OpticalComputers
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Optical 'diode' lends hope to photonic computing, rayguns
The trouble with pesky Photon, at least as far as ultra-fast optical computing is concerned, is that he keeps coming back. If a data-carrying beam of light collides with reflections bouncing around between the components of a chip, it can suffer enough interference to make people yearn for the good old days of electrons. What's needed is the optical equivalent of a diode, which only allows light to pass one way, and that's exactly what researchers at Caltech and the University of California claim to have developed. As you'll see in the photo after the break, their metallic-silicon optical waveguide allows light to travel smoothly from left to right, but it breaks up and dissipates any photons traveling in the opposite direction. This is all good, because there's no point having futuristic 50Gbps optical interconnects if our CPUs lag behind. Light up the source link for a fuller explanation.
Researchers find ways to squeeze light into spaces never thought possible
It looks like a team of UC Berkeley researchers led by mechanical engineering professor Xiang Zhang (pictured) have found a way to squeeze light into tighter spaces than ever though possible, which they say could lead to breakthroughs in the fields of optical communications, miniature lasers, and optical computers. The key to this new technique, it seems, is the use of a "hybrid" optical fiber consisting of a very thin semiconductor wire placed close to a smooth sheet of silver, which effectively acts as a capacitor that traps the light waves in the gap between the wire and the metal sheet and lets it slip though spaces as tiny as 10 nanometers (or more than 100 times thinner than current optical fibers). That's apparently as opposed to previous attempts that relied on surface plasmonics, in which light binds to electrons and allows it to travel along the surface of metal, which only proved effective over short distances. While all of this is still in the theoretical stage, the researchers seem to think they're on to something big, with research associate Rupert Olten saying that this new development "means we can potentially do some things we have never done before.
