Early research into metamaterials by other scientists has shown that nanostructured
metamaterials can focus incident light and act as a lens. Although such
structures are capable of subwavelength imaging, they have two major restrictions:
they can only work at one paticular wavelength, and the image can only
be transferred for a short distance within the limits of the near field
and is therefore undetectable in the far field. Here, we propose a lens
made of stacked silver nanorods that is capable of colour imaging at subwavelength
resolution in the visible range. The subwavelength image can be transferred
over distances of at least micrometre scale and magnified before detection
by conventional optics devices. Such a nanorod lens has the potential to
be an indispensable imaging tool, with particular application to biomedical
applications, where individual viruses and other nano-entities could be
imaged in colour in the far field. (Nature Photonics, Vol.2, p.438 (2008) より引用)
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