Harry Potter? New Invisibility Cloak Hides Objects from Human View

ScienceDaily (July 28, 2011) — For the first time, scientists have devised an invisibility cloak material that hides objects from detection using light that is visible to humans. The new device is a leap forward in cloaking materials, according to a report in the ACS journal Nano Letters. Xiang Zhang and colleagues note that invisibility cloaks, which route electromagnetic waves around an object to make it undetectable, "are still in their infancy." Most cloaks are made of materials that can only hide things using microwave or infrared waves, which are just below the threshold of human vision. To remedy this, the researchers built a reflective "carpet cloak" out of layers of silicon oxide and silicon nitride etched in a special pattern. The carpet cloak works by concealing an object under the layers, and bending light waves away from the bump that the object makes, so that the cloak appears flat and smooth like a normal mirror.

Read more at link.

July 1, 2007 — Computer scientists and engineers have developed a new technology for the purpose of seeing through walls. The new technological gadget boasts visual penetration through wood, plaster, brick and reinforced concrete. The device uses sound waves at a particular frequency and a series of algorithms in the computer software to capture images through a wall or door and create 3D images. The military and law enforcement agencies hope to incorporate the device into their projects.

See video at link: http://www.sciencedaily.com/videos/2007/0706-seeing_through_walls.htm