MODELING OF OPTICAL TRAPPING USING DOUBLE NEGATIVE INDEX FISHNET METAMATERIALS
MODELING OF OPTICAL TRAPPING USING DOUBLE NEGATIVE INDEX FISHNET METAMATERIALS
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DOI：
10.2528/pier12050309
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发表时间：
2012
影响因子：
6.7
通讯作者：
T. Cao;M. Cryan
中科院分区：
文献类型：
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作者：
T. Cao;M. Cryan
本文计算了近红外波长下，金属/电介质/金属薄膜超材料表面附近纳米粒子所受的光动力。这些力显示出与双负折射率flshnet超材料中的磁共振频率相似的共振频率。我们还表明，光学力可以通过优化的flshnet的几何形状，以提供更强的磁共振偶极子增强。与大多数总是使用电共振偶极子获得捕获力的其他等离子体纳米结构相比，我们提出的结构利用磁共振来提供捕获力。我们发现，在1 mW/“m2的光照强度下，这种光阱就可以捕获纳米级的粒子，而且捕获力足以克服重力。
We calculate the optical forces exerted on nanoparticles in close proximity to the surface of flshnet metamaterials based on metal/dielectric/metal fllms when irradiated at near infrared wavelength. These forces show resonant frequencies similar to the magnetic resonant frequencies in the double negative index flshnet metamaterial. We also show that the optical force can be enhanced by optimizing the geometry of the flshnet to provide a stronger magnetic resonant dipole. In contrast to most other plasmonic nanostructure which always obtaining trapping force using an electrical resonant dipole, our presented structure utilizes the magnetic resonance to provide a trapping force. We have found that it is suitable for optical trapping of nanoscale particles at illumination intensities of just 1mW/"m 2 and the force is su-cient to overcome gravity.