employ well-designed excitation geometries for specific modes. For the implementation of advanced nanostructures, beyond the commonly used single straight wires, we will build on focused-ion beam patterning of single-crystalline gold as developed during the first phase of the project. We will also evaluate the use of He-ion milling to fabricate structures with extremely fine details. The final goal of the project is the implementation of functional plasmonic elements such as switches and couplers that take advantage of the richness of nonlinear interactions as opposed to basic linear interferometric control. Experimental studies will be performed on two exemplary circuits: (i) a two-wire transmission line featuring a local bottleneck in which strong mode localization occurs and (ii) a straight two-wire transmission line with a high-local-intensity resonant stub that suppresses transmission under action of a Kerr-like nonlinearity. Nonlinear effects will be characterized by (a) the appearance of new modes which are detected via different angular-spatial emission patterns, (b) measuring changes of transmission and group velocities, and (c) analyzing the time-domain structure of the emitted signal as a function of the pulse’s peak intensity.

在即将到来的项目资助期内，我们计划研究非线性光学效应对超短等离子体脉冲传播的影响。非线性对于等离子体电路的实现是必不可少的，因为它们将允许等离子体对等离子体的操纵。由于强场的局域化和增强，非线性效应显著增强。然而，对等离子激元脉冲的非线性传播却很少进行实验研究。我们的实验装置提供了一个独特的机会来研究由于非线性相互作用而引起的传播等离子体的振幅和相位变化。将被研究的非线性是等离子体材料本身的质心非线性，如ito衬底的自由载流子非线性，以及衬底或定位良好的纳米颗粒的克尔型非线性，如硫系玻璃。根据非线性的类型，我们将设计支持精心选择的模式模式的等离子体元件，以达到最大的效果。我们还将采用精心设计的激励几何形状的特定模式。为了实现先进的纳米结构，除了常用的单直线之外，我们将建立在项目第一阶段开发的单晶金的聚焦离子束图案上。我们还将评估使用氦离子铣削制造具有极其精细细节的结构。该项目的最终目标是实现功能等离子体元件，如开关和耦合器，利用丰富的非线性相互作用，而不是基本的线性干涉控制。实验研究将在两个示例电路上进行：(i)具有局部瓶颈的两线传输线，其中发生强模式局部化；（ii）具有高局部强度谐振短段的直两线传输线，该短段在kerr类非线性作用下抑制传输。非线性效应的特点是：(a)通过不同的角空间发射模式检测到的新模式的出现，(b)测量传输和群速度的变化，以及(c)分析发射信号的时域结构作为脉冲峰值强度的函数。