Optical circuits use light instead of electricity, making them faster and more energy-efficient than electrical systems. Scientists in Switzerland have now developed a silicon-based photonic crystal nanocavity to be used as a first building-block for photonic “transistors”. The new device requires record low energy to operate.
The invention of fiber optics revolutionized the way we share information, allowing us to...
To make a better optical fiber for transmitting laser beams, the first idea that comes to mind...
Scientists in the U.K. recently published work that describes how graphene can be wrapped around a silicon wire, or waveguide, and modify the transmission of light through it. These waveguide loops, called “racetrack resonators” because of their shape, could help form a device architecture that would make graphene biochemical sensors a reality.
A new home-grown instrument based on bundles of optical fibers is giving Australian astronomers the first “Google street view” of the cosmos—incredibly detailed views of huge numbers of galaxies. Developed by researchers at the Univ. of Sydney and the Australian Astronomical Observatory, the optical-fiber bundles can sample the light from up to 60 parts of a galaxy, for a dozen galaxies at a time.
Scientists in Belgium have recently fabricated the world’s first randomly deformable optical waveguide. This innovative optical link remains functional for bending radii down to 7 mm, and can be stretched to more than a third of its length. A link like this can be used to interconnect optical components within a stretchable system, just like stretchable electrical interconnections.
Nonlinear optical materials are widely used in laser systems, but they require high light intensity and long propagation to be effective. A team in Germany and Texas has designed a new 400-nm thick nonlinear mirror that delivers frequency-doubled output using input light intensity as small as that of a laser pointer. Compared to traditional nonlinear materials, the new option offers a million times increase in nonlinear optical response.
By fusing together the concepts of active fiber sensors and high-temperature fiber sensors, a team of researchers at the Univ. of Pittsburgh has created an all-optical high-temperature sensor for gas flow measurements that operates at record-setting temperatures above 800 C. The new technology should be ideal for use in deep drilling operations, nuclear reactor cores and outer space.
A team of scientists in Japan and New Zealand have combined lasers, nanotechnology, and neuroscience to develop a new, versatile drug delivery system. The precise timing of a femtosecond laser is used to release dopamine, a neurochemical, that is dysfunctional in Parkinson’s Disease in a controlled and repeatable manner that mimics the natural dynamic release mechanism.
A proposed hybrid quantum processor for a future quantum computer uses trapped atoms as the memory and superconducting qubits as the processor. The concept requires, however, an optical trap that is able to work well with superconductors, which don’t like magnetic fields or high optical power. Joint Quantum Institute scientists believe they’ve developed an effective method for creating these ultra-high transmission optical nanofibers.
Crystal IS has introduced Optan, the first commercial semiconductor based on native aluminum nitride (AIN) substrates. Optan increases detection sensitivity from monitoring of chemicals in pharma manufacturing to drinking water analysis.
With precarious particles called polaritons that straddle the worlds of light and matter, Univ. of Michigan researchers have demonstrated a new, practical and potentially more efficient way to make a coherent laser-like beam. They have made what's believed to be the first polariton laser that is fueled by electrical current as opposed to light, and also works at room temperature, rather than way below zero.
Researchers at the Univ. of Adelaide in South Australia have created a thermometer three times more precise than any existing device, able to measure temperature to 30 billionths of a degree. Using the phenomenon called a “whispering gallery”, which projects sounds, the scientists have designed a crystalline disk that concentrates and reinforces light, allowing them to track a minute difference in speed between red light and green light.
Researchers in Spain have introduced a platform technology based on optical antennas for trapping and controlling light with graphene. Their experiments show that the dramatically squeezed graphene-guided light can be focused and bent, following the fundamental principles of conventional optics. The work opens new opportunities for smaller and faster photonic devices and circuits.
Of all the electricity generated in the U.S., more than quarter is consumed by lighting. In 2010, North Carolina’s RTI International launched a new product, NLite, intended to help alleviate this burden by improving the reflectance performance of power-intensive lighting devices such as luminaires and liquid crystal displays. The technology, based on nanofiber reflectance polymers, won a 2011 R&D 100 Award.
A popular technique for studying single molecules is optical trapping. This is a traditionally delicate process, requiring special equipment, a soundproof room and patience as data collected one molecule at a time. Physicists have now shrunk the technology of an optical trap onto a single chip. Instead of just one molecule at a time, the new device can potentially trap hundreds of molecules at once, reducing month-long experiments to days.
Researchers in Spain have developed a highly fluorescent hybrid material that changes color depending on the polarization of the light that it is illuminated by. They achieved this with a perfect fit between an inorganic nanostructure and dye molecules.
Although it is relatively cheap and easy to encode information in light for fiber optic transmission, storing information is most efficiently done using magnetism, which ensures information will survive for years without any additional power. But a new proposal by researchers would replace silicon used in these devices with plastic. Their solution converts magnetic information to light in a flexible plastic device.
In a recent demonstration by researchers in Europe, miniaturized optical frequency comb sources allow for transmission of data streams of several terabits per second over hundreds of kilometers. The results, which showed a data rate of 1.44 TB/sec over 300 km, may contribute to accelerating data transmission in large computing centers and worldwide communication networks.
For optical communication to happen, it is essential to convert electrical information into light, using emitters. On the other end of the optical link, one needs to translate the light stream into electrical signals using detectors. Current technologies use different materials to realize these two distinct functions, but this might soon change thanks to a new discovery by researchers at IBM.
Hundreds of Tetris fans who had a little fun Saturday with a big version of the classic video game on the side of the 29-story Cira Centre in Philadelphia. LED lights embedded in the building's glass facade normally display colorful patterns. On Saturday night, images of super-sized shapes "fell" on two sides of the mirrored tower as competitors used joysticks to maneuver them, creating a spectacle against the night sky.
Using an acoustic metadevice that can influence the acoustic space and can control any of the ways in which waves travel, engineers have demonstrated, for the first time, that it is possible to dynamically alter the geometry of a 3-D colloidal crystal in real time. The crystals designed in the study, called metamaterials, are artificially structured materials that extend the properties of naturally occurring materials and compounds.
Commercial demand is driving high-tech research and development in micro-optoelectromechanical systems (MOEMS) for diverse applications such as space exploration, wireless systems, and healthcare. A new special section on Emerging MOEMS Technology and Applications in the current issue of the Journal of Micro/Nanolithography, MEMS, and MOEMS discusses these recent breakthrough achievements.
An ultra-fast and ultra-small optical switch has been invented that could advance the day when photons replace electrons in the innards of consumer products ranging from cell phones to automobiles. The new optical device can turn on and off trillions of times per second and consists of tiny individual switches made of a metamaterial that uses vanadium dioxide.
Imagine that you are in a meeting with coworkers or at a gathering of friends. You pull out your cell phone to show a presentation or a video on YouTube. But you don't use the tiny screen; your phone projects a bright, clear image onto a wall or a big screen. Such a technology may be on its way, thanks to a new light-bending silicon chip developed by researchers at the California Institute of Technology.
Using an inexpensive inkjet printer, Univ. of Utah electrical engineers produced microscopic structures that use light in metals to carry information. This new technique, which controls electrical conductivity within such microstructures, could be used to rapidly fabricate superfast components in electronic devices, make wireless technology faster or print magnetic materials.
After having recently discovered a new way to propagate multiple beams of light through a single strand of optical fiber, engineers at the Univ. of Wisconsin-Milwaukee now have found that their novel fiber architecture can transmit images with a quality that is comparable or better than the current commercial endoscopy imaging fibers.
Associated with unhappy visits to the dentist, “cavity” means something else in the science of optics. An arrangement of mirrors that allows beams of light to circulate in closed paths, or cavities, help us build laser and optical fibers. Now, a research team pushed the concept further by developing an optical “nanocavity” that boosts the amount of light that ultrathin semiconductors absorb.
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