Articles tagged with Metasurfaces
Researchers at Pohang University of Science & Technology (POSTECH) created a multifunctional vortex beam capable of operating with a wide range of light frequencies using a metasurface. The breakthrough technology has the potential to store more information at the same frequency, paving the way for 6G communication systems.
Researchers at UBC Okanagan have developed transmission schemes that incorporate reconfigurable intelligent surfaces to serve as reflectors within existing wireless networks. These surfaces can bounce signals to cell phones, improving accuracy and reliability in location services and data speeds.
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.
Direct incorporation of a metasurface in a laser cavity enables spatiotemporally modulated laser pulses. Giant nonlinear saturable absorption allows pulsed laser generation via Q-switching process.
Scientists have engineered electrically tuneable arrays of nanoparticles called 'metasurfaces' that can offer significant benefits over current liquid crystal displays. The metasurface cells replace the liquid crystal layer, reducing energy consumption by 50% and offering a tenfold greater resolution.
Researchers at Purdue University have made a groundbreaking discovery in the field of thermal radiation, uncovering a new method for generating spinning thermal radiation in a controlled and efficient manner. The team's findings, published in Science Advances, demonstrate the ability to generate predominantly left-handed circularly pol...
Researchers have developed a novel terahertz beam steering system utilizing a liquid crystal elastomer (LCE) metasurface that can actively deflect the direction of the incident wave. The LCE metasurface demonstrates outstanding beam steering performance, with an output angle range of 70° to 25° for frequencies between 0.48 and 1.1 THz.
Researchers developed intelligent programmable meta-imagers that generate learned illumination patterns to pre-select relevant details during measurement, improving high-accuracy sensing with reduced measurements. The system adapts to different types and levels of noise, outperforming conventional compressed sensing.
A new parallel peripheral-photoinhibition lithography system has been developed, enabling the fabrication of subdiffraction-limit features with high efficiency. The system uses two beams to excite and inhibit polymerization, allowing for nonperiodic and complex patterns to be printed simultaneously.
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.
University of Minnesota researchers have developed a contactless manipulation method using ultrasound waves, which can move larger objects without physical contact. This technique uses metamaterial physics to steer objects in desired directions, enabling control through sound reflection.
Researchers establish a relation between angular diversity and spatial footprint using a transmission matrix framework for wide-FOV metalenses. A thickness bound is determined based on diffraction-limited focusing quality, allowing for compact systems with enhanced imaging capabilities.
A POSTECH research team developed single-cell-driven tri-channel encryption meta-displays, which project different images depending on where you look at them. These displays overcome the limitations of conventional metasurfaces by combining amplitude modulation and geometric phase manipulation.
A team of scientists developed a near-infrared spectropolarimeter based on an electrically-tunable liquid crystal metasurface. The system simultaneously measures polarization and spectral information using a tunable metasurface with high-quality-factor guided-mode resonances combined with a computational reconstruction algorithm.
A team of researchers from Pohang University of Science & Technology (POSTECH) has created a fixed LiDAR sensor that can see objects in all directions. The new sensor uses a metasurface to expand its viewing angle, allowing for 360° recognition and three-dimensional imaging.
A team at KAUST has created an ultrathin dielectric metalens that improves focusing capabilities and can be scaled down for integration with photonics equipment. The metalens, designed from a custom array of TiO2 nanopillars atop a DBR, offers negligible intrinsic loss and easy fabrication.
Researchers develop single metasurface to realize color-selective 3D polarization structures, offering unprecedented control over polarization with color information in 3D space. The discovery has potential applications in vector beam generation, virtual reality, and information security.
The researchers designed and fabricated three different paper-based metamaterials using their new technique, including a polarization converter, an absorber, and a conformal coding metasurface. These materials demonstrated unique properties such as high conductivity and radar cross-section reduction.
A team of engineers has created a miniature chip that uses 'rainbow' trapping of light to detect viruses and diseases. The system, which can be integrated with smartphones, allows for high-throughput sensing of biomarkers such as exosomal epidermal growth factor receptor (EGFR), distinguishing lung cancer patients from healthy controls.
Researchers at Columbia University have invented a flat lens that exclusively focuses light of a selected color, appearing transparent until illuminated with the correct wavelength. The device overcomes challenges in conventional AR glasses, enabling unattenuated and undistorted vision of both real-world scenes and contextual information.
Researchers developed a metasurface device with three working modes, exploiting nanostructures to manipulate light and create holographic or structural-color nanoprinting images. The device offers two layers of security for anticounterfeiting measures, providing a simple yet effective approach to fight against counterfeiting.
Engineers at Duke University developed a scalable soft surface that can continuously reshape itself to mimic objects in nature. It uses electromagnetic actuation, mechanical modeling, and machine learning to form new configurations and adapt to hindrances.
Researchers develop a novel method to generate FMCWs and control their spatial propagation behaviors simultaneously using a reflection-type STCM. The proposed method reduces system complexity and cost compared to traditional FMCW signal generation methods.
Scientists have developed a thin device that can produce complex webs of entangled photons, enabling new information processing schemes and advanced encryption methods. The device uses a metasurface to control the phenomenon of quantum entanglement, paving the way for more compact and powerful computing and sensing technologies.
Researchers at Washington University in St. Louis have invented a technique to generate Airy beams in water using 3D-printed binary acoustic metasurfaces, enabling broad applications in biomedical imaging and therapy.
Scientists demonstrate efficient and controllable emission of circularly polarized light from resonant metasurfaces. The high-purity light source has a directional output and is independent of excitation power.
A newly developed polarizer-embedded metalens microscope system achieves high-quality, wide-field imaging with a large depth-of-field, significantly expanding human eyesight to the microworld. The chip-scale device offers a thousand-fold reduction in volume and weight compared to traditional microscopes.
Researchers at Rice University have created 2D chiral superstructures using three-sided pyramids, which could lead to breakthroughs in metamaterials. The structures, composed of ultrathin assemblies of particles, incorporate left-handed and right-handed domains and exhibit unique optical properties.
Researchers at Duke University have developed a new design for plasmonic metasurfaces that greatly expands their frequency range while also making them more robust against the elements. The new fabrication process allows for the use of a wide variety of shapes, opening up new possibilities for applications such as super cameras.
Researchers at Osaka University have created a microfluidic system that can detect minute changes in the concentration of trace amounts of ethanol, glucose, or minerals in water using terahertz radiation. The device achieved sensitivity levels an order of magnitude better than existing microfluidic chips.
Researchers developed a color filter with metasurfaces that can display vivid images on a filter as thin as three strands of hair. The filter offers 120-170 times higher resolution than high-end smartphone screens and can control individual pixel colors for various applications.
Researchers have made a breakthrough in controlling metamaterials with brainwaves, enabling real-time, remote, and wireless applications. The team developed a framework for remotely mind-controlled metasurfaces using Bluetooth technology.
Researchers create an electromagnetic brain-computer-metasurface (EBCM) that can decode operator's intentions and send commands wirelessly. The system uses EEG signals to translate brain messages into various EM commands, enabling text communication between operators.
A novel all-optical switching method has been developed to make optical computing and communication systems more power-efficient. The method utilizes the quantum optical phenomenon of Enhancement of Index of Refraction (EIR) to achieve ultrafast switching times, ultralow threshold control power, and high switching efficiency.
Researchers developed a metasurface-based device that produces multiple distinct holographic images depending on the surrounding medium and wavelength of light used. The device can be used for encryption, humidity sensing, or biomedical applications.
A new approach using artificial intelligence generates designs automatically, allowing researchers to create complex metasurfaces with billions of nanopillars. This enables the development of larger, more complex metalenses for virtual reality and augmented reality systems.
Researchers at Georgia Tech have developed the first-ever electrically tunable photonic metasurface platform, which enables reconfigurable metasurfaces with high levels of optical modulation. This breakthrough has significant implications for various technologies such as LiDAR systems, imaging, spectroscopy and sensing.
Researchers have created a light-to-microwave transmitter using an optically programmed time-varying metasurface, enabling direct conversion of light signals to microwave signals. The system can transmit two different videos simultaneously over a single platform, paving the way for low-cost and low-complexity hybrid communication systems.
Intelligent metasurfaces have three crucial properties: digitalization, programmability, and intelligence. They enable control without human intervention, unlocking devices like cloaking, tunneling, and holograms.
Researchers have developed graphene-empowered dynamic metasurfaces and metadevices that can actively tune their electromagnetic wave manipulation capabilities. The devices exploit the unique properties of graphene to manipulate visible, terahertz, and microwave frequencies.
Researchers at Rice University have created a 'metalens' that transforms long-wave UV-A into a focused output of vacuum UV radiation. The technology uses nanophotonics to impart a phase shift on incoming light, redirecting it and generating VUV without the need for specialized equipment.
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.
Scientists at IIT realized coupled light vortices forming an ordered structure, a light crystal. They developed metasurfaces to control laser beams and created 100 light vortices with tunable topology, enabling new properties for optical communications and simulations of complex systems.
A research team at Pohang University of Science & Technology developed an optical encryption platform that works in both the visible and ultraviolet regimes. The platform uses metasurface technology to display unique product numbers and improve encryption security.
Scientists have developed a metasurface lens with tunable focus using a piezoelectric thin film, enabling compact and lightweight optics. The new technology could be used in various applications such as portable medical diagnostic instruments, drone-based 3D mapping, and miniaturized cameras.
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.
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.
Researchers have proposed a new method for controlling the polarization of cylindrical vector beams (CVBs) using a metal-dielectric-metal metasurface. This enables independent modulation of the left- and right-handed circularly polarized components, allowing for efficient multiplexing and demultiplexing of CVBs.
A Korean research team has developed a metasurface-based optical device that can store over 100 times more information than conventional rainbow hologram stickers. The device selectively displays images according to angle, color, and polarization, making it highly secure against counterfeiting.
Researchers discuss recent progress in optical dynamic meta-holography, a technology for 3D display scenes. Metasurfaces enable more powerful light modulation capabilities, offering advantages such as higher spatial resolution and elimination of diffraction orders.
The new system can produce high-quality images comparable to those of conventional cameras, with a compact design suitable for minimally invasive endoscopy and full-scene sensing. This breakthrough could revolutionize medical imaging and robotics with size and weight constraints.
Researchers at Harvard SEAS developed a new silicon coating that counters chromatic dispersion in transparent materials like glass. The ultra-thin coating uses precisely designed silicon pillars to capture and re-emitting red light, allowing slower-moving blue light to catch up.
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 at Harvard John A. Paulson School of Engineering and Applied Sciences have developed a simple spatial light modulator made from gold electrodes covered by a thin film of electro-optical material. This device can control light intensity and pixel by pixel, enabling compact, high-speed, and precise optical devices.
Researchers at Harvard John A. Paulson School of Engineering and Applied Sciences developed a metasurface using ultra-deep holes to focus light to a single spot, achieving a record-breaking aspect ratio of nearly 30:1. This breakthrough enables the creation of large achromatic metalenses with diverse color control capabilities.
Electrical engineers at Duke University have discovered a way to extend the use of chalcogenide glasses into the visible and ultraviolet parts of the electromagnetic spectrum. By nanostructuring these materials, they can create high-order harmonic frequencies that enable transmission of light at previously inaccessible wavelengths.
Researchers discuss the recent development of quantum optics based on micro/nano structures, including metasurfaces, which offers rich light field control function to discover new quantum physics. Metasurfaces has great potential in quantum optics, enabling the exploration of quantum technologies with strong stability and high efficiency.
Researchers at University of Toronto have developed a new metamaterial that can channel light to enable more wireless data transmission over a single frequency, potentially doubling the capacity of existing networks. The 'full-duplex' intelligent metasurface has the potential to revolutionize wireless communication.
Researchers at Chalmers University of Technology have created microscopic metavehicles that can be controlled and maneuvered using light. By layering an optical metasurface onto a particle and using a light source to control it, the vehicles can move in complex patterns and even transport other objects.
Researchers propose a new coding strategy to achieve accurate and ultra-broadband control of harmonic waves based on time-domain digital coding metasurface. A 256QAM mmWave wireless communication system was successfully established, offering system simplicity, cost reduction, and energy efficiency.