Abstract
Surfaces covered with layers of ultrathin nanoantenna structures—so called metasurfaces have recently been proven capable of completely controlling phase of light. Metalenses have emerged from the advance in the development of metasurfaces providing a new basis for recasting traditional lenses into thin, planar optical components capable of focusing light. The lens made of arrays of plasmonic gold nanorods were fabricated on a glass substrate by using electron beam lithography. A 1064 nm laser was used to create a high intensity circularly polarized light focal spot through metalens of focal length 800 µm, N.A. = 0.6 fabricated based on Pancharatnam-Berry phase principle. We demonstrated that optical rotation of birefringent nematic liquid crystal droplets trapped in the laser beam was possible through this metalens. The rotation of birefringent droplets convinced that the optical trap possesses strong enough angular momentum of light from radiation of each nanostructure acting like a local half waveplate and introducing an orientation-dependent phase to light. Here, we show the success in creating a miniaturized and robust metalens based optical tweezers system capable of rotating liquid crystals droplets to imitate an optical motor for future lab-on-a-chip applications.
Highlights
Metamaterials are artificial materials with unusual properties that have emerged from a structural arrangement rather than composition
The interaction of the left circularly polarized laser beam with 30 mW power passing through the metalens resulted in the intensity profile of the focal spot at different locations from the lens as
Toclear fullyrotation employinthe polarized focus of the metalens, applied this shows thecircularly optical trap with the texture changing all we the time.further mW laser miniaturized metalens based laser tweezers system on birefringent droplets is tweezers, the rotation appeared to be confined in the observation plane
Summary
Metamaterials are artificial materials with unusual properties that have emerged from a structural arrangement rather than composition. By directly designing the arrangement of meta-atoms, extraordinary properties of light propagation beyond nature availability can be achieved [1,2,3]. This emerging field of metamaterials has capture enormous interest from scientists to explore unique optical effects such as cloaking, negative refraction or ultrathin lenses. Powerful and sophisticate electromagnetic modeling software, nowadays, is able to accurately simulate and predict the response of pattern design before fabrication attempt. The success in creating metamaterials in the visible light region was first reported in 2007 [4]. A novel type of metamaterial consisting of planar arrays of artificial nanostructures on ultrathin layers—so-called metasurfaces—capable of light
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