Hiding Objects With a Terahertz Invisibility…
Hiding Objects With a Terahertz Invisibility Cloak
Researchers at Northwestern University have created a new kind of cloaking material that can render objects invisible in the terahertz range. Though this design can’t translate into an invisibility cloak for the visible spectrum, it could have implications in diagnostics, security, and communication.
The cloak, designed by Cheng Sun, assistant professor of mechanical engineering at Northwestern’s McCormick School of Engineering and Applied Science, uses microfabricated gradient-index materials to manipulate the reflection and refraction of light.
Sun’s research was published Sept. 1 in Scientific Reports, a new online, open-source journal that provides rapid publication and high visibility of research for all areas of science.
Humans generally recognize objects through two features: their shape and color. To render an object invisible, one must be able to manipulate light so that it will neither scatter at an object’s surface nor be absorbed or reflected by it (the process which gives objects color).
In order to manipulate light in the terahertz frequency, which lies between infrared and microwaves, Sun and his group developed metamaterials: materials that are designed at the atomic level. Sun’s tiny, prism-shaped cloaking structure, less than 10 millimeters long, was created using a technique called electronic transfer microstereolithography, where researchers use a data projector to project an image on a liquid polymer, then use light to transform the liquid layer into a thin solid layer. Each of the prism’s 220 layers has tiny holes that are much smaller than terahertz wavelengths, which means they can vary the refraction index of the light and render invisible anything located beneath a bump on the prism’s bottom surface; the light then appears to be reflected by a flat surface.
Next Sun hopes to use what he’s learned through the cloak to create its opposite: a terahertz lens. He has no immediate plans to extend his invisibility cloak to visible frequencies. “That is still far away,” he said. “We’re focusing on one frequency range, and such a cloak would have to work across the entire spectrum.”
Contact: Megan Fellman [email protected] 847-491-3115 Northwestern University