All articles tagged with #metamaterials
Physicists at CUNY ASRC demonstrate a lab analog of PenroseāZel'dovich energy extraction by using a ring of time-varying resonators to simulate ultrafast rotation, causing electromagnetic waves to extract energy and amplify without any physical spinning parts. The work, published in Nature, creates a versatile platform for studying extreme rotational physics with potential applications in communications and photonics.
Researchers at the CUNY Advanced Science Research Center built a radioāfrequency device whose rapidly timed parameter changes create a traveling, synthetic rotation, allowing waves to extract energy and become amplified in a way that mirrors the PenroseāZelādovich process. The experiment uses a ring of tunable resonators and engineered metamaterials to simulate extreme rotational dynamics without any physical spinning, providing a controllable platform for exploring highāenergy physics, optics, and quantum technologiesāand suggesting future tech applications.
Researchers at the Max DelbrĆ¼ck Center and Rostock University Medical Center unveiled a metamaterial-based MRI antenna that strengthens signals from deep tissues, enabling higher-resolution images of the eye and occipital brain regions and potentially shorter scan times without new equipment. Tested at 7.0 Tesla on volunteers, the compact antenna can be adapted to different body parts, may help reduce heating near implants, and could enhance MRI-guided therapies; larger clinical studies are planned and the approach targets broader organ imaging in the future.
Researchers demonstrate a printable meta-assembly strategy that embeds low-cost polystyrene nanoparticles in a PDMS matrix to form a nanolattice-based microconic optical interface. This design enables precise coupling of guided and reflected waves to produce tunable color patterns across seven orders of length scale, achievable with metre-scale, single-pixel customization via continuous roll-to-roll manufacturing. By adjusting nanoparticle size and the printed feature diameter, designers can tailor color separation and integration, yielding vibrant, stable colors suitable for eco-friendly coloration, intelligent displays, and information security. The work showcases scalable, designable metamaterials and proves robustness under UV, heat, solvents, washing, and mechanical deformation.
Researchers at City University of New York demonstrated temporal reflection by abruptly shifting a metamaterial's impedance, creating a time-reversed copy of an electromagnetic signal inside a fixed systemā the first experimentally observed time mirror. Published in Nature Physics, the result confirms a long-theorized effect in time-varying photonic media and hints at future applications in encryption and adaptive antennas, though practical scaling and energy constraints remain hurdles; time itself remains unaffected outside the device.
Physicists have experimentally confirmed the long-standing theoretical prediction of 'time mirrors' by reversing electromagnetic waves in time through engineered temporal boundaries in metamaterials, opening new avenues for wave control and potential applications in spectrum engineering and quantum technologies.
Scientists at CUNY successfully reversed electromagnetic waves in time using engineered metamaterials, demonstrating a phenomenon previously thought impossible, which could lead to advancements in wave-based technologies.
Researchers at the University of Leicester have developed a new, practical method for creating magnetic cloaks around objects of complex shapes using existing materials, moving the concept of invisibility closer to real-world applications in technology and industry.
Scientists in New York City have successfully observed time reflections, a phenomenon where electromagnetic waves are reversed in time, using engineered metamaterials and electronic switches, opening new possibilities for wireless communication and wave-based computing.
Researchers are exploring five advanced materialsāmetamaterials, graphene, MXene, carbon nanotubes, and ceramicsāthat could significantly enhance aircraft stealth capabilities by absorbing or deflecting radar signals, potentially making fighter jets nearly invisible to radar in the future.
Researchers have developed layered multicolor metalenses using stacked metamaterials that can focus multiple wavelengths simultaneously, overcoming the limitations of single-layer lenses. This innovative design is easy to manufacture, polarization insensitive, and scalable, with potential applications in compact, high-performance optical devices for drones, smartphones, and other portable technologies.
MIT researchers have developed a shape-changing, reconfigurable antenna using metamaterials that can adjust its frequency range by stretching, bending, or compressing, enabling versatile applications in communication and sensing without complex moving parts.
Scientists in New York City have experimentally confirmed the existence of time reflectionsāan elusive phenomenon where electromagnetic waves are reversed in timeāusing engineered metamaterials that can rapidly change their properties, opening new possibilities for wireless communication and wave-based computing.
Physicists have experimentally confirmed the existence of 'time mirrors,' devices that can reverse wave signals in time using engineered metamaterials, marking a significant breakthrough in wave manipulation and opening new possibilities for communication, imaging, and understanding time in physics.
Researchers from the University of Amsterdam have demonstrated the unique behavior of topological solitons in a robotic metamaterial, showing that they can be harnessed through non-reciprocal interactions to control the movement of robots, sense their surroundings, and communicate. The solitons, which behave like particles but retain their shape and cannot disappear, are being studied for their potential applications in materials science, robotics, and engineering, offering new possibilities for self-propelled motion and advanced functionality.