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Metamaterials

Science

Inexpensive 3D-printed lens gives terahertz imaging a boost

Terahertz radiation is a growing field of technology that enables faster materials analysis than X-ray examination, and provides non-destructive, internal analysis of a raft of different types of materials. Now researchers have developed a way of manufacturing lenses operating at this frequency that are simple and inexpensive, but are claimed to produce near-flawless images which could vastly improve biomedical imaging as well as biological and explosive security scanning.Read More

Materials

Meta-skin could lead to invisibility cloak

Engineers at Iowa State University may have gotten one step closer to the ability to make objects invisible with the development of what they are calling a flexible, stretchable and tunable meta-skin. They have shown that objects wrapped in the meta-skin can suppress radar detection, and they are hoping to advance the material to eventually make objects undetectable to both visible and infrared light.Read More

Materials

Acoustic metasurface design completely absorbs low frequency sound

Absorbing low frequency sound is a big job, or at least, a job for big things. Acoustic absorption systems require big resonant cavities with large amounts of heavy damping material and significant surface areas to work efficiently. Consequently, the sound-deadening systems used in music studios and anechoic chambers take up a lot of room. Now scientists have flipped this notion on its head by designing coiled metasurfaces that not only completely absorb low frequency sounds, but are a tiny fraction of the size of traditional sound-absorbing systems.Read More

Materials

Nanoscale lattice is world's smallest

Scientists from Karlsruhe Institute of Technology have created a tiny lattice they claim is the world's smallest. Formed with struts and braces measuring less than 10 micrometers in length and less than 200 nanometers in diameter, the 3D lattice has a total size of less than 10 micrometers, but boasts a higher specific strength than most solids.Read More

Medical

MRIs could soon be quicker and safer

While MRI scans may not expose patients to the ionizing radiation found in X-rays, they still are potentially harmful. This is because the increased radiofrequency energy absorption associated with newer high-field and ultra-high-field MRI scanners can heat body tissue. Thanks to research being conducted at the Australian National University, however, that may soon no longer be an issue – additionally, scans could be quicker and produce higher-quality images.Read More

Physics

New invisibility cloak hides tiny three-dimensional objects of any shape

Scientists at UC Berkeley have developed a foldable, incredibly thin invisibility cloak that can wrap around microscopic objects of any shape and make them undetectable in the visible spectrum. In its current form, the technology could be useful in optical computing or in shrouding secret microelectronic components from prying eyes, but according to the researchers involved, it could also be scaled up in size with relative ease.Read More

Science

Ultrathin metasurface lenses do things conventional optics can't

Once, the only way to manipulate light was with the use of a transparent glass or plastic lens whose shape and makeup determined such things as focus, magnification, and polarity. However, to incorporate all of these properties in the one optical system required a large and complex collection of multiple lenses to achieve. Now researchers working at NASA's Jet Propulsion Laboratory (JPL) and the California Institute of Technology (Caltech) have created a flat silicon metamaterial lens that manages all of these thing in a microminiaure device that electromagnetically controls the properties of any light passing it.Read More

Electronics

Sensor detects sound direction and cuts background noise

Although the ability tends to wane as we get older, the human auditory system is pretty good at filtering out background noise and making a single voice able to be understood above the general hubbub of a crowded room. But electronic devices, such as smartphones, aren't quite as gifted, which is why getting Siri or Google Now to understand you in crowded environments can be an exercise in futility. But now researchers have developed a prototype sensor that’s not only able to figure out the direction of a particular sound, but can also extract it from background noise.

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Physics

Hyperlens significantly boosts image resolution of microscopic objects

Using visible light magnified through a compound series of lenses to image small objects, standard optical microscopes have been with us for many centuries. Whilst continually being improved, the result of these many advances of optics and image-capturing techniques means that many high-end optical microscopes have now reached the limit of magnification possible as they push the resolution properties of light itself. In an attempt to resolve this issue, scientists at the University of Buffalo (UB) have created a prototype visible light "hyperlens" that may help image objects once only clearly viewable through electron microscopes.Read More

Science

Metamaterials allow ultrasound to penetrate bone and metal

Score another point for metamaterials. Researchers at North Carolina State University have designed complementary metamaterials that will aid medical professionals and engineers in diagnosing problems under the skin. These metamaterials are structured to account for so-called "aberrating layers" that block or distort the acoustic waves used in ultrasounds, making it possible to now conduct ultrasounds of a person's head or an airplane's wing – among other things.Read More

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