超材料“壁虎脚趾”：光学控制粘附到任何表面
Metamaterial 'Gecko Toe': Optically-Controlled Adhesion to Any Surface
摘要：
在介观尺度上，电磁力对于从光镊到壁虎脚趾的粘附力等各种各样的系统都具有根本的重要性。在这里，我们表明，一个强大的光驱动力时，可能会产生一个等离子体超材料被照射在电介质或金属表面附近。这种近场力可以超过辐射压力和卡西米尔力，从而提供一种模仿壁虎脚趾的光控粘附机制：在几十nW/um ^2的光照强度下，就足以克服地球的引力。
英文摘要：
On the mesoscopic scale, electromagnetic forces are of fundamental importance to an enormously diverse range of systems, from optical tweezers to the adhesion of gecko toes. Here we show that a strong light-driven force may be generated when a plasmonic metamaterial is illuminated in close proximity to a dielectric or metal surface. This near-field force can exceed radiation pressure and Casimir forces to provide an optically controlled adhesion mechanism mimicking the gecko toe: at illumination intensities of just a few tens of nW/um^2 it is sufficient to overcome the Earth's gravitational pull.
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