terahertz invisibility cloak created - data projector

Washington, April 28ANI)
: Researchers at Northwestern University have created a new invisible material that can make objects invisible in the range of Hz.
Although this design cannot be converted into an invisible cloak of visible spectrum, it may have an impact on diagnosis, security, and communication.
Designed by Cheng Sun, assistant professor of Mechanical Engineering, School of Engineering and Applied Sciences, northwest McCormick, this cloak uses miniature
Manufacturing gradient
Index material used to control the reflection and refraction of light.
Humans usually recognize objects by their shape and color.
To make the object invisible, it must be able to manipulate the light so that it will neither scatter on the surface of the object nor be absorbed or reflected by the object (
The process of giving the color of the object).
In order to manipulate the light at a frequency of Hz located between infrared and microwave, the Sun and his team developed supermaterials: Materials designed at the atomic level.
Tiny prism of the Sun
Less than 10mm long shape invisible structures are created using a technology called electron transfer micro-stereo forming in which researchers use data projectors to project images on liquid polymers, the liquid layer is then converted into a thin solid layer by light.
The 220 layers of the Prism all have small holes much smaller than the wavelength of too Hertz, which means that they can change the refraction index of the light and make anything that is located below the surface bump at the bottom of the Prism invisible;
The light then appears to be reflected on a flat surface.
Sun said that the purpose of the cloak is not to hide objects, but to better understand how to design materials that can manipulate the spread of light.
"This shows that we are free to design materials that can change the index of refraction," Sun said . ".
"By doing so, we can manipulate the propagation of light more effectively," Sun added . ".
Historically, because the frequency is too high for electronic devices, the range of Hz is ignored.
But many organic compounds have a resonance frequency at the Hz level, which means they can be identified using a Hz scanner.
Sun's research on the Hertz optics may have an impact on biomedical research (
Safer detection of certain types of cancer)and security (
Use a Hertz scanner at the airport).
Sun's results will be released on May 4 at the annual laser and e-electronics conference CLEO: 2011Optics. (ANI)