Articles tagged with Electromagnetic Waves
Researchers at Drexel University have developed a thin film device that can dynamically control electromagnetic wave shielding using MXene materials. The device can convert from shielding to quasi-electromagnetic wave transmission by electrochemical oxidation, making it suitable for various security applications.
Researchers at EPFL have developed a new thin-film circuit that produces finely tailorable terahertz-frequency waves, enabling precise control over frequency, wavelength, amplitude, and phase. This breakthrough has significant implications for future electronics, telecommunications, spectroscopy, and quantum applications.
Researchers observed energy transfer from resonant electrons to whistler-mode waves in space, confirming non-linear growth theory. This finding improves understanding of space weather's impact on satellites and could help protect astronauts.
Researchers at The University of Hong Kong and MIT have developed a new method to produce stronger interactions between photons and electrons, enabling hundredfold increases in light emission. This breakthrough has potential ramifications for commercial applications and fundamental scientific research.
Scientists have developed a new method to enhance electron-photon coupling, resulting in a hundredfold increase in light emissions. The approach uses a specially designed photonic crystal to produce stronger interactions between photons and electrons.
Researchers developed a one-dimensional suspended high-contrast grating structure to enable directional lasing with high energy efficiency. The device can adjust the emission angle over a wide range, from -40° to +40°, making it suitable for solid-state LiDAR applications.
Researchers at the University of Central Florida have created a technology that converts radio frequency signals into direct current electricity, reducing the need for batteries in wireless systems. This innovation can help promote a more sustainable future by harnessing ambient energy from radio waves.
Researchers created a magneto-impedance sensor magnetometer that measures Earth's geomagnetic field fluctuations, enabling real-time monitoring of space weather and advancement of space research. The device is lightweight, power-efficient, and low-cost, making it suitable for constructing multi-point observation networks.
Researchers have successfully detected terahertz waves with a fast response and high sensitivity at room temperature, using a graphene transistor. The breakthrough could have massive ramifications for spectroscopy, imaging, and future wireless technologies like 6G and 7G.
A new space-time coding antenna developed at City University of Hong Kong enables manipulation of beam direction, frequency, and amplitude for improved user flexibility in 6G wireless communications. The antenna relies on software control and combines research advances in leaky-wave antennas and space-time coding techniques.
Researchers at UNIST developed a subcutaneously implantable electromagnetic biosensor system for continuous glucose monitoring. The new technology eliminates the need for frequent finger pricking, providing more accurate blood glucose level tracking and improved patient care.
Researchers have discovered new waves with picometer-scale spatial variations of electromagnetic fields that can propagate in semiconductors like silicon. This finding enables the emergence of 'picophotonics,' which may lead to the design of new optical devices and applications in quantum technologies.
Researchers at Drexel University have developed a composite material that can absorb and dissipate electromagnetic waves, reducing electromagnetic interference. The MXene-polymer coating has shown to be highly effective in absorbing energy at greater than 90% efficiency.
Researchers from the Institute of Physical Chemistry, Polish Academy of Sciences developed a novel time-resolved NMR method to study complex chemical processes. The method combines time-resolved diffusion NMR and time-resolved nonuniform sampling, allowing for detailed studies with high resolution and real-time monitoring.
A new broadband near-field chiral source enables comparison of different edge states to advance applications in integrated photonics and wireless devices. The research advances the field of chiral photonics science, promoting applications of chiral-sorting technology for microwave metadevices.
Researchers at Nagoya University used satellite data to track ionospheric disturbances after the 2022 Tonga underwater eruption, detecting earlier signs of tsunami waves. The team found that electromagnetic waves traveled 1000 km/s, much faster than air pressure waves, allowing for potentially quicker tsunami warnings.
Researchers at the University of Utah designed composite materials using moiré patterns, resulting in abrupt transitions between electrical conductor and insulator properties. The study's findings have broad potential technological applications and demonstrate a new geometry-driven localization transition.
By pairing two waveguides, one with an ill-defined topology and another with a well-defined one, researchers created a topological singularity that can halt waves in their tracks. This phenomenon has potential applications in energy harvesting and enhancing nonlinear effects.
Researchers at Duke University have developed a machine learning algorithm that incorporates known physics into neural networks, allowing for new insights into material properties and more efficient predictions. The approach helps the algorithm attain transparency and accuracy, even with limited training data.
Researchers developed a light-controllable time-domain digital coding metasurface that can manipulate microwave reflection spectra by time-varying light signals. The metasurface platform produces harmonics based on phase modulation, generating symmetrical harmonics and white-noiselike spectra.
Researchers observed rapid electron precipitation from low-Earth orbit using the ELFIN mission, which was caused by whistler waves affecting electrons in the Earth's magnetosphere. The findings demonstrate that whistler waves are responsible for far more electron rain than current theories and space weather models predict.
Researchers developed a new waveguide to overcome limitations in THz signal transmission and processing. The device allows for unprecedented flexibility towards manipulating THz pulses, enabling complex signal-processing functionalities such as holographic messaging.
Researchers have discovered that altering the interface between two materials in time can lead to new opportunities for wave manipulation. This breakthrough enables novel concepts and applications in photonics, including nonreciprocal gain, power steering, and optical drag.
Researchers have achieved triple-wave cloaking for both sound and light using computational inverse design method. This breakthrough expands the functionality of biphysical cloaks, enabling a wider range of materials to be used, including those beyond traditional metals.
The detection of high-frequency gravitational waves would offer insights into the early Universe's phases, inaccessible to electromagnetic wave investigations. Currently, technological challenges limit the sensitivity of proposed projects to six orders of magnitude lower.
Researchers have designed a tiny and flat antenna for receiving and transmitting terahertz signals, enabling the miniaturization of THz devices. The new design integrates the antenna with the system, eliminating the need for bulky silicon lenses and reducing optical power required.
The study reveals that a single folding mechanism can generate an infinite family of shapes in flexible structures. Researchers have developed a novel approach to predict and control tough, flexible structures from skyscrapers to microscale using conformal deformations.
A mechanical RIS has been developed with high reconfiguration degree of freedom, low power consumption, and real-time dynamic control capabilities. It uses a robust control method to determine the rotation angle of each meta-atom and offers a new energy-saving and environmentally friendly alternative for wireless communications systems.
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.
Researchers from Nagoya University revealed a new energy transfer pathway between high-frequency plasma waves and low-energy ions, generating low-frequency plasma waves through collisionless plasma. This discovery could contribute to improved space weather forecasting and safer satellite operations.
Researchers at Lancaster University successfully transferred digitally encoded information wirelessly using nuclear radiation, achieving 100% successful transmission tests. This novel approach uses fast neutrons, which can penetrate materials like metals, making it ideal for safety-critical scenarios and emergency rescue operations.
Researchers track migration of fast ions, revealing routes influenced by Alfvén waves. The observed patterns suggest a large-scale migration among different routes, with some ions escaping the core and others returning to it.
Physicists from HSE University and MIPT discovered a correlation between Martian dust storms and Schumann resonances. The study suggests that electric fields in the Martian atmosphere may induce standing electromagnetic waves, similar to those on Earth.
Researchers create ultra-broadband sound absorber with an average absorption coefficient of 0.93, surpassing previous limitations. The metamaterial's design utilizes near-field non-locality to suppress excessive response and achieve efficient impedance matching.
Researchers developed a novel spintronic-metasurface terahertz emitter that generates broadband, circularly polarized, and coherent terahertz waves. The design offers flexible manipulation of the polarization state and helicity with magnetic fields, enabling efficient generation and control of chiral terahertz waves.
Researchers developed a high-precision THz time-domain ellipsometry system to characterize wide-gap semiconductors. The system can measure carrier densities up to 10^20 cm^-3 with superior accuracy and precision, resolving a long-standing challenge in the field.
A Russian-U.K. research team has proposed a theoretical description for the new effect of quantum wave mixing involving classical and nonclassical states of microwave radiation. The study builds on earlier experiments on artificial atoms, which serve as qubits for quantum computers and probes fundamental laws of nature.
Researchers found that electron precipitation from northern lights causes local ozone layer depletions in the mesosphere, potentially impacting climate. The study provides insight into this phenomenon, known as pulsating aurorae, and highlights its significance for global climate change.
Researchers at Cornell University propose a new way to modulate metamaterials' absorptive and refractive qualities in real-time, increasing their effectiveness. This breakthrough could lead to the development of new metamaterials with improved wave absorption and scattering properties.
Researchers developed a general framework for dynamic control of THz wavefronts using cascaded metasurfaces. By varying the polarization of a light beam with rotating multilayer metasurfaces, they demonstrated efficient redirection and manipulation of THz beams, overcoming limitations in local tuning.
The study presents a phononic crystal that enables robust topological states at three dimensions, allowing for diverse wave steering applications. The researchers demonstrated the ability to engineer negative refraction of sound waves and utilize topological hinge states as transport channels.
Researchers at Tokyo University of Agriculture and Technology developed ultra-short collimating metalens that can manipulate terahertz waves, enhancing directivity by three times. The technology has promising applications for short-range data exchanges and may support emerging 6G wireless communications.
Researchers from Tomsk Polytechnic University and Spanish universities have developed a simple method to boost the responsivity of terahertz radiation detectors by 3.5 times using a small Teflon cube. This enhancement enables more precise measurements without changing the detector's design.
Optical cloaking technology may soon be used in vehicles to remove blind spots and enhance safety. Recent research has made progress in developing invisibility cloaks using standard optical components.
Researchers at UNIST developed mechanically closable nanotrenches to switch optical functionalities in a repeatable manner. These findings enable nonlinear switching of metamaterial multifunctionalities with applications in various fields including 6G communication frequency control.
Researchers at NUS successfully demonstrated a system that wirelessly powers wearables by harnessing energy from the environment and transmitting it through the human body. The technology can power up to 10 wearable devices for over 10 hours, paving the way for battery-less wearables.
Researchers have identified Alfven waves as the primary cause of the most brilliant auroras. These waves accelerate electrons toward Earth, producing atmospheric light show, through a process known as Landau damping. The study, conducted at the Large Plasma Device, confirms decades-long quest to demonstrate experimentally the physical ...
A team of scientists from UCLA and other institutions has confirmed the interaction between electrons and Alfvén waves, shedding light on the origin of the aurora borealis. The experiment replicated conditions in Earth's auroral magnetosphere, revealing that electrons undergo resonant acceleration by the Alfvén wave's electric field.
A joint research project by Shinshu University and Genesis Research Institute found that electromagnetic anomalies occur before earthquakes due to gas-electric interactions. The anomalies are caused by the trapping of fluid in a fault-valve, which eventually cracks and releases charged gas, generating a large current.
A new robot-assisted broadband photo-monitoring platform has been developed using physically enriched carbon nanotube thin films to act as uncooled imager sheets. This device enables stereoscopic sensing of curved objects and detects minuscule defects, revolutionizing industrial inspection.
Researchers at DOE's Princeton Plasma Physics Laboratory receive $2 million in funding to investigate magnetic reconnection and plasma blobs that can disrupt communications satellites. They aim to recreate conditions in the magnetosphere using a device resembling an enormous silvery barrel tipped on its side.
Scientists quantify space-time nonseparability of electromagnetic pulses using quantum state tomography and calculate fidelity, concurrence, and entanglement. They propose novel concepts for measuring space-time entanglement in structured light, opening new avenues for ultrahigh-capacity communication and high-security encryption.
Researchers at POSTECH have designed a metasurface that can control acoustic and elastic waves, achieving underwater stealth capability untraceable by SONAR. The technology also enables drastic alteration of wave propagation through curved plates, such as vibrations.
Recent advancements in metasurfaces for manipulating terahertz waves enable ultra-compact devices with unusual functionalities for applications such as imaging, encryption, and communications. Metasurfaces can locally control wavefronts at subwavelength resolution, making them ideal candidates for THz device miniaturization.
Researchers successfully demonstrated a new methodology for direct near-field optical imaging of acoustic graphene plasmon fields. This strategy will provide a breakthrough for the practical applications of acoustic graphene plasmon platforms in next-generation optoelectronic devices.
Researchers developed a new optical sensor that mimics the mantis shrimp's eye, enabling simultaneous hyperspectral and polarimetric imaging. The SIMPOL sensor can detect spectral features 10 times narrower than typical sensors, opening doors to organic electronic sensing technologies.
Researchers found that radar overestimates precipitation rates when partially frozen droplets are larger than their solid and liquid counterparts. The phenomenon, known as reflectivity maxima above freezing (RMAF), is more common on windward slopes of mountain ranges.
Researchers at the University of Pittsburgh took snapshots of light using ultrafast microscopy, stopping it to observe its behavior. They discovered that light vortices can cause transitions in solid state materials, generating topologically distinct materials.
A Brazilian researcher conducted an experimental study of electron-plasma interactions, simulating plasma conditions in a vacuum using short electromagnetic waves. The study found that electrons transfer energy to the wave and then receive energy from it, with non-linear effects occurring at high electric current values.
Researchers at Drexel University have developed MXene-coated fabrics that block electromagnetic waves and radiation, exceeding the performance of commercial metal-coated fabrics. The materials can be sustainably produced by coating form aqueous solution without extra processing or chemical additives.