Articles tagged with Electromagnetic Waves
Researchers at Chalmers University of Technology discovered a speed limit for smart technology gadgets that control light and internet traffic. By manipulating individual particles or allowing speciality materials to remain in motion, they can bypass this limit.
Researchers developed a new model to control chaos in particle accelerators, enhancing efficiency and reducing initial velocity requirements. The transport barrier mechanism, inspired by tokamaks, shows promising results in simulations.
The Van Allen Probes mission has identified local acceleration as the main cause of highly energized ions and electrons in the radiation belts, contrary to previous theories that suggested radial diffusion was the primary driver. This discovery is crucial for improving space weather forecasting models.
Researchers at TU Wien found that coupled atom clouds synchronize spontaneously and oscillate in perfect unison after just a few milliseconds. This effect cannot be explained by standard theories of Bose-Einstein-Condensates, which predict periods of synchronization alternating with de-synchronization.
The new technology can control electromagnetic waves in many different ways by adjusting the size and angle of tiny silicon cylinders within a grid structure. This allows for subwavelength control, faster reconfiguration, and potentially improved security scanners and visual displays.
A team of scientists has proposed a method to boost wireless power transfer over long distances using backward signal transmission. The study, published in Physical Review Letters, demonstrates the effectiveness of this approach in enhancing power transfer efficiency.
Researchers at OIST Graduate University discovered that polarization affects the motion of electrons in a two-dimensional system. By inducing rotation in both electrons and microwave fields, the team observed oscillations in electron current, indicating that electrons are indeed affected by polarization.
Researchers at ITMO University have created a new type of curved light beam called a photonic hook, which can improve optical system resolution and control nanoparticles. The technique uses a dielectric particle to bend the light beam, allowing for the manipulation of individual cells, viruses, or bacteria on a nanoscale.
Physicists develop new method to precisely characterise extremely short light pulses, allowing for detailed information about electron place of origin in novel materials. This enables study of superconductors and topological materials, crucial for quantum computing and energy-efficient processors.
BurstCube will detect gamma-ray bursts caused by massive star collapses and neutron star mergers, as well as solar flares. The mission uses miniaturized detector technology to study these high-energy events and their origins.
A KAUST team has developed a device that can tap into the constant energy emitted by Earth's surfaces and atmosphere, as well as waste heat from industrial processes. The 'rectenna' design uses quantum tunneling to convert infrared waves into useful electricity.
Researchers at Caltech and ETH Zürich created a systematic design method for metamaterials using quantum mechanics. They can engineer materials to manipulate incoming waves, such as bending light or reflecting sound waves. This breakthrough could lead to widespread use of metamaterials in various applications.
Researchers have developed ultra-thin and flat graphene metalenses that can concentrate terahertz beams to a spot, flip their polarization and modulate their intensity. These devices have the potential to revolutionize applications such as amplitude tunable lenses, lasers and dynamic holography.
Researchers mixed electromagnetic waves on a superconducting qubit, enabling the detection of quantum wave mixing. The study could aid in developing new quantum electronics.
Xi-Cheng Zhang and his team have successfully generated terahertz waves from liquid water, a fundamental breakthrough with significant applications in imaging and spectroscopy. The discovery paves the way for non-destructive inspection of objects and potential uses in security screening, medical imaging, and more.
Researchers have developed a new approach to designing antennas that can construct devices with antennas up to 1,000 times smaller than current ones. This technology enables the creation of miniaturized antennas for cell phones and other wireless communication devices, opening up new possibilities in the biomedical field.
Researchers at Poker Flat Research Range in Alaska used high-speed cameras to capture the rare phenomenon of an aurora flickering. The team discovered that faster flickerings occur at speeds of 1/60-1/50 and 1/80 seconds, revealing a complex exchange of energy between plasma waves and particles.
Researchers at MIT have developed a new terahertz laser design that boosts the power output of chip-mounted lasers by 80 percent, opening up new possibilities for medical and industrial imaging and chemical detection. The device has been selected by NASA for its Galactic/Extragalactic ULDB Spectroscopic Terahertz Observatory mission.
Researchers from HSE Centre for Cognition & Decision Making found that training participants using real-time feedback on alpha wave activity significantly increased their ability to control brain state. This new insight may lead to non-pharmacological methods for treating epilepsy, ADHD, and depression.
Physicists at the University of Innsbruck have developed a method to generate ultra-focused electromagnetic fields, enabling precise devices for microscopy and other applications. The new scheme utilizes a cylinder reflecting electromagnetic waves to create focused pulses with adjustable frequency.
A new NASA study using data from the Van Allen Probes spacecraft has discovered that plasmaspheric hiss waves are more complex than previously understood. Low-frequency hiss waves interact with high-energy particles and can efficiently remove them from the radiation belts, protecting satellites.
Researchers from Lomonosov Moscow State University directly measured giant resonant fields in subwavelength dielectric particles, overcoming measurement difficulties by using radio waves. The study provides theoretical explanation and has potential applications in medicine, biology, telecommunications, and optical computing.
Researchers at EPFL challenge fundamental law of physics and discover asymmetric resonant and wave-guiding systems capable of storing large amounts of energy over prolonged periods while maintaining broad bandwidths. The breakthrough has implications for telecommunications, optical detection systems, and broadband energy harvesting.
A recent study by the American Institute of Physics reveals that high-frequency quasi-electrostatic fluctuations in the Earth's radiation belts are driven by hot electrons. These fluctuations allow radiation belt electrons to remain inside the outer Van Allen band for a long time, influencing radiation exposure for orbiting satellites.
A team of researchers has developed a method to completely characterize the evolution of weak electric fields in light pulses. This allows for the measurement of electric field characteristics such as direction, duration, and intensity.
Duke researchers have created 3D-printed electromagnetic metamaterials with potential to revolutionize the design and prototyping of radio frequency applications. The use of a highly conductive material, Electrifi, enables rapid construction of complex devices and accelerates the design process.
Researchers at Princeton University have developed a new terahertz chip technology that can generate and capture intricate details of terahertz waves. The system uses tiny devices inside the microchip to read patterns created by the waves, enabling potential applications in medical imaging, communications, and drug development.
Researchers from NUS develop high-performance and low-power driven THz emitters that can be mass-produced at low cost and function on flexible surfaces. These advancements accelerate the application of THz technology in various fields, including safety surveillance, disease diagnosis and imaging.
Electrical engineers at Duke University have created a metal-free metamaterial that can absorb electromagnetic energy, opening doors for applications in imaging, sensing, and lighting. The device's ability to absorb energy without heating up has direct implications for thermal imaging devices and efficient lighting systems.
Researchers at General Atomics have developed a new tool for controlling fusion plasmas, allowing for separate and continuous specification of power and torque. This breakthrough has the potential to improve magnetic fusion in machines worldwide.
Researchers at Duke University have developed a simple, energy-efficient way to create three-dimensional acoustic holograms using Lego-like metamaterials. The technique manipulates sound waves into desired patterns, enabling applications such as improving sound quality in speakers and creating realistic ultrasound images.
Researchers discovered that ultra-relativistic electrons are scattered into the atmosphere by electromagnetic ion cyclotron waves, while relativistic particles remain intact. This finding resolves a long-standing debate on electron loss mechanisms in the Van Allen Radiation Belts.
Researchers created an ultrasensitive optical microfiber coupler sensor that detects small concentrations of molecules on or near the fiber's surface. The sensor boasts a sensitivity 20 times higher than conventional sensors, making it ideal for trace analyte and small molecule detection.
Researchers at the University of Arizona are pioneering phononics, the science of sound, with potential repercussions in fields like energy, biomedicine, and computing. The team, led by Pierre Deymier, is using unconventional materials to manipulate sound waves in new ways.
Researchers have developed a more robust imaging wave using unconventional laser beams, allowing for the detection of objects at greater distances. The technology has the potential to be used for Homeland Security and law enforcement agencies to detect chemical, biological, and explosive materials without damaging human tissue.
Researchers at Vienna University of Technology and colleagues around the world have discovered exceptional points in wave physics, where complex frequencies emerge. By steering a system around these points, they have observed surprising effects, including asymmetric mode switching.
Researchers at Queen Mary University of London have developed a composite material that can enhance specific properties on an object's surface, allowing curved surfaces to appear flat to electromagnetic waves. This practical demonstration could lead to improved antenna designs and applications in the aerospace industry.
Researchers successfully used terahertz lasers to induce permanent changes in a polymer's conformation, increasing its crystallization pattern by 20%. The study demonstrates the potential of terahertz waves as a 'soft' method for modifying materials without inducing chemical changes.
Engineers at University of Wisconsin-Madison created world's fastest stretchable, wearable integrated circuits, expanding Internet of Things capabilities. These powerful circuits can operate up to 40 GHz and are 25 micrometers thick, enabling biomedical applications like epidermal electronic systems.
The resistivity of carbon nanocoils increases with coil diameter, with a large discrepancy between CNCs and graphitized versions. The interior of the nanocoil contains a highly-disordered carbon network that affects its electrical properties.
Scientists at Washington University in St. Louis use a new instrument to detect light in a way that reveals the atom's evolution and potential control over entangled partners. This approach may enable quantum control and enhance fluorescence imaging.
Using ultrasonic signals, researchers demonstrated the possibility of high-definition video transmission through tissue for in-body communications with implanted medical devices. The study achieved data rates >30Mbps with low error rates, sufficient for real-time streaming.
Researchers have developed a new flexible 'meta-skin' technology that can cloak objects from radar waves using rows of small liquid-metal devices. The meta-skin demonstrates 75% radar suppression in the frequency range of 8 to 10 gigahertz, making it suitable for electromagnetic frequency tuning, shielding and scattering suppression.
Mathematicians Gino Biondini and Dionyssios Mantzavinos develop a new mathematical model describing wave patterns with small irregularities. Their research shows that many disturbances evolve into single-class wave forms, answering a question scientists have been trying to answer for 50 years.
Researchers find that even gases without thermalization can be cooled by removing high-energy particles through electromagnetic fields, and this effect is made possible by quantum mechanical waves.
A new type of conductive concrete has been developed that can melt ice and snow in winter storms while remaining safe to the touch. The concrete is made with a pinch of steel shavings and carbon particles and conducts enough electricity to de-ice roads, reducing the need for salt and chemicals.
Researchers have developed a new way to fully absorb electromagnetic radiation using an anisotropic crystal, hexagonal boron nitride. This breakthrough has significant implications for reducing radar visibility and improving applications in photovoltaics, sensing, nanochemistry, and photodynamic therapy.
The James Webb Space Telescope's Integrated Science Instrument Module passed a test for compatibility with the spacecraft's electromagnetic environment. The test, conducted in an anechoic chamber, aimed to assess the likelihood of interference and ensure the instrument's functionality in space.
NASA will launch two sounding rockets, CAPER and RENU 2, over Norway this winter to study the cusp aurora and particles moving near the North Pole. The rockets will investigate electromagnetic waves accelerating electrons into Earth's atmosphere and the relationship between electron inflow and electric currents.
A Dartmouth-led study investigates the resonance of relativistic electrons with electromagnetic ion cyclotron waves in the Van Allen radiation belts. The findings reveal that low proton temperature is the primary factor influencing the lower minimum resonant energy, contrary to previous assumptions about high density.
Scientists developed a more general approach for controlling acoustic scattering on complex, odd-shaped objects using a coating of two thin fluid layers. The coating significantly reduces the scattering strength, allowing for ideal acoustic measurements in laboratories.
Researchers developed a novel method to confine light, allowing for the retention of quantum memories encoded in photons. This breakthrough could lead to hybrid devices using quantum information for communication networks or quantum computing.
Researchers have discovered an iron-gallium alloy called Galfenol that can generate significant amounts of power when subjected to strong impacts. The material converts mechanical energy into magnetic energy with high efficiency and can be used to create wireless impact detectors.
Researchers at Lomonosov Moscow State University develop a sphere that manipulates electromagnetic radiation on scales shorter than its wavelength, enabling faster photonic devices. The sphere's interaction with light produces a resonance similar to plasmonics, but with weaker damping, making it suitable for various applications.
Scientists have made significant progress in overcoming the challenges of creating a perfect lens using metamaterials. The team proposes a novel approach that utilizes negative index materials and plasmon-injection schemes to shield desired light waves, allowing them to pass through unscathed. This breakthrough has the potential to rev...
Scientists at the University of California - San Diego have designed a new type of cloak that is both thin and does not alter the brightness of light around a hidden object. The technology behind this cloak has more applications than invisibility, such as concentrating solar energy.
The Karlsruhe Institute of Technology (KIT) has secured funding for two collaborative research centers (CRCs): one focused on wave phenomena in mathematics and the other on enhancing weather forecasting. The CRCs aim to analytically understand, numerically simulate, and manipulate wave propagation under realistic scenarios.
UTSA College of Sciences faculty members Stephen Ackley and Blake Weissling will embark on a 42-day trip to the Arctic Ocean to study the diminishing ice cover. They will join a team of scientists from around the world, including UTSA students who have conducted ice research in the region before.
Scientists have created a more efficient way to generate broadband terahertz radiation by using a microplasma in air, which can be used for applications such as monitoring explosives or drugs. The approach uses lower power lasers and can provide higher spectral resolution, enabling clearer identification of materials.
A team of researchers from the University of Waterloo has developed a novel design for electromagnetic energy harvesting based on the full absorption concept, which enables the collection of essentially all electromagnetic energy that falls onto a surface. This technology has vast applications in space solar power and wireless power tr...