Articles tagged with Electromagnetic Waves
Researchers developed a continuum model to describe the terahertz dielectric response of glasses, revealing the role of transverse shear dynamics in absorption. The model accurately reproduced experimentally measured data, providing a new framework for designing glass materials with low permittivity and low dielectric loss.
Researchers developed a heat-venting ceramic metastructure with high terahertz shielding efficiency, combining material modification and structural design. The metastructure exhibited multifunctional characteristics, including hydrophobic and antifouling surfaces and excellent heat dissipation capabilities.
Duke University has received a $24 million award to develop foundational science for engineering systems to counter unmanned aerial attacks. The center, led by Miroslav Pajic, brings together experts in wireless systems, cybersecurity, and AI to develop tools and automated procedures for detecting, thwarting, and controlling enemy drones.
Researchers developed a deep-learning compiler to map user-designed illusion patterns to programmable metasurfaces, enabling rewritable and customizable electromagnetic illusions. The metasurface can create complex two-dimensional illusions that adapt to changing conditions.
Researchers at University of Witwatersrand have discovered that quantum information can be kept intact even when transmitted through turbulent environments. This breakthrough enables the use of twisted light to create high-capacity communication networks and ultra-resilient quantum computers.
Researchers at Chalmers University of Technology have developed a new method for measuring breathing movements in patients with impaired lung function using radio frequency technology. The technique involves placing small tags on the chest wall, which can detect even slight differences in breathing movements and provide a detailed pict...
Researchers developed a self-stealth metasurface that achieves in-band and out-of-band radar cross-section (RCS) reduction across multiple frequencies. The metasurface enables real-time digital control for beamforming, information modulation, and smart surfaces, resolving performance/power/integration trade-offs.
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 create nanoscale slots to tune phonon vibrations, enabling ultrastrong coupling and hybrid quantum states in lead halide perovskite. This breakthrough could improve energy flow and performance in optoelectronics.
Researchers mapped electron density in the ionosphere and observed unique 3D wave patterns after the 2024 Noto Peninsula Earthquake, showing earthquakes generate waves from multiple points along the entire fault line. The study provides new insights into how earthquakes affect the upper atmosphere.
Researchers from The University of Osaka observed a rare phenomenon where lightning discharges accelerated electrons to near light speed, producing a gamma-ray flash. This study contributes critical data to understanding the mechanism behind these intense radiation bursts and their potential role in shaping Earth's atmosphere.
Scientists at Linköping University have made a significant breakthrough in creating controllable flat optics using nanostructures on a flat surface. By precisely controlling the distance between antennas, they achieved up to tenfold improvement in performance, opening up new avenues for applications such as video holograms and biomedic...
A team of researchers from Jinan University has developed a metasurface-based imaging technique that can precisely measure the intensity, phase, and polarization of arbitrary light field distributions in a single exposure. The system uses optimized metasurface structural parameters to diffract incident light fields into sub-images that...
Researchers have designed an optical device that functions as an optical black hole or white hole, behaving like a cosmic object that either swallows or repels light. This device relies on coherent perfect absorption of light waves and offers new possibilities for manipulating light-matter interactions.
Covert communication, a technique to hide communication behavior, offers an extra layer of protection. Researchers explored various domains and identified future research trends, including intelligent cooperative and parasitic methods.
Researchers have proposed a transformative, battery-less wireless sensing system to overcome IoT network deployment and power supply challenges. The bio-inspired system combines exceptional reliability with flexibility, addressing key limitations of traditional rigid wireless systems.
The University of Arkansas researcher Samir El-Ghazaly is designing a massive anechoic chamber to test antennas and certify RF interference produced by large electrical devices. The chamber, valued at nearly $1M, will be a testing site for Xtremis and potentially entice other startups to the area.
Researchers derived 2D coupled wave equations for photonic crystal surfaces, aiding the development of efficient laser devices. The findings established parallels between TM and transverse electric polarisation behaviours, offering unique advantages in certain configurations.
A team of researchers from the University of Tokyo has developed an ultrathin film that can absorb terahertz waves in the 0.1–1 THz range, enabling secure and clear transmission for 6G wireless communications. The absorber is made of titanium and oxygen and can be used outdoors due to its resistance to heat, water, light, and organic s...
A team of researchers from the University of Ottawa has developed innovative methods to enhance frequency conversion of terahertz (THz) waves in graphene-based structures, unlocking new potential for faster, more efficient technologies in wireless communication and signal processing. These advancements hold great promise for wireless c...
Researchers used time-delayed laser pulses to capture electric and magnetic field vectors of surface plasmon polaritons, revealing a meron pair's spin texture. The study demonstrates stable spin structures despite fast field rotations.
Researchers at Newcastle University developed a novel approach using electromagnetic waves to solve partial differential equations, specifically the Helmholtz wave equation. The innovative structure, known as a metatronic network, effectively behaves like a grid of T-circuits and allows for control over PDE parameters.
Researchers create flexible, lightweight, and durable antennas using kirigami and MXene nanomaterials. The antennas can be adjusted to change transmission frequency by simply pulling or squeezing the shape, making them ideal for soft robotics and aerospace applications.
Researchers at Macquarie University developed a new software package, TMATSOLVER, that accurately models complex wave scattering for metamaterial design. The tool enables rapid prototyping and validation of new metamaterial designs, accelerating research and development in this growing global market.
Researchers at the University of Southampton have successfully tested and proven a 50-year-old theory for the first time using electromagnetic waves. They demonstrated that twisted waves can be amplified by bouncing them off an aluminium cylinder rotating in a specific way.
The research team has successfully demonstrated the control of thermal radiation by metasurfaces, achieving circularly polarized light with full control over emission direction. This breakthrough enables the creation of custom light sources with desired spectral, polarization, and spatial features for various applications.
Researchers from the University of Electronic Science and Technology of China and Nanyang Technological University in Singapore have successfully created an electromagnetic vortex cannon using coaxial horn antennas. The device produces air vortices with remarkable resilience and self-healing properties, showcasing complex topological f...
Researchers at Florida State University have identified a new phenomenon in Kagome metal CsV3Sb5, which can create hyperbolic bulk plasmons with reduced energy loss. This breakthrough has the potential to advance technologies in nano-optics and nano-photonics.
A team of NUS researchers developed a compact and sensitive rectifier technology that uses nanoscale spin-rectifiers to convert ambient wireless radio frequency signals into DC voltage. The technology overcomes challenges in existing energy harvesting modules, enabling battery-free operation for small electronic devices.
Researchers propose that simple forms of ultra-light scalar field matter could generate detectable gravitational wave backgrounds soon after the Big Bang. This discovery could shed light on dark matter and its role in the universe's mass, offering a new avenue for fundamental physics research.
Researchers developed a method to analytically express the performance of wireless communication systems when using reconfigurable intelligent surfaces (RIS). The model accurately predicted the effects of RIS on improving radio wave propagation environment, providing a useful guide for positioning RIS to receive stronger signals.
Physicists at the University of Cologne have discovered that magnetic elementary excitations in BaCo2V2O8 crystals are bound by both attractive and repulsive interactions. The study found that repulsively bound states, which were unexpected due to their lower stability, can exist in these materials.
Researchers from Shinshu University have developed a strategy to up- and down-convert terahertz signals using dynamic conductivity modification, creating temporal boundaries. This approach could pave the way for faster data transmission and enhanced telecommunications in fields like deep learning and robotics.
KSU assistant professor of mathematics Eric Stachura will investigate how electromagnetic waves interact with surfaces, a problem relevant to defense mechanisms against directed energy weapons. The three-year grant enables collaboration with researchers in Sweden and Greece, as well as student projects at Kennesaw State.
Dr. Ifana Mahbub and her team are developing far-field wireless power transfer technology to enable drones to recharge without landing. The technology uses phased-array antennas to steer electromagnetic waves along a targeted path, minimizing signal loss.
Research team finds chorus waves suppress ECH waves, leading to dominant role in diffuse auroral precipitation. Chorus waves' effect confirmed through simulations and Japan's Arase satellite data.
Brown University researchers unveil novel method to manipulate terahertz waves, allowing them to curve around obstacles instead of being blocked. The technique uses self-accelerating beams to maintain signal integrity in crowded environments.
Researchers propose a thermal-electromagnetic null medium to control temperature fields and electromagnetic waves simultaneously, enabling the design of on-chip devices with improved electromagnetic compatibility and heat dissipation. The proposed surface transformation method allows for the creation of thermal-electromagnetic cloaks t...
Researchers at TU Wien have demonstrated the possibility of encoding valuable data, such as Bitcoin wallet addresses, in ordinary plastic using 3D printing and terahertz radiation. By adjusting the thickness of the plastic plate to alter the terahertz wave, a holographic image is created that stores the desired code.
Researchers at Tohoku University have created a tuneable terahertz wave filter that can achieve higher transmission rates and better signal quality than conventional systems. The new filter uses Fabry-Perot interferometry to control the filtering effect, enabling selective transmission of desired frequencies.
A team at Zhejiang University has developed a self-driving cloaked unmanned drone with an intelligent aeroamphibious invisibility cloak, capable of manipulating electromagnetic scattering in real-time across dynamic environments. The cloak integrates perception, decision-making, and execution functionalities using spatiotemporal modula...
Researchers developed a carbon-based tunable metasurface absorber with an ultrawide, tunable bandwidth in the THz range. The absorber boasts high absorption efficiency and insensitivity to polarization angles, paving the way for advanced technological applications.
Scientists at Tohoku University successfully developed a room-temperature terahertz-wave detector using 2D plasmons, overcoming key bottlenecks in conventional detectors. The breakthrough enhances detection sensitivity by over an order of magnitude, enabling faster and more sensitive THz wave detection.
Researchers at Linköping University have developed an aerogel material that can tune the transmission of terahertz signals between 13% and 91%, enabling various applications. The material's absorption property can be adjusted through a redox reaction, making it suitable for long-range signals from space or radar systems.
Researchers have developed an integrated THz vortex beam emitter to detect rotating targets with remarkable precision. The system uses spiraling electromagnetic waves with orbital angular momentum to accurately measure the speed of a rotating object, with a maximum margin of error of just around 2 percent.
Researchers developed an accelerating wave equation to solve daily phenomena, revealing a well-defined direction of time. The framework also predicts energy conservation in certain situations, including exotic materials.
Scientists successfully demonstrated the deflection of terahertz waves using distorted photonic crystals, mimicking gravitational effects. This breakthrough has significant implications for 6G communications and graviton physics.
Researchers developed a proof-of-concept sensor that detects vibrations and changes in target position with high accuracy, using an innovative design to cancel out noise. The sensor's compact size, low cost, and long battery life make it suitable for various applications, including plant water status tracking and structural integrity d...
Scientists have developed a nonrelativistic and nonmagnetic mechanism for generating terahertz waves, harnessing the electrical anisotropy of two conductive oxides. This approach produces signals comparable to commercial terahertz sources and offers a high terahertz conversion efficiency.
Scientists at CUNY ASRC have shown that photons can collide and interact, allowing for new technologies to be developed. This breakthrough enables the manipulation of wave propagation, benefiting wireless communications, imaging, computing, and energy harvesting technologies.
Researchers developed a new approach to create a wideband microwave absorption metamaterial using ultraviolet lasers, achieving high absorption performance and control over electrical and magnetic properties. The process enables mass production of complex structures without post-treatment.
A study by the Helmholtz-Zentrum Dresden-Rossendorf team demonstrates efficient conversion of high-frequency signals into visible light using graphene-based materials. The mechanism involves a thermal radiation process, and the conversion is ultrafast and tunable.
Researchers verified the 'Trap-Release-Amplify' (TaRA) model by reproducing Martian whistler-mode chorus waves using data from the MAVEN mission. The study found that both Mars and Earth exhibit similar frequency sweeping phenomena triggered by nonlinear processes and background magnetic field inhomogeneity.
Researchers have developed a new method for designing metasurfaces using photonic Dirac waveguides, enabling the creation of binary spin-like structures of light. This advances the field of meta-optics and opens opportunities for integrated quantum photonics and data storage systems.
Researchers from HKUST and CityU developed a metasurface to generate time-varying OAM beams with a time-dependent phase profile. This allows for a higher-order twist in the envelope wavefront structure, increasing capacity for applications such as dynamic particle trapping and information encryption.
A new type of photonic time crystal has been developed, showing that these artificial materials can amplify electromagnetic waves. This could lead to more efficient wireless communications and improved lasers., The creation of two-dimensional photonic time crystals makes them easier to fabricate and experiment with.
Researchers at CUNY ASRC detail a breakthrough experiment in which they observed time reflections of electromagnetic signals in a tailored metamaterial. The effect causes a significant portion of the broadband signals to be instantaneously time reversed and frequency converted, forming a strange echo.
A team of researchers from Nagoya Institute of Technology introduced a new system using metasurfaces to create waveform-based selectivity in antennas. They demonstrated that their antenna design could selectively receive and transmit signals with different waveforms at the same frequency.
A South Korean research team has successfully searched for Dine-Fischler-Srednicki-Zhitnitskii (DFSZ) axion dark matter using a new experimental setup. The group achieved a higher sensitivity than existing experiments, excluding axion dark matter around 4.55 µeV at DFSZ sensitivity.