Current Metamaterials News and Events | Page 4

Current Metamaterials News and Events, Metamaterials News Articles.
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Growth under pressure: New metamaterial designed with counterintuitive property
Inspired by 3-D printing, researchers explored development of one mechanical property called effective static compressibility. As they now report in Applied Physics Letters, by using a single cartridge it's possible to print a metamaterial which expands in size under hydrostatic pressure, even though it's made up of material which behaves normally under hydrostatic pressure -- that is, it shrinks. In principle, there is no limit to the negative value this material's effective compressibility can take. (2017-04-24)

New infrared-emitting device could allow energy harvesting from waste heat
A new reconfigurable device that emits patterns of thermal infrared light in a fully controllable manner could one day make it possible to collect waste heat at infrared wavelengths and turn it into usable energy. (2017-04-13)

Gold-plated crystals set new standard for natural gas detectors
Materials scientists and engineers have developed a sensor that is fast, sensitive and efficient enough to detect specific wavelengths of electromagnetic energy while on the move. The technology could actively scan areas for methane or natural gas leaks, monitor the health of vast fields of crops or quickly sort plastics for recycling. (2017-04-06)

Legos and origami inspire next-generation materials
Inspired by the fun of playing with Legos, an international team of researchers from Tianjin University of Technology and Harvard University have used the idea of assembling building-blocks to make the promise of next-generation materials a practical reality. (2017-03-28)

Terahertz wave -- evaluate emergency measures during red alert period
Beijing Municipal Environmental Protection Bureau announced the first-ever red alert for smog in China on Dec. 7, 2015. PM2.5 monitoring of both concentrations and the sources of pollutants is of great significance for environmental departments and the public. Recently, scientists employed terahertz spectroscopy to investigate PM2.5 collected during the red alert period and in a haze condition without red alert. Sulfate types were different and metallic oxides were absent during the red alert period. (2017-03-13)

Guiding light: Sandia creates 3-D metasurfaces with optical possibilities
The new Sandia metamaterials can be fabricated in multiple layers to form complex, three-dimensional meta-atoms that reflect more light than shiny gold surfaces, usually considered the ultimate in infrared reflectivity. The III-V materials also emit photons when excited -- something that silicon, which can reflect, transmit and absorb -- can't do. (2017-03-09)

Penn engineers' 'photonic doping' makes class of metamaterials easier to fabricate
By carefully combining multiple structures, metamaterials can exhibit properties that don't naturally exist. Penn Engineering's Nader Engheta has a new, simpler way of making them, using a concept dubbed 'photonic doping.' (2017-03-09)

MIPT physicists predict the existence of unusual optical composites
Artificial regular structures, photonic crystals and metamaterials can exhibit rather unusual optical properties, which dramatically differ from the properties of natural crystals. Metamaterials can have a negative refractive index and be strongly optically anisotropic. The new article by Alexey Shcherbakov and Andrey Ushkov bridges the gap between natural crystals and the mentioned artificial photonic materials, and describes optical composites which on the one hand cannot be described within the scope of classical crystallography, and on the other hand are not traditional photonic crystals or metamaterials. (2017-03-09)

Chiral metamaterial produces record optical shift under incremental power modulation
Georgia Institute of Technology researchers have demonstrated an optical metamaterial whose chiroptical properties in the nonlinear regime produce a significant spectral shift with power levels in the milliwatt range. (2017-02-28)

Sound-shaping super-material invented
A super-material that bends, shapes and focuses sound waves that pass through it has been invented by scientists. (2017-02-27)

'Lossless' metamaterial could boost efficiency of lasers and other light-based devices
Engineers at the University of California San Diego have developed a material that could reduce signal losses in photonic devices. The advance has the potential to boost the efficiency of various light-based technologies including fiber optic communication systems, lasers and photovoltaics. (2017-02-17)

'Field patterns' as a new mathematical object
University of Utah mathematicians propose a theoretical framework to understand how waves and other disturbances move through materials in conditions that vary in both space and time. The theory, called 'field patterns,' published today in Proceedings of the Royal Society A. (2017-02-14)

New mechanical metamaterials can block symmetry of motion, findings suggest
Engineers and scientists at The University of Texas at Austin and the AMOLF institute in the Netherlands have invented the first mechanical metamaterials that easily transfer motion effortlessly in one direction while blocking it in the other. (2017-02-13)

Most stretchable elastomer for 3-D printing
Researchers have developed a family of highly stretchable and UV curable (SUV) elastomers that can be stretched by up to 1100%, and are suitable for UV curing based 3-D printing techniques. Using high resolution 3-D printing with the SUV elastomer compositions enables the direct creation of complex 3-D lattices or hollow structures that exhibit extremely large deformation. Fabrication time for such SUV elastomers is also greatly reduced. (2017-02-08)

Absorbing electromagnetic energy while avoiding the heat
Electrical engineers at Duke University have created the world's first structured metamaterial made without metal that can absorb electromagnetic energy. The advance has direct applications in imaging, sensing and lighting. (2017-01-27)

New metamaterial can switch from hard to soft -- and back again
When a material is made, you typically cannot change whether that material is hard or soft. But a group of University of Michigan researchers have developed a new way to design a 'metamaterial' that allows the material to switch between being hard and soft without damaging or altering the material itself. (2017-01-23)

A toolkit for transformable materials
Harvard researchers have developed a general framework to design reconfigurable metamaterials. The design strategy is scale independent, meaning it can be applied to everything from meter-scale architectures to reconfigurable nano-scale systems such as photonic crystals, waveguides and metamaterials to guide heat. (2017-01-18)

Turning your living room into a wireless charging station
Researchers demonstrate that the technology already exists to produce a wireless power transfer system similar to a flat-screen TV that could remotely charge any device within its line of sight. (2017-01-04)

Magnetic mirror could shed new light on gravitational waves and the early universe
Researchers have created a new magnetic mirror-based device that could one day help cosmologists discover new details about ripples in space-time known as gravitational waves, particularly those emitted when the universe was extremely young. (2016-12-13)

Researchers create hidden images with commercial inkjet printers
Researchers have developed a way to use commercial inkjet printers and readily available ink to print hidden images that are only visible when illuminated with appropriately polarized waves in the terahertz region of the electromagnetic spectrum. The inexpensive method could be used as a type of invisible ink to hide information in otherwise normal-looking images. (2016-12-08)

Metamaterials open up entirely new possibilities in optics
Researchers at Chalmers University of Technology have developed a method that enables them to manipulate light to follow any predetermined path along a surface. The innovation has now been described as one of the world's 30 most exciting discoveries within optics and photonics during 2016. (2016-11-29)

A new technique for structural color, inspired by birds
Structural coloration has long interested researchers and engineers because of its durability and potential for application in solar arrays, biomimetic tissues and adaptive camouflage. But today's techniques to integrate structural color into materials are time-consuming and costly. Now, researchers have developed a new, more robust and cost effective system to build large-scale metamaterials with structural color. (2016-11-28)

Aviation enhancements, better biosensors could result from new sensor technology
Piezoelectric sensors measure changes in pressure, acceleration, temperature, strain or force and are used in a vast array of devices important to everyday life. However, these sensors often can be limited by the 'white noise' they detect that can give users false readings. Now, a University of Missouri College of Engineering research team has developed methods to enhance piezoelectric sensing capabilities. Enhanced sensors could be used to improve aviation, detect structural damage in buildings and bridges, and boost the capabilities of health monitors. (2016-11-23)

New math tools for new materials
University of Utah mathematician Graeme Milton presents a new tool for understanding how energy waves move through complex materials, opening up possibilities to design materials that absorb or bend energy as desired. (2016-11-21)

Semiconductor-free microelectronics are now possible, thanks to metamaterials
Engineers at the University of California San Diego have fabricated the first semiconductor-free, optically-controlled microelectronic device. Using metamaterials, engineers were able to build a microscale device that shows a 1,000 percent increase in conductivity when activated by low voltage and a low power laser. The discovery paves the way for microelectronic devices that are faster and capable of handling more power, and could also lead to more efficient solar panels. (2016-11-08)

Metamaterial device allows chameleon-like behavior in the infrared
An electric current will not only heat a hybrid metamaterial, but will also trigger it to change state and fade into the background like a chameleon in what may be the proof-of-concept of the first controllable metamaterial device, or metadevice, according to a team of engineers. (2016-10-27)

3-D-printed structures shrink when heated
Engineers from MIT, the University of Southern California, and elsewhere are now adding to the class of heat-shrinking materials. The team, led by Nicholas X. Fang, an associate professor of mechanical engineering at MIT, has manufactured tiny, star-shaped structures out of interconnected beams, or trusses. The structures, each about the size of a sugar cube, quickly shrink when heated to about 540 degrees Fahrenheit (282 C). (2016-10-25)

Lego-like wall produces acoustic holograms
Research Triangle engineers have developed a simple, energy-efficient way to create three-dimensional acoustic holograms. By printing plastic blocks containing spirals of differing densities and stacking them in a calculated way, sound waves can be slowed by differing amounts and shaped to fit any wave-front wanted. The technique could revolutionize applications ranging from home stereo systems to medical ultrasound devices. (2016-10-14)

Metamaterial uses light to control its motion
Researchers have designed a device that uses light to manipulate its mechanical properties. The device, which was fabricated using a plasmomechanical metamaterial, operates through a unique mechanism that couples its optical and mechanical resonances, enabling it to oscillate indefinitely using energy absorbed from light. (2016-10-10)

How to control polarization of light
A group of physicists from the Lomonosov Moscow State University and Toyohashi University of Technology (Japan) has developed a method of ultrafast control of the light's polarization. According to the scientists, this opens up new prospects for optical information processing systems, including the creation of light computers, which operate exclusively photons instead of electrons. The article dwelling on the specifics of this technique was published in the latest issue of Physical Review Applied. (2016-10-03)

Seismic shield: Large-scale metamaterials combat earthquakes in 3-D model
Numerical analysis considers both surface and guided waves, accounts for soil dissipation, and provides design guidelines for implementing earthquake protection using an array of ground-based cavities. (2016-08-24)

Research team wins $2 million NSF EFRI grant to explore non-reciprocal elastic wave propagation
A University of Washington mechanical engineering professor will explore non-reciprocal elastic wave propagation in solid-state media through a new four-year, $2 million Emerging Frontiers in Research and Innovation grant from the National Science Foundation. (2016-08-19)

Scientists count microscopic particles without microscope
Scientists from Russia and Australia put forward a simple new way of counting microscopic particles in optical materials. A laser beam passing through such a material splits and forms a pattern of numerous bright spots on a projection screen. The researchers found that the number of these spots corresponds to the number of particles in the material. This finding allows to determine the material structure without resorting to microscopy. The work was published in Scientific Reports. (2016-08-09)

Shape-changing metamaterial developed using Kirigami technique
Engineers from the University of Bristol have developed a new shape-changing metamaterial using Kirigami, which is the ancient Japanese art of cutting and folding paper to obtain 3-D shapes. (2016-08-05)

New metamaterials can change properties with a flick of a light-switch
Invisibility cloaks have less to do with magic than with metamaterials. These human-engineered materials have properties that don't occur in nature, allowing them to bend and manipulate light in weird ways. For example, some of these materials can channel light around an object so that it appears invisible at a certain wavelength. Now researchers have designed a new kind of metamaterial whose properties can be changed with a flick of a switch. (2016-08-02)

Flexible building blocks of the future
A discovery by Tel Aviv University researchers may lead to more close-fitting, comfortable and user-friendly prosthetics. (2016-07-29)

Attosecond physics: Mapping electromagnetic waveforms
Munich physicists have developed a novel electron microscope that can visualize electromagnetic fields oscillating at frequencies of billions of cycles per second. (2016-07-22)

Researchers determine fundamental limits of invisibility cloaks
The researchers' theory confirms that it is possible to use cloaks to perfectly hide an object for a specific wavelength, but hiding an object from an illumination containing different wavelengths becomes more challenging as the size of the object increases. (2016-07-05)

Superheroes are real
Scientists demonstrated the effect of the all-optical switching between streams of photons using non-linear metamaterials. The Lomonosov Moscow State University staff planned the whole study, conducted calculations and experiments, while their German colleagues made samples of metamaterials. (2016-06-23)

Roland Wiesendanger and Xiang Zhang awarded Julius Springer Prize for Applied Physics 2016
This year's Julius Springer Prize for Applied Physics for outstanding research in materials science and its applications will be awarded to Roland Wiesendanger (Hamburg) and Xiang Zhang (Berkeley, Calif.). The award, accompanied by US$ 5,000, will be presented to the scientists at the Haus der Patriotischen Gesellschaft in Hamburg on May 27, 2016, during the Julius Springer Forum on Applied Physics. (2016-05-12)

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