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arXiv 1102.0794cond-mat.mes-hallquant-ph
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金属表面耦合等离子体纳米粒子与负折射率材料波导间的光学力

Optical Forces Between Coupled Plasmonic Nano-particles near Metal Surfaces and Negative Index Material Waveguides

C. Van Vlack, P. Yao, S. Hughes

摘要:

我们提出了一个研究两个耦合等离子体纳米粒子以上的各种平板几何形状,包括金属半空间和280纳米厚的负折射率材料(NIM)平板波导之间的光诱导力。我们研究光学力的非微扰计算散射电场通过格林函数技术,其中包括粒子相互作用的所有订单。对于激发频率附近的表面等离子体激元和慢光波导模式的金属和NIM,分别,我们发现丰富的光诱导力和显着的动力学反作用效应。发现光学猝灭在金属和NIM平面几何形状中都是重要的,这减小了可实现的颗粒间力的空间范围。然而,减少NIM中的损耗允许辐射更有效地通过慢光模式传播,从而导致两个粒子之间的光诱导力更加明显。为了突出粒子耦合的基本机制,我们将格林函数计算与量子光学中各种熟悉的量联系起来。

英文摘要:

We present a study of light-induced forces between two coupled plasmonic nano-particles above various slab geometries including a metallic half-space and a 280-nm thick negative index material (NIM) slab waveguide. We investigate optical forces by non-perturbatively calculating the scattered electric field via a Green function technique which includes the particle interactions to all orders. For excitation frequencies near the surface plasmon polariton and slow-light waveguide modes of the metal and NIM, respectively, we find rich light-induced forces and significant dynamical back-action effects. Optical quenching is found to be important in both metal and NIM planar geometries, which reduces the spatial range of the achievable inter-particle forces. However, reducing the loss in the NIM allows radiation to propagate through the slow-light modes more efficiently, thus causing the light-induced forces to be more pronounced between the two particles. To highlight the underlying mechanisms by which the particles couple, we connect our Green function calculations to various familiar quantities in quantum optics.

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