Articles tagged with Nonlinear Optics
Engineers at Harvard create microcombs on photonic chips, enabling compact, programmable frequency combs for precision measurement and telecommunications applications. The breakthrough makes electro-optic microcombs more practical, energy efficient, and diverse.
The Harvard researchers' new device is elegantly designed to be tunable, with a bilayer design that becomes geometrically chiral and able to 'read' chiral light. By using the MEMS device to continuously vary the twist angle and interlayer spacing, the team showed they could tune the device's intrinsic ability to read different chiral l...
A team of researchers from SASTRA Deemed University demonstrates a fiber-based method for compressing mid-infrared laser pulses into ultrashort, low-noise bursts efficiently. The system reduces input power from kilowatts to 80 watts, improving energy efficiency and thermal stability.
Researchers at Harvard John A. Paulson School of Engineering and Applied Sciences have discovered a new way to generate ultra-precise, evenly spaced laser light combs on a photonic chip. This breakthrough could miniaturize optical platforms like spectroscopic sensors or communication systems.
Researchers overcome spatial resolution limit of sum-frequency generation (SFG) spectroscopy by utilizing plasmonic near-field confinement. This breakthrough enables direct visualization of nanoscale orientation heterogeneity in interfacial molecular domains.
Scientists at SwissFEL have developed a technique known as X-ray four-wave mixing, allowing them to access coherences in matter for the first time. This breakthrough has the potential to illuminate how quantum information is stored and lost, ultimately aiding the design of more error-tolerant quantum devices.
Researchers at Lund University have developed a compact and elegant way to stretch ultrafast laser pulses using a diffraction grating, allowing for precise control over pulse duration. This enables full characterization in a single shot, without the need for pre-compensation optical elements.
Researchers at Paderborn University and TU Dortmund University have developed materials smaller than the wavelength of light and precisely manipulated photons. They created quantum light sources for quantum computing and ultra-fast communication, as well as low-temperature electronics to control quantum experiments.
Researchers at the Max Born Institute developed a laboratory-scale soft-X-ray instrument to study ultrafast processes of emergent textures in magnetic materials. They observed nanoscale magnetic maze domains and discovered complex reorganization patterns on picosecond to nanosecond timescales.
UCLA researchers create optical processor that performs massive parallel computation of nonlinear functions, executed rapidly and simultaneously at extreme spatial density. The study demonstrates the use of diffractive optical processors to approximate arbitrary sets of bandlimited nonlinear functions.
Scientists have successfully measured ultrafast electric fields using a diamond nonlinear probe, achieving femtosecond temporal and nanometer spatial resolution. This breakthrough enables the detection of local electric field dynamics near surfaces with unprecedented precision.
Using extreme ultraviolet high-harmonic interferometry, researchers tracked changes in the electronic bandgap of silica glass and magnesium oxide under strong laser excitation. The study found a shrinking bandgap in silica and a widening bandgap in magnesium oxide.
Researchers discovered that ultrafast magnetization switching proceeds with a speed of about 2000 meters per second, not uniformly throughout the material. A moving boundary propagates through the film, sweeping through the entire layer in roughly 4.5 ps.
Researchers create subwavelength dimer-on-film nanocavities to excite magnetic dipole resonance, enabling Lorentz-force-driven second-harmonic generation with high efficiency. The approach breaks conventional design paradigms and offers a new framework for studying magnetic field-related nonlinear optical processes.
A strong-confinement low-index rib-loaded waveguide structure enables efficient light propagation and high electro-optic coupling in TE polarization, opening up new ways for fast proof-of-concept demonstration. The structure achieved a 3-dB bandwidth beyond 110 GHz and a voltage-length product of 2.26 V·cm.
Researchers developed reconfigurable nonlinear Pancharatnam-Berry optics using patterned ferroelectric nematics, enabling dynamic control over nonlinear phase shifts. The approach offers unprecedented flexibility for advanced optical processing, adaptive optics, and quantum information technologies.
Researchers have developed a patterned layer of material that can dynamically tune advanced optical processes at visible wavelengths. The breakthrough enables adaptive camouflage, biosensing, and quantum light engines, leveraging the unique properties of van der Waals materials.
Researchers study impact of interactions on population distribution in topological trimer array, observing formation of nonlinear edge states. They extend domain of nonlinear topological photonics to ultracold atomic systems.
Researchers have developed a method to generate femtosecond polygonal optical vortices with square, pentagonal, and hexagonal intensity distributions. The technique utilizes a passive mode-locked solid-state Yb:KGW oscillator at quasi-frequency-degenerate state, delivering high-power FPOVs with excellent power stability.
The new Harvard device can turn purely digital electronic inputs into analog optical signals at high speeds, addressing the bottleneck of computing and data interconnects. It has the potential to enable advances in microwave photonics and emerging optical computing approaches.
Scientists generate collective molecular vibrations in a liquid by placing an electron ultrafast. These vibrations govern the electric behavior of the liquid and can be tuned to adapt its properties. The study reveals new insights into polar liquids' dynamics.
Researchers developed an open-source software tool, Phoenix, to simulate light behavior in quantum systems, solving wave equations in record time without high-performance computing expertise. The program is up to a thousand times faster and 99.8% more energy-efficient than conventional tools.
Researchers have developed a new RGB multiplexer based on thin-film lithium niobate (TFLN) that enables faster and more energy-efficient light modulation for laser beam scanning systems. The multiplexer successfully combined red, green, and blue laser beams, generating mixed colors such as cyan, magenta, and yellow, and even white light.
A team of researchers developed a reliable method to create donut-like, topologically rich spin textures called skyrmion bags in thin ferromagnetic films. The success rate of generating such textures using single laser pulses is significantly higher than magnetic-field-driven approaches.
Researchers create metasurfaces to control photons and entangle them for quantum computing and sensing. The discovery could lead to miniaturized optical setups with improved stability, robustness, and cost-effectiveness.
A research team from Tampere University and Université Marie et Louis Pasteur has demonstrated a novel way to process information using light and optical fibers. The study used femtosecond laser pulses and an optical fiber to mimic the processing of artificial intelligence, achieving accuracy of over 91% in under one picosecond.
Researchers at ETH Zurich have developed a new method for fabricating ultra-thin metalenses using lithium niobate nanostructures. These devices can convert infrared light to visible radiation, enabling new applications in security, microscopy, and electronics.
Researchers propose a new method for manipulating light using the geometry of matter, generating second-harmonic signals at much lower intensities than traditional methods. The team's design guidelines offer practical solutions for building nanoscale terahertz devices without applied voltage.
Researchers have identified nonlinearity in optoacoustic signals and a new contrast mechanism that significantly improves tissue characterization. The method uses thermally excited nonlinear susceptibility to offer novel imaging capabilities.
Physicists at Harvard SEAS have created a compact, on-chip mid-infrared pulse generator that can emit short bursts of light without external components. This device has the potential to speed up gas sensor development and create new medical imaging tools.
Harvard physicists develop an optical vortex beam that twists and changes shape, resembling spiral shapes found in nature. The 'optical rotatum' has potential applications in controlling small particles and micro-manipulation, and its creation is made possible with a single liquid crystal display.
A new study introduces a method to actively shape and control spatial coherence in nonlinear optics, allowing for the transfer of coherence patterns between different spectral ranges. This approach enables innovative applications in imaging, security, and biomedical diagnostics.
A new bilayer metasurface, made of two stacked layers of titanium dioxide nanostructures, has been created by Harvard researchers. This device can precisely control the behavior of light, including polarization, and opens up a new avenue for metasurfaces.
A new study introduces a method to synthesize spatial coherence during nonlinear interactions, allowing for the transfer of coherence patterns between different spectral ranges. This approach enables advanced imaging techniques such as infrared imaging for medical diagnostics and environmental monitoring.
Researchers have developed novel strategies to enhance THz nonlinearities in graphene-based structures, increasing third harmonic generation up to 30 times. A multilayered design and metasurface substrates were used to amplify the THz field, leading to a two-order magnitude increase in efficiency.
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...
Scientists have created extremely thin sheets of nitrogen-vacancy (NV) centers in diamond crystals, which exhibit exceptional sensitivity to environmental variations. The findings reveal the emergence of Fröhlich polarons, previously thought not to exist in diamonds, opening up new prospects for quantum sensing.
A new structure of light has been discovered that can accurately measure chirality in molecules, a property of asymmetry important in physics, chemistry, biology, and medicine. This 'chiral vortex' provides an accurate and robust form of measurement, allowing for the detection of chiral biomarkers.
Scientists have created perovskite crystals with predefined shapes to serve as waveguides, couplers, and modulators in integrated photonic circuits. The edge lasing effect is associated with exciton-polariton condensates, which exhibit nonlinear effects, enabling applications in quantum computing.
EPFL researchers have created an energy-efficient method for nonlinear computations using scattered light from low-power lasers. The new approach is scalable and up to 1,000 times more power-efficient than state-of-the-art digital networks, making it suitable for realizing optical neural networks.
Researchers have discovered that photo-excited YBa2Cu3O6.48 expels a static magnetic field from its interior, comparable to equilibrium superconductivity. This finding suggests that tailored light pulses can be used to synchronize fluctuating states and restore superconducting order at higher temperatures.
Researchers developed a novel method to estimate modulation amplitude and determine spatial resolution in Brillouin optical correlation-domain reflectometry (BOCDR) without costly equipment. This innovation simplifies the process, reducing costs and enhancing convenience.
Scientists have demonstrated spontaneous parametric down-conversion in a liquid crystal, creating entangled photon pairs with high efficiency. The discovery enables flexible and electric-field-tunable quantum light sources.
Researchers at the University of Arizona and Sandia National Laboratories have developed a new class of synthetic materials that enable giant nonlinear interactions between phonons. This breakthrough could lead to smaller, more efficient wireless devices, such as smartphones or other data transmitters.
Researchers at UC San Diego used terahertz time-domain spectroscopy to observe anomalous terahertz light amplification in Ta2NiSe5, uncovering its exciton condensate properties. This technique may allow for the discovery of new light-induced phenomena and their potential applications in entangled light sources.
Researchers at EPFL and Max Planck Institute have successfully bridged the gap between light and electrons using a transmission electron microscope. They achieved this by generating dissipative Kerr solitons that interact with free electrons, allowing for ultrafast modulation of electron beams.
Researchers at UNICAMP developed a new technology to create bridges between superconducting circuits and optical fibers, enabling efficient transmission of information in the electromagnetic spectrum. This breakthrough paves the way for the development of advanced quantum networks with potential applications in computing and communicat...
Researchers have successfully integrated photo-induced superconductivity on a chip using non-linear THz spectroscopy. The electrical response of K3C60 exhibits non-linear behavior, validating previous observations and providing new insights into the physics of this material.
Researchers at Osaka University have created a new optical device that generates deep-UV light using second harmonic generation, killing germs while remaining harmless to humans. The device is more efficient and compact than previous options, paving the way for commercial applications.
Researchers have developed a fully photostable and photoswitchable nanoparticle that can be controlled indefinitely using near-infrared light. This breakthrough has the potential to revolutionize fields such as optical memory, super-resolution microscopy, and bioimaging.
The γ-MnO2 dual-core pair-hole fiber enables the production of an all-fiber mode-locked laser with a pulse width of about 1 ps and a repetition frequency of about 600 MHz. This fabrication scheme offers good stability and is suitable for combining other novel materials with specialty fibers, expanding ultrafast optics and sensing appli...
Researchers have discovered a way to fine-tune quantum dots to enhance their nonlinear optical properties, allowing for tighter control over light emission frequency and brightness. This breakthrough could lead to significant advances in optoelectronic devices such as LEDs and light-based computer circuits.
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 ETH Zurich introduce a novel single-cavity architecture for a dual-comb laser, enabling fast and precise scanning of optical delays. The system achieves high precision (2-fs) and stability (up to 500 Hz) for an optical delay of 12.5 ns, opening up new possibilities for practical applications.
A new type of integrated semiconductor laser has been developed using the Pockels effect, integrating a lithium-niobate-on-insulator platform. This technology enables fast reconfigurability and narrow spectral window, paving the way for applications in LiDAR remote sensing, microwave photonics, atomic physics, and AR/VR.
Researchers at the Max Born Institute have used novel ultrashort soft X-ray spectroscopy to study the fate of molecular nitrogen when an electron is kicked out. They found that the B state has a similar degree of excitation as the X state, contradicting previous models. Instead, a coherent interplay between light fields enables lasing ...
Researchers developed a new method for converting light frequencies using atomically thin layers of molybdenum disulfide, enabling smaller lasers and potential applications in optical communications. The breakthrough could lead to compact phase-matched nonlinear optics and waveguide devices.
Researchers observed a novel type of excitation, called a polaron, where collective oscillations of the electron and its screening cloud arise at terahertz frequencies. These oscillations persist for tens of picoseconds and are impulsively triggered by ultrafast electron localization.
Scientists have demonstrated nonlinear generation and topological tuned confinement of THz waves in an engineered lithium niobate chip. Topological control of THz waves may bring about new possibilities in the realization of THz integrated circuits, reducing scattering loss and decay.
A team of researchers has observed a new kind of wave mixing process involving soft x-rays, allowing for selective tracking of electrons in materials. By analyzing this process, they gain insights into the nature of the material and its electronic structure.