Super Metamaterials - Penn State's Sound Cloaking

Sounds of Invisibility

Penn State researchers have created an underwater ground cloaking technology that's capable of redirecting sound waves so objects appear invisible.  What's different here is sound waves not light waves are used to cloak.  And it's not just theory.  It's been tested and works.

Super Metaterials
The cloak uses a metamaterial not found in nature.  It allows sound wave to bend around objects as though they weren't there.

Put to the Test
The Penn State scientists tested their cloaking tech.   They created a 3 foot tall pyramid of steel and placed it underwater.  They used a hydrophone to produce sound.  The metamaterial redirected the sound waves around the pyramid, making it invisible.

Cloaking Emerges from Science Fiction
According to Asst. Prof. Amanda Hanford their metamaterial is real and works. "We're working to open the floodgates to see what we can create with these materials."  In the past couple of years, there have been significant advancements in cloaking technology including research at the Technical University of Vienna, University of California and University of Rochester.