Full article:
http://www.ineffableisland.com/2014/01/nikola-tesla-dream-come-true-wireless.html

clip:
"Duke University researchers have demonstrated the feasibility of wireless power transfer using low-frequency magnetic fields over distances much larger than the size of the transmitter and receiver.

Each side of each constituent cube of the “superlens” is set with a long, spiraling copper coil. The end of each coil is connected to its twin on the reverse side of the wall.

he advance comes from a team of researchers in Duke’s Pratt School of Engineering, who used metamaterials to create a “superlens” that focuses magnetic fields. The superlens translates the magnetic field emanating from one power coil onto its twin nearly a foot away, inducing an electric current in the receiving coil.

The experiment was the first time such a scheme has successfully sent power safely and efficiently through the air with an efficiency many times greater than what could be achieved with the same setup minus the superlens."

FYI, this has nothing to do with Tesla. Using his name is just a marketing ploy. Tesla's work concerned transmitting industrial scale power worldwide. This thing will charge a few low power devices like cell phones or tablets.

Tesla considered enough electricity to power a town small and he wasn't talking about just the residences. That included the businesses also.

He spoke in an article of transmitting at 15 miles (79,200 feet) but in his US Patent 645,576 it is stated that he could accomplish it at 30,000 feet altitude which he considered "easily accessible". The thing most everyone misses is that he was proposing transmitting between tethered baloons maintained at that altitude. There are two entries in his Colorado Springs Notes about using electricity to extract hydrogen from the atmosphere to use in the balloons.

In effect what he proposed was to transmit high voltage (in the millions of volts), high frequency impulses between tethered balloons resulting in man made lightning similar to cloud to cloud lightning discharges.

This wouldn't have worked if he had tried it because of the jet stream but the jet stream was unknown at the time. He later realized he could do the same thing through the crust of the earth. See his July 4, 1899 Coloradso Springs notes. He was still considering balloons at that time because one of the notes referring to hydrogen for the balloons was the next day, July 5, 1899. There are no photos or articles about maintaining balloons at 30,000 feet that I am aware of and there surely would have been because it would have been a major endeavor.

645,576 - System of Transmission of Electrical Energy
Colorado Springs Notes - July 1-31, 1899
Scroll down to July 4, 1899