Tang Chaojun, Wang Qiugu, Liu Fanxin, Chen Zhuo, Wang Zhenlin
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
Opt Express. 2013 May 20;21(10):11783-93. doi: 10.1364/OE.21.011783.
We numerically investigate the optical forces in stereometamaterials composed of two-dimensional arrays of two spatially stacked split ring resonators with a twisted angle. At the hybridized magnetic resonances, we obtain both attractive and repulsive relative optical forces, which can be further exploited to control the separation between the two split ring resonators. Due to the strongest inductive coupling achieved for a twist angle of 180°, an attractive relative force as high as ~1200 piconewtons is realized at illumination intensities of 50 mW/µm(2). We show that a quasi-static dipole-dipole interaction model could predict well the characteristic and magnitude of the relative optical forces. We also demonstrate that although the optical force exerted on each of the split ring resonators could be oriented in a direction opposite to the propagation wave vector, the mass center of the two resonators is always pushed away from the light source.
我们对由具有扭曲角的两个空间堆叠的开口环谐振器的二维阵列组成的立体超材料中的光学力进行了数值研究。在杂化磁共振处，我们获得了吸引和排斥的相对光学力，这可进一步用于控制两个开口环谐振器之间的间距。由于在180°扭曲角时实现了最强的电感耦合，在50 mW/µm(2)的光照强度下实现了高达约1200皮牛的吸引相对力。我们表明，准静态偶极-偶极相互作用模型可以很好地预测相对光学力的特性和大小。我们还证明，尽管施加在每个开口环谐振器上的光学力可以沿与传播波矢量相反的方向定向，但两个谐振器的质心总是被推离光源。
