The ultimate resolution for printing colour images is dictated by the diffraction limit of visible light. To achieve this limit, Joel K. W. Yang and co-workers from IMRE, A*STAR in Singapore use a nanopatterned surface composed of silverâgold nanoposts and a backreflector over a silicon substrate. The metallic nanostructures interact with the incident light of a bright-field microscope through surface plasmon resonances and reflect a wide range of colours depending on the diameter and spacing of the nanoposts. The cover shows a false colour close-up of this nanopatterned surface coding for a portion of the left eye in the famous Lena image. The colours of the nanoposts correspond to the actual reflected wavelength, as seen through a bright-field microscope.
Letters p557; News & Views p550
IMAGE: KARTHIK KUMAR, HUIGAO DUAN, RAVI S. HEGDE, SAMUEL C. W. KOH, JENNIFER N. WEI AND JOEL K. W. YANG
COVER DESIGN: ALEX WING