After years of research, "perfect" invisibility cloaks are finally a reality— at least so long as you are a tiny cylinder.
In 2006, the development of metamaterials resulted in a working example of a cloaking device, an essential accoutrement for young wizards and evil Klingon generals alike. Practical complexities, however, meant the material offered no more than a "simplifying approximation" of the desired functionality.
Now, however, researchers Nathan Landy and David R. Smith have described a "perfect" implementation in A full-parameter unidirectional metamaterial cloak for microwaves, a new study published by Nature: "Here, we design and experimentally characterize a two-dimensional, unidirectional cloak that makes no approximations to the underlying transformation optics formulation, yet is capable of reducing the scattering of an object ten wavelengths in size. We demonstrate that this approximation-free design regains the performance characteristics promised by transformation optics."
In other words, the cloaked object is completely invisible, unlike previous attempts in which reflections were visible: good enough for the Predator's interstellar hunting trips, but not for the Center for Metamaterials and Integrated Plasmonics in Durham, N.C.
While this is the first successful demonstration of the original 2006 paper's claims, that's not to say that there'll be practical implementations any time soon. The effect still only worked when viewed from one direction, and on a perfectly cylindrical object.
NASA’s Langley Research Center in Hampton, Virginia turns 100 this year. In celebration, the space agency produced this short documentary and enlisted Captain Kirk himself, William Shatner, to narrate. Here are just a few highlights from NASA Langley’s incredible history: • In times of peace and war, NASA Langley helped to create a better airplane, […]
Rio Celeste is a gorgeous Costa Rican river with a length that’s famous for its unusual turquoise waters. After decades of guessing, scientists finally determined the cause was aluminosilicate:
AntsCanada (previously) has an overpopulation problem in his yellow crazy ant colony, so he added two kinds of carnivorous pitcher plants. The resulting relationship between ant versus plant turned out to be quite fascinating.
The Fader Stealth Quadcopter from TRNDlabs packs incredible flight performance into a package small enough to land on your phone screen, and it’s available now in the Boing Boing Store.The Fader’s six-axis gyroscope module gives it perfect balance in the air. This makes the onboard 720p HD camera all the better for shooting amazing flight […]
Although fully autonomous vehicles aren’t yet allowed on public streets, they are poised to dominate the roads in the not-too-distant future. But before that happens, Apple, Google, Uber, and other companies now investing in self-driving tech are going to need talented developers that can account for the dizzying array of factors at play when a […]
The PiCar-V learning kit comes with everything you need to build a Python-powered robot, and it’s currently being offered in the Boing Boing Store.