Detail of the nanoantenna array forming the plasmonic metasurface for a hologram of the letter "P" – the visible area measures about 12 microns square, and the inset shows detail of the individual nanoantennas (Image: Purdue University)
A demonstration of how a layer of nanoantennas, each of which provides a characteristic optical phase shift, and alter the propagation of a light wave (Image: Vladimir M. Shalaev/Purdue University)
A holographic image being reconstructed 10 microns above a plasmonic metasurface (Image: Xingjie Ni, Birck Nanotechnology Center)
Figure of a plasmonic metasurface hologram of the word "PURDUE" that is about the width of a human hair (Image: Xingjie Ni, Birck Nanotechnology Center)
Holography is one of the more dramatic forms of photography, in which a three-dimensional image is stored on a photographic plate in the form of interference fringes. Researchers at Purdue University in Indiana have developed a different approach, in which a 3D image is stored in a structure of thousands of V-shaped nanoantennas etched into an ultrathin gold foil. The new approach dramatically shrinks the size of a hologram, potentially enabling photonic and plasmonic devices and optical switches small enough to be integrated into computer chips.
Other Images from this Gallery