Articles tagged with Electromagnetic Radiation
Researchers developed a theoretical framework explaining unusual conduction behavior in magnetic materials. Quantum fluctuations affect electron transport in chiral magnets, leading to logarithmic temperature dependence at low temperatures.
Scientists create a moiré metasurface to map right- and left-handed regions in materials, visualizing chirality as two-dimensional images. The new approach resolves chirality distributions with a resolution of approximately 100 μm.
Researchers demonstrate a route to generating twisted light beams by combining dielectric multilayers with patterned metallic surfaces. The approach converts surface-bound light waves into free-space beams with controlled angular momentum and polarization, avoiding limitations of earlier designs.
Researchers at the University of Pennsylvania have developed HoloRadar, a system that enables robots to reconstruct hidden 3D spaces beyond their line of sight using radio waves processed by AI. This capability can improve safety and performance in driverless cars and cluttered indoor settings.
Researchers develop a rigid organic crystal that emits red light under UV irradiation through excimer formation and generates green light through second harmonic generation under near-infrared exposure. The dual-mode optical behavior operates independently within the same crystal without interference.
Southwest Research Institute has upgraded its nuclear magnetic resonance (NMR) laboratory to provide robust chemical analysis of organic compounds used in drug discovery and development. The new facility enables rapid and cost-effective analysis using qNMR, which can be more efficient than HPLC for certain applications.
Researchers conducted two triple-blind human studies using real 5G signals in the 26 GHz band, finding no measurable biological effects on stress responses or brain electrical activity. Cortisol and alpha-amylase levels remained stable across all sampling points, indicating no acute biological changes related to stress.
Researchers at Rice University have developed a new method to generate radio wave patterns that can identify signal direction with unprecedented accuracy, enabling rapid establishment of wireless links. This breakthrough enables high data-rate links to form almost as soon as the signal is sent.
Researchers found that heat transfer values increase dramatically at distances less than ten nanometres, exceeding theoretical predictions by a factor of one hundred. This phenomenon challenges current understanding of heat transfer in the nanometre range.
Scientists have created nanoparticles that convert near-infrared radiation into blue or UV light, enabling efficient powering of molecular motors. This breakthrough solves a significant problem in real-life applications, allowing bulk materials to respond or act as molecular switches in biological settings.
Researchers at Cavendish Laboratory create ultra-small, tuneable capacitors from graphene to achieve high modulation depths and fast speeds in terahertz modulators. The devices surpass existing modulator technologies with unprecedented intensity modulation depth and speed.
Research suggests that airport radar systems and military operations can inadvertently reveal our existence to potential advanced alien civilizations due to hidden electromagnetic leakage. Worldwide aviation hubs like Heathrow and Gatwick emit signals strong enough to be detected by telescopes up to 200 light-years away.
Astronomers detect first-ever evidence of a 'planet with a death wish' as HIP 67522 b orbits extremely close to its host star, triggering flares that erode the planet's atmosphere. The radiation is so intense it causes the planet to shrink and lose mass at an alarming rate.
Researchers developed stable MXene-coated contact lenses providing enhanced protection against electromagnetic radiation. The lenses exhibited a rapid temperature rise when exposed to microwave heating, indicating strong EMR absorption and dissipation.
Researchers at Pohang University of Science & Technology (POSTECH) have developed an achromatic metagrating that handles all colors in a single glass layer, eliminating the need for multiple layers. This breakthrough enables vivid full-color images using a 500-µm-thick single-layer waveguide.
Researchers measured RF-EMF levels in various environments in Switzerland, finding exposure increases with population density. Exposure was highest when using the phone for maximum data download or upload, with average levels reaching up to 16 mW/m².
The study reveals that twisting the filament at micro and nanoscale produces light waves with elliptical polarization, offering a new avenue for robotic vision systems. Brightness is up to 100 times brighter than other approaches, but includes a broad spectrum of wavelengths and twists.
Researchers at Princeton Plasma Physics Laboratory have developed a technique to prevent unwanted waves that siphon off needed energy, increasing the efficiency of fusion reactions. Positioning a metal grate at a slight angle enhances heat put into the plasma and reduces slow modes, leading to more powerful and efficient fusion heating.
Researchers from the University of Tokyo have developed a novel approach to manage waste heat in microcircuits by adding a tiny coating of silicon dioxide. This increases the rate of heat dissipation, allowing for faster cooling and potentially leading to smaller and cheaper electronic devices.
Recent advancements in terahertz radiation reveal the physical processes involved in quantum materials. The study highlights the exploration of THz emission in topological insulators and semimetals, multiferroics, and superconductors, shedding light on their fundamental physics.
Scientists have developed a new way to alter the DNA of bacterial cells using high-frequency radio waves, outperforming traditional industry techniques. The process shows high efficiency and gentleness, with 91% of E. coli cells taking on the DNA after just three minutes.
Researchers at Gwangju Institute of Science and Technology developed metal-enhanced fluorescence probes for rapid and accurate detection of influenza viruses. The probes showed high sensitivity and specificity, detecting the virus even at low concentrations, with a remarkable accuracy of over 99%.
A new study by the University of Oldenburg team confirms that radio waves in the VHF range above 116MHz have no impact on migratory birds' magnetic compass sense. This discovery debunks previous theories suggesting mobile communication networks affect the birds' navigation.
An international team of scientists reported on a radio pulsar phase from a Galactic magnetar, revealing unique emission mechanisms for 'bursts' and 'pulses'. The study provides clues to the formation theory of fast radio bursts.
A better way to wirelessly charge over long distances has been developed, utilizing the phenomenon of radiation suppression. The research shows high transfer efficiency, over 80 percent, can be achieved at distances approximately five times the size of the antenna.
Researchers developed a new spectropolarimetric imaging technique called DIP-SP, which integrates a passive polarization modulator into an imaging spectrometer. This approach enables high-dimensional information capture from incomplete measurements and significantly improves image quality.
A Cornell astrophysicist explains how the Imaging X-ray Polarimetry Explorer (IXPE) satellite detected polarized X-rays from a magnetar, revealing 'photon metamorphosis' – a transformation of X-ray photons. The phenomenon is a natural consequence of quantum electrodynamics under strong magnetic field conditions.
Researchers have created a tiny pill-like electromagnetic device that can provide medical professionals with diagnostic information about the inner workings of the gastrointestinal tract. The device, when swallowed, delivers data to a smartphone as it passes through the body using electromagnetic technology similar to MRI machines.
A team of researchers has developed an experimental method to manipulate the Rydberg state excitation in hydrogen molecules using bicircular two-color laser pulses. By controlling the photon effect and field effect, they were able to generate Rydberg states while varying the extent to which each effect contributed to the process.
Scientists from Göttingen and Lausanne successfully created electron-photon pairs in an electron microscope for the first time. This breakthrough enables researchers to harness free electrons and photons in a controlled manner.
Scientists at Chung-Ang University have pioneered a novel method for controlling microdroplet motion on solid surfaces using near-infrared light. This approach allows for more precise control than traditional thermal techniques and opens up new possibilities for applications in microfluidics, drug delivery, and self-cleaning surfaces.
Researchers at Waseda University demonstrate a novel zirconocene-catalyzed epoxide ring-opening reaction under visible light, expanding the reaction scope and regioselectivity. The approach enables accessible synthesis of elusive alcohol products with improved efficiency and environmental sustainability.
Researchers used terahertz time-domain spectroscopy to compare fossil and synthetic ambers. The technique detected differences in the materials' compositions, indicating potential detection methods for synthetic forgeries.
A physicist at Lancaster University has suggested an alternative approach to calculate radiation reaction, which has sparked controversy. The proposed method considers the effects of many charged particles on each other's fields, rather than self-interaction, leading to new insights into energy and momentum conservation.
A meta-analysis of 4280 samples found cell phone use associated with reduced sperm motility, viability, and concentration. The study suggests male users should limit daily cell phone use to protect their fertility.
Astronomers observe a tidal disruption event caused by an intermediate-mass black hole consuming a star, providing the first measurements of its mass and spin. The findings shed light on the elusive category of intermediate black holes, which may account for most black holes in galaxy centers.
Scientists developed a machine learning method to analyze NMR data, allowing faster and more accurate analysis of proteins and chemical reactions in the human body. The method uses an artificial deep neural network to separate and analyze complex data, resulting in highly reproducible results comparable to human experts.
Researchers from NUST MISIS and international partners create a radar-absorbing polymer composite with excellent magnetic and microwave properties. The composite can absorb 99.9% of incoming electromagnetic radiation, making it suitable for EMI shielding applications in industries such as 5G networks and radar absorbing coatings.
Researchers at Osaka University developed a numerical method to visualize how signals propagate and radiate in electromagnetic circuits. The simulator considers both conduction and radiation phenomena, enabling the prediction of electromagnetic noise in circuit designing stages. This breakthrough aims to reduce power consumption and pr...
Scientists with the HAWC Collaboration have detected gamma-ray emissions at unprecedented energy levels above 56 TeV. The findings suggest the presence of Galactic accelerators, known as PeVatrons, which could be a new area of research for pulsars and supernova remnants.
Researchers from ITMO University and the University of Rochester successfully generated terahertz radiation in a liquid medium, demonstrating its efficiency comparable to solid-state sources. The team found that liquids have several advantages over gases, including higher electron density and lower pumping energy requirements.
Austrian physicist Friedrich Hasenöhrl's work on blackbody radiation in a cavity may have influenced Einstein's famous equation E=mc2. However, the study also reveals that Hasenöhrl arrived at an incorrect energy/mass correlation due to failing to account for mass loss during radiation.
Recent NIST airframe tests provide valuable insights into how high-energy interference affects aircraft. The findings will help ensure continued air travel safety and inform the FAA's certification process.