optical field
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The Amazing Gecko-Man: a superhero future made possible by probable science
There's no superhero origin story that begins with a bite (or a lick?) from a gecko. Plain 'ol wall climbing powers are, it seems, just not as sexy as wearing skintight suits, slinging webs and crawling up buildings. But if a few bright minds at the University of Southampton have anything to say about it, we could soon find ourselves walking like real-life lizard people (V, anyone?) and suctioning onto various surfaces using the managed properties of light. Lead researcher John Zhang and his UK team have predicted the existence of a force more powerful than gravity and the short-range pull of the Casimir effect, whereby plasmons (electromagnetic waves) captured on a metamaterial and the electrons on a metal resonate and form a bond of attraction. The resultant particle field is supposedly strong enough to "overcome the Earth's gravitational pull" and could even be used to alter the reflectivity of a material. Obvious military and aerospace applications aside, this invisible adhesive could also make its way into our everyday lives -- they just need to need to prove that it, y'know, actually exists first.
Researchers build world's smallest steam engine that could
Wanna create your very own microscopic steam engine? Just take a colloid particle, put it in water, and add a laser. That's a CliffsNotes version of what a group of German researchers recently did to create the world's smallest steam engine. To pull it off, engineers from the University of Stuttgart and Max Planck Institute for Intelligent Systems tweaked the traditional approach introduced by Robert Stirling nearly 200 years ago. In Stirling's model, gas within a cylindrical tube is alternately heated and cooled, allowing it to expand and push an attached piston. Professor Clemens Bechinger and his team, however, decided to downsize this system by replacing the piston with a laser beam, and the cylinder's working gas with a single colloid bead that floats in water and measures just three thousandths of a millimeter in size. The laser's optical field limits the bead's range of motion, which can be easily observed with a microscope, since the plastic particle is about 10,000 times larger than an atom. Because the beam varies in intensity, it effectively acts upon the particle in the same way that heat compresses and expands gas molecules in Stirling's model. The bead, in turn, does work on the optical field, with its effects balanced by an outside heat source. The system's architects admit that their engine tends to "sputter" at times, but insist that its mere development shows that "there are no thermodynamic obstacles" to production. Read more about the invention and its potential implications in the full press release, after the break.
