nanoantenna
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We're getting closer to real invisibility cloaks
We've been inching closer to real-life invisibility cloaks for a bit now, but going full on Harry Potter in the Hogwarts library is probably still a ways off. The latest advancement in metamaterial-based vanishing tech from Iowa State University guards whatever it's placed on from cameras, according to a paper published in Nature. The naked eye? Not so much. And even those cameras can't hide it from a human viewing a video feed, only other machines or perhaps radar. The researchers achieved this by embedding split ring resonators filled with galinstan into silicone sheets. Stretching those sheets is a form of tuning of sorts, and allowed the scientists to suppress certain radar waves up to about 75 percent. This type of tech could be used in a stealth fighter jet for example, as everything RF notes.
Harvard makes distortion-free lens from gold and silicon, aims for the perfect image (or signal)
Imaging has been defined by glass lenses for centuries, and even fiber optics haven't entirely escaped the material's clutch. Harvard's School of Engineering and Applied Sciences might have just found a way to buck those old (and not-so-old) traditions. A new 60-nanometer thick silicon lens, layered with legions of gold nanoantennas, can catch and refocus light without the distortion or other artifacts that come with having to use the thick, curved pieces of glass we're used to -- it's so accurate that it nearly challenges the laws of diffraction. The lens isn't trapped to bending one slice of the light spectrum, either. It can range from near-infrared to terahertz ranges, suiting it both to photography and to shuttling data. We don't know what obstacles might be in the way to production, which leads us to think that we won't be finding a gold-and-silicon lens attached to a camera or inside a network connection anytime soon. If the technology holds up under scrutiny, though, it could ultimately spare us from the big, complicated optics we often need to get just the right shot.
New "nanoantenna" material sucks heat from any source to cool devices, generates electricity
We're always up for another way to harvest energy from the sun, but this new nanoantenna material developed by the DoE's Idaho National Laboratory makes solar panels seem a little passe. The material, composed of tiny gold antennas set in polyethylene plastic is tuned to gather 80 percent of energy from infrared rays in its production version, and can gather energy from the sun, earth, or even your PC's warmth. The antennas can be tuned to different parts of the infrared spectrum, and the thin material can be sandwiched together to cover the full desired range. Unfortunately, the resulting current generated alternates at rates too high to be converted to DC with current technology -- new manufacturing processes will needed -- but once that problem is solved, nanoantennas should easily best solar cells in efficiency and production costs.[Via DailyTech]
