Focusing light on flexoelectricity
نویسندگان
چکیده
منابع مشابه
Subdiffraction light focusing on a grating substrate.
We describe a way to generate subdiffraction light spots that can be moved over a surface without resorting to near-field manipulation, nonlinear effects, or negative index materials. We use a periodically patterned substrate that converted efficiently, through scattering, the impinging propagative waves into evanescent ones. Then we optimize the wave front of the incident propagative beam so t...
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Tissues such as skin, fat or cuticle are non-transparent because inhomogeneities in the tissue scatter light. We demonstrate experimentally that light can be focused through turbid layers of living tissue, in spite of scattering. Our method is based on the fact that coherent light forms an interference pattern, even after hundreds of scattering events. By spatially shaping the wavefront of the ...
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A slab of negatively refracting material, thickness d , can focus an image at a distance 2d from the object. The negative slab cancels an equal thickness of positive space. This result is a special case of a much wider class of focusing: any medium can be optically cancelled by an equal thickness of material constructed to be an inverted mirror image of the medium, with ε, μ reversed in sign. W...
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ژورنال
عنوان ژورنال: Nature Nanotechnology
سال: 2015
ISSN: 1748-3387,1748-3395
DOI: 10.1038/nnano.2015.213