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arXiv 1012.1576physics.opticscond-mat.mtrl-sci
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负折射率材料中的增益和等离子体动力学

Gain and plasmon dynamics in negative-index metamaterials

Sebastian Wuestner, Andreas Pusch, Kosmas L. Tsakmakidis, Joachim M. Hamm, Ortwin Hess

摘要:

光子超材料允许一系列令人兴奋的应用无法实现与普通的光子晶体。然而,它们的元原子的金属性质可能导致增加的光学损耗。增益增强超材料是解决这个问题的一个潜在方案,但现实的三维设计的概念是一个具有挑战性的任务。从基本的电动力学和量子力学方程出发,我们建立并部署了一个严格的理论模型,用于光波与金属(纳米)结构和增益介质内部和周围的自由和束缚电子的空间和时间相互作用。导出的数值框架使我们能够自洽地研究相干等离子体增益相互作用,非线性饱和,场增强,辐射阻尼和空间色散的动力学和影响。利用数值泵浦-探测实验,我们研究了具有染料分子夹杂物的双鱼网超材料结构的反转轮廓的建立和低Q腔中等离子体激元模式的形成。我们发现,全损耗补偿发生在一个政权的超材料的有效折射率的实部变得更负相比,被动的情况下。我们的研究结果提供了一个深刻的洞察内部过程如何影响的整体光学性能的有源光子超材料培育新的方法来设计的实际损失补偿等离子体纳米结构。

英文摘要:

Photonic metamaterials allow for a range of exciting applications unattainable with ordinary dielectrics. However, the metallic nature of their meta-atoms may result in increased optical losses. Gain-enhanced metamaterials are a potential solution to this problem, but the conception of realistic, three-dimensional designs is a challenging task. Starting from fundamental electrodynamic and quantum-mechanical equations we establish and deploy a rigorous theoretical model for the spatial and temporal interaction of lightwaves with free and bound electrons inside and around metallic (nano-) structures and gain media. The derived numerical framework allows us to self-consistently study the dynamics and impact of the coherent plasmon-gain interaction, nonlinear saturation, field enhancement, radiative damping and spatial dispersion. Using numerical pump-probe experiments on a double-fishnet metamaterial structure with dye molecule inclusions we investigate the build-up of the inversion profile and the formation of the plasmonic modes in the low-Q cavity. We find that full loss compensation occurs in a regime where the real part of the effective refractive index of the metamaterial becomes more negative compared to the passive case. Our results provide a deep insight into how internal processes affect the over-all optical properties of active photonic metamaterials fostering new approaches to the design of practical loss-compensated plasmonic nanostructures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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