Shi Lei, Xifré-Pérez E, García de Abajo F J, Meseguer F
Centro de Tecnologías Físicas, Unidad Asociada ICMM/CSIC-UPV, Universidad Politécnica de Valencia, Valencia, Spain.
Opt Express. 2012 May 7;20(10):11247-55. doi: 10.1364/OE.20.011247.
Although science fiction literature and art portray extraordinary stories of people interacting with their images behind a mirror, we know that they are not real and belong to the realm of fantasy. However, it is well known that charges or magnets near a good electrical conductor experience real attractive or repulsive forces, respectively, originating in the interaction with their images. Here, we show strong interaction between an optical microcavity and its image under external illumination. Specifically, we use silicon nanospheres whose high refractive index makes well-defined optical resonances feasible. The strong interaction produces attractive and repulsive forces depending on incident wavelength, cavity-metal separation and resonance mode symmetry. These intense repulsive photonic forces warrant a new kind of optical levitation that allows us to accurately manipulate small particles, with important consequences for microscopy, optical sensing and control of light by light at the nanoscale.
尽管科幻文学艺术描绘了人们与镜子后面自己的影像互动的离奇故事，但我们知道这些并非真实，而是属于幻想领域。然而，众所周知，在良好的电导体附近的电荷或磁体分别会经历真实的吸引力或排斥力，这源于它们与自身影像的相互作用。在此，我们展示了在外部光照下光学微腔与其影像之间的强相互作用。具体而言，我们使用了硅纳米球，其高折射率使得明确的光学共振成为可能。这种强相互作用会根据入射波长、腔与金属的间距以及共振模式对称性产生吸引力和排斥力。这些强烈的排斥性光子力保证了一种新型的光学悬浮，使我们能够精确操纵小颗粒，这对纳米尺度下的显微镜技术、光学传感以及光对光的控制具有重要意义。
