Researchers at NIST have developed a new computational method for identifying candidate refrigerant fluids with low global warming potential—the tendency to trap heat in the atmosphere for many decades—as well as other desirable performance and safety features. The NIST effort is the most extensive systematic search for a new class of refrigerants that meet the latest concerns about climate change.
An international team of researchers have demonstrated a microscopy method to identify magnetic defects in an array of magnetic nanostructures. The method represents an important step towards identifying, measuring, and correcting the magnetic properties of defective devices in future information storage technologies.
NIST unveiled a new laboratory designed to demonstrate that a typical-looking suburban home for a family of four can generate as much energy as it uses in a year. Following an initial year-long experiment, the facility will be used to improve test methods for energy-efficient technologies and develop cost-effective design standards for energy-efficient homes that could reduce overall energy consumption and harmful pollution, and save families money on their monthly utility bills.
The world's most stable laser—with frequency variation of no more than 2 parts in 10,000 trillion—has been developed and tested by an international collaboration of scientists at NIST/JILA in Boulder, Colo., and a group at Physikalisch-Technische Bundesanstalt, the German counterpart of NIST. The work represents a new approach for constructing high-quality cavities that will bring more than an order of magnitude improvement over prior designs.
Researchers from the NIST Center for Nanoscale Science and Technology have demonstrated a low-noise device for changing the wavelength of light using nanofabricated waveguides created on a silicon-based platform using standard planar fabrication technology.
A refined method developed at NIST for measuring nanometer-sized objects may help computer manufacturers more effectively size up the myriad tiny switches packed onto chips' surfaces. The method, which makes use of multiple measuring instruments and statistical techniques, is already drawing attention from industry.
Researchers at NIST's Physical Measurement Laboratory have devised a novel source of portable sunlight that may fill an urgent need in renewable energy research—namely, light sources that generate a near-perfect solar spectrum to be used in testing the performance and efficiency of photovoltaic materials.
NIST Center for Nanoscale Science and Technology researchers have determined the optimum path in which to scan a laser beam in order to track a fluorescing nanoparticle as the particle moves inside a fluid or gas in two or three dimensions.
Take that, sports cars! Physicists at NIST can accelerate their beryllium ions from zero to 100 mph and stop them in just a few microseconds. What's more, the ions come to a complete stop and hardly feel the effects of the ride. And they're not just good for submicroscopic racing—NIST physicists think their zippy ions may be useful in future quantum computers.
Cartridge cases—the empty shells left behind after a gun is fired—are routinely sent to forensic laboratories for analysis when they're found at a shooting scene. Forensics experts need to have confidence in the accuracy of the equipment and procedures used to make a link, which makes the new standard reference material from NIST a valuable tool for law enforcement.
Most devices that amplify light suffer from the same problem: making the image brighter also adds muddying distortion. Scientists working at NIST have demonstrated that they can amplify weak light signals without adding noise while also carrying more information—more pixels—than other low-noise amplifiers.
Tests performed at NIST show that a new method for splitting photon beams could overcome a fundamental physical hurdle in transmitting electronic data. The findings confirm that a prototype device developed with collaborators at Stanford University can double the amount of quantum information that can be sent readily through fiber-optic cables, and in theory could lead to an even greater increase in the rate of this type of transmission.
A detailed understanding of how colloidal nanoparticles interact with interfaces is essential for designing them for specific applications in fields ranging from drug delivery to oil exploration and recovery. NIST scientists have recently used 3D single-particle tracking to measure the dynamic behavior of individual nanoparticles adsorbed at the surface of micrometer-scale oil droplets in water, and have discovered how they diffuse.
A new versatile measurement system devised by researchers at NIST accurately and quickly measures the electric power output of solar energy devices, capabilities useful to researchers and manufacturers working to develop and make next-generation solar energy cells.
A team of researchers from the University of Delaware and two national laboratories have developed a new scientific instrument capable of studying the microstructure of complex fluids, polymers, nanomaterials, and surfactant solutions using neutron scattering techniques. The advance adds the ability for researchers to study time-dependent deformations, a capability not previously available.
Gold is not necessarily precious—at least not as a coating on atomic force microscope (AFM) probes. JILA researchers found that removing an AFM probe's gold coating—until now considered helpful—greatly improved force measurements performed in a liquid, the medium favored for biophysical studies such as stretching DNA or unfolding proteins.
In an important step towards more practical quantum information processing, researchers have demonstrated the first heralded single photon source made from silicon. This source complements two other recently developed silicon-based technologies—interferometers for manipulating the entanglement of photons and single photon detectors—needed to build a quantum optical circuit or a secure quantum communication system.
In searching for better flame retardants for home furnishings, NIST researchers defied the conventional wisdom and literally hit a wall, one made of clay. It wasn't a dead end, but rather a surprising result that may lead to a new generation of nonhalogenated, sustainable flame retardant technology for polyurethane foam.
Tightening or relaxing the tension on a drumhead will change the way the drum sounds. The same goes for drumheads made from graphene, only instead of changing the sound, stretching graphene has a profound effect on the material's electrical properties. Researchers working at NIST and the University of Maryland have shown that subjecting graphene to mechanical strain can mimic the effects of magnetic fields and create a quantum dot.
NIST researchers have observed for the first time the Hall effect in a gas of ultracold atoms. The Hall effect is an important interaction of magnetic fields and electric current more commonly associated with metals and semiconductors. Variations on the Hall effect are used throughout engineering and physics with applications ranging from automobile ignition systems to fundamental measures of electricity. The new discovery could help scientists learn more about the physics of quantum phenomena such as superfluidity and the quantum Hall effect.
Generated by ultrafast lasers, frequency combs precisely measure individual frequencies (colors) of light. Researchers at JILA, operated jointly by NIST and the University of Colorado-Boulder, are using such a comb to identify specific molecules in gases based on which colors of light, or comb "teeth," are absorbed by the gas, and in what amounts.
A trio of theorists, including one from the NIST, have described how a future quantum computer could be used to simulate complex, high-energy collisions of subatomic particles. Given a working quantum computer—still under development—the algorithm could solve important physics problems well beyond the reach of even the most powerful conventional supercomputers.
A powerful color-based imaging technique is making the jump from remote sensing to the operating room—and a team of scientists at NIST have taken steps to ensure it performs as well when discerning oxygen-depleted tissues and cancer cells in the body as it does with oil spills in the ocean.
An international research team led by the University of Colorado-Boulder has generated the first laser-like beams of X-rays from a tabletop device, paving the way for advances in many fields including medicine, biology, and nanotechnology development.
Quantum computers are still years away, but a trio of theorists has already figured out at least one talent they may have. According to the theorists, physicists might one day use quantum computers to study the inner workings of the universe in ways that are far beyond the reach of even the most powerful conventional supercomputers.