Active Plasmonics with Strong THz Fields

具有强太赫兹场的主动等离子体

• 批准号: 432266622
• 负责人: Professor Dr.-Ing. Franz Xaver Kärtner
• 金额: --
• 依托单位: Arbeitsgruppe Nichtlineare Optik und Quantenelektronik von Halbleitern
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/432266622?language=en
• 关键词: Active; Plasmonics; Strong; THz; Fields

Plasmonics treats the interaction of visible light with conduction band electrons in nanostructures of noble metal nanostructures.The resulting strongly localized electric field in the vicinity of metal nanoparticles has led to applications in fields ranging from high speed telecommunications to photovoltaics and biological sensing.Especially telecommunication and photonic applications rely on on a control and modulation of the plasmon properties, "active plasmonics".In principle, the plasmon properties depend on the properties of the conduction band electrons constituting the plasmon oscillation. Changing them changes the plasmon. Examples for approaches realizing active plasmonics try to, for exanple, modify the electron density by electrochemical doping. Still, the observed effects are not strong and, more importantly, the modulations are too slow for high-speed applications.We propose to use strong electric fields to modify the charge density within a nanoparticle.In our project, we aim at using strong electric fields of picosecond duration from THz pulses to perturb the electron cloud and to modify the plasmon properties. First experiments were promising and showed strong effects. We plan a systematic study to verify the effect and we want to develop a theory that allows texplaining and understanding the THz plasmon tuning.

等离子体激元在贵金属纳米结构的纳米结构中处理可见光与导带电子的相互作用。金属纳米粒子附近产生的强局域电场导致了从高速通信到光伏和生物传感等领域的应用。特别是通信和光子应用依赖于对等离子体激元性质的控制和调制，即活性等离子体激元。从原理上讲，等离子体激元的性质取决于构成等离子体激元振荡的导带电子的性质。改变它们会改变等离子激元。例如，实现活性等离子体激元的方法的例子试图通过电化学掺杂来改变电子密度。尽管如此，观察到的效应并不强，更重要的是，调制对于高速应用来说太慢了。我们建议使用强电场来改变纳米粒子内的电荷密度。在我们的项目中，我们的目标是使用太赫兹脉冲持续时间为皮秒的强电场来扰动电子云，并改变等离子激元的性质。最初的实验是有希望的，并显示出强大的效果。我们计划进行一项系统的研究来验证这一效应，我们想要开发一种理论来解释和理解太赫兹等离子激元的调谐。