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Image: A coloured nanoscale rendition of a standard test image used in image processing experiments – (a) Before the addition of metal in the nanostructures, the image has only grayscale tones as observed under an optical microscope. (b) Colours are observed using the same optical microscope after addition of the metal layers to the nanostrucutres and in specific patterns. (c) Zooming into the image with the same setup, the specular reflection at the corner of the eye is observed showing the refined colour detail that the new method is able to achieve. The region indicated (bottom right) is made up of nanostructures as observed in the electron micrograph. © A*STAR IMRE, Singapore
Karthik Kumar, Huigao Duan, Ravi S. Hegde, Samuel C. W. Koh, Jennifer N. Wei, Joel K. W. Yang: Printing colour at the optical diffraction limit, In: Nature Nanotechnology AOP, August 12, 2012, DOI:10.1038/nnano.2012.128: http://dx.doi.org/10.1038/nnano.2012.128
http://www.nature.com/nnano/journal/vaop/ncurrent/full/nnano.2012.128.html