Articles tagged with Harmonics
A novel capacitorless solid-state power filter (SSPF) has been developed for single-phase DC-AC converters, eliminating the need for LC filters and dc-link capacitors. The proposed concept demonstrates a significant reduction in critical components, leading to enhanced efficiency and reliability.
Research team identifies seismic signature of individual songs and determines strength of each song's tremor, finding that audience movement, not music, was the primary source of harmonic tremors. The study also compares data from Swift's LA concert to other Summer 2023 SoFi concerts.
Researchers have found that stacking order and lateral strain can significantly enhance second harmonic generation (SHG) in 2D Janus hetero-bilayers. The study demonstrates a threefold increase in SHG intensity with AA stacking, which is four times higher than AB stacking.
A team of archaeologists has found evidence of intentionally crafted limestone spheroids at the Ubeidiya site, dating back 1.4 million years. The discovery challenges existing beliefs about early hominin capabilities and technological achievements, suggesting a desire for symmetrical shapes in stone.
Researchers at Shanghai Jiao Tong University have developed a new scattering matrix method that can sculpt light output with minimal optimization time. The method offers unparalleled nonlinear scattered light control, enabling high-resolution scanning microscopy and particle trapping through dense, scattering media.
Scientists have successfully measured the speed of molecular charge migration in a carbon-chain molecule, revealing a movement of several angstroms per femtosecond. The study used a two-color high harmonic spectroscopy scheme with machine learning reconstruction to achieve a temporal resolution of 50 as.
Researchers have discovered a way to utilize nonlinear scattering media for optical computing and machine learning. They created a novel theoretical framework involving third-order tensors, which can represent the complex relationships between input and output signals. This breakthrough has potential applications in real-world settings...
Researchers have developed a method to generate mid-infrared pulses with dual-wavelength spectral shaping, enabling flexible tunability in both temporal and spectral domains. This allows for enhanced High-Harmonic generation (HHG) control, opening new possibilities for applications such as electron dynamics and light-matter interaction.
Paderborn researchers develop innovative approach to generating higher harmonics in silicon metasurfaces, increasing efficiency through the Fano effect. The study enables third harmonics to be generated much more efficiently than with previous known structures.
Researchers develop unique method to enhance extreme ultraviolet laser power by exploiting dark-autoionizing states, increasing conversion efficiency by over ten times. This breakthrough enables studying ultrafast dynamics of dark autoionizing states at the femtosecond timescale, with potential applications in quantum technologies.
Scientists successfully record phase distribution of electrons, unveiling detailed structure of its complex wavefunction. The method uses attosecond laser pulse to visualize electron wavefunction in a gas.
Topological insulators exhibit unique quantum properties, with electrons flowing freely along surface edges but not through the interior. Researchers used spiraling laser light to generate harmonics from materials, allowing them to distinguish between superhighway and insulating states. By varying laser polarization and material compos...
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.
Tel Aviv University researchers develop innovative model that explains wave formation, tested in complex experiments. The model takes into account all unstable harmonics and limitations of previous models, providing high reliability for describing physical situation.
Researchers at Kyoto University have discovered a scaling law that determines high-order harmonic generation in the perovskite material Ca2RuO4. The phenomenon, which was first observed in atomic gas systems, has been found to be highly dependent on temperature and gap energy.
Researchers at Duke University have developed a device that manipulates particles and cells using complex sound waves, enabling selective pairing of individual cells to measure adhesion forces. This technology could lead to personalized medicine by allowing doctors to determine treatment for individual cancer patients.
Researchers have developed a direct method for generating complex structured light through intracavity nonlinear frequency conversion. This technique uses transverse mode locking to produce vortex beams, which are then converted into second-harmonic generation beams with distinct structural characteristics. The study demonstrates the p...
Researchers at Johns Hopkins APL aim to create an ideal baby monitor that filters out unwanted noises, ensuring parents don't miss infant cries. The team's open-source device uses audio processing hardware to filter out background sounds, improving the overall baby monitoring experience.
A team led by Prof. Dr. Maria Hoflund developed a method to focus broadband XUV radiation with a high demagnification factor, enabling the creation of high-intensity XUV pulses with attosecond pulse duration.
Scientists confirmed that topological insulators produce a unique signature from their surface when exposed to circularly polarized laser light. This discovery was made possible by high harmonic generation, which enhances the signal coming from the surface and gives it a distinctive signature.
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 found that male mosquitoes' ability to harmonically converge affects their offspring's immune response, with males investing more energy in mating effort than immunity. Female mosquitoes are better able to resist parasites and pathogens, but may lose immunity as they age.
Researchers at Skolkovo Institute of Science and Technology used the Zhores supercomputer to develop a new method for generating gamma-ray combs, which are essential for nuclear spectroscopy and medicine. The method uses polarization-gated pulses to reduce ponderomotive spectral broadening, allowing for high-brightness gamma-ray sources.
Researchers propose two information transition mechanisms for spatiotemporal metasurfaces: group extension and independent control of multiple harmonics. These mechanisms enable accurate manipulations of electromagnetic information and open up new possibilities for multitasking and wireless communications.
Researchers at Columbia University School of Engineering and Applied Science have developed a new technique to control optical nonlinearity in 2D materials. The twistoptics approach enables giant nonlinear optical responses in small volumes, leading to compact laser systems and potential applications in quantum computing, spectroscopy,...
Scientists have developed a laser-driven soft X-ray source using an antiresonant gas-filled hollow core fibre, achieving a record-breaking 100 kHz-class repetition rate. This breakthrough technology offers a compact, high-flux SXR source suitable for various applications in fundamental and applied sciences.
Researchers have developed a femtosecond laser with unprecedented precision and stability, allowing for the observation of chemical transformations inside cells and the creation of ultra-thin layers on microchips. The laser's harmonic mode locking system enables precise control over pulse frequencies, opening up new avenues for applica...
Researchers developed an all-optical attosecond few slit interferometer to measure ultrafast processes in the time-energy domain. The technique uses laser-driven high order harmonics and introduces a perturbing field to alter harmonic generation, enabling wave-front controlled attosecond interferometry with precise energy resolution.
Scientists have developed a paper-based mechanical memory board by folding paper using the Kresling pattern, generating a switch that can be controlled using vibrations. By placing multiple switches on a single platform, researchers created a functioning mechanical memory board with wide applicability for future device development.
Researchers discovered three stages of preservation: water transporting antimicrobial metal cations, followed by fiber swelling and inorganic crust formation, and gradual silicification. The study provides insight into nanoscale mineralization and its role in preserving ancient textiles.
The study reveals that applying strain to monolayer AlN crystals can enhance the efficiency of even and odd harmonics radiated under ultrafast laser excitation. Researchers found that strain-dependent electronic transitions result in different harmonic spectra, providing a new reference for studying semiconductor dynamics.
Researchers measured radial pulse waves at the wrist to identify artery changes in menopausal women, which were not evident in standard blood pressure measurements. The study found that specific harmonic amplitudes in radial pulse waves reflected changes during menopause and may shed light on atherosclerosis progression.
A bright source of femtosecond soft X-ray pulses has been created using extreme high-order harmonic generation process. This enables the simultaneous local probing at both carbon and nitrogen sites within molecules, facilitating multiple-site investigation with potential correlations between these sites upon molecular rearrangements.
Researchers create a programmable time-domain digital coding metasurface that can respond to electromagnetic waves with strong nonlinear processes. The metasurface enables simultaneous wave-matter interactions and frequency spectrum manipulation, paving the way for simplified and compact communication systems.
Researchers at Samara University developed an ultralight diffraction optic that weighs just 5 grams, compared to a massive system of lenses and mirrors weighing 500 grams. The new technology enables high-resolution images with comparable quality to consumer cameras and mobile phones.
Researchers developed a nonlinear elastic metasurface that can convert a soundwave's fundamental frequency to its second harmonic, advancing noise control technologies. This concept could isolate low frequencies, making it easier to absorb them, and potentially lead to new acoustic devices like diodes and transistors.
Physicists at MSU used high harmonics spectroscopy to study the behavior of electrons in a dielectric material. They found that ultra-short laser pulses can turn the material into a conductor by increasing its kinetic energy and changing its many-body state.
Scientists have discovered a new method to generate terahertz frequencies, long considered challenging to source, using an infrared frequency comb. The innovative system produces extremely pure terahertz tones, opening up new applications for wireless communications and high-speed digital communication.
A new study published in Frontiers in Human Neuroscience has found that the harmonic structure of pop songs is linked to their placement in the Billboard Top 100 charts. The research analyzed chord-by-chord transcriptions of 545 songs and found that rare chords and surprising harmonies are key factors in a song's popularity.
Researchers at Eindhoven University of Technology have created a breast-friendly method for detecting cancer without radiation, generating 3D images with improved accuracy. The new technology uses echography and blood vessel structure analysis to identify cancerous tumors.
Researchers have developed an optical frequency divider with unprecedented precision, enabling arbitrary optical frequency conversions. This breakthrough paves the way for improved applications in optics, metrology, and atomic physics.
UNSW researchers have identified a link between the physical structure of brains and spontaneous patterns of brain function at rest. The study uses harmonic waves to explain how brain shape influences resting brain activity, which could lead to new diagnosis techniques for disorders of consciousness.
Researchers created an audio lure using the frequency of a female mosquito's wings, attracting 95% of male mosquitoes. The device costs around $20 and can be run for weeks. Scientists also found that females are oblivious to male wing beats, making this technology a promising solution to control mosquito populations.
Researchers demonstrated the fabrication of high-Q LN microresonators using femtosecond laser micromachining, achieving efficient second harmonic generation (SHG) in the visible wavelength range. The normalized conversion efficiency of SHG was measured to be 1.35×10-5 /mW.
Researchers found a new type of multipolar order in strontium-iridium oxide, which could lead to breakthroughs in electronic device functionalities and high-temperature superconductivity. The discovery was made using an optical harmonic generation technique that exploits changes in crystal symmetry.
A research team at Georgia Institute of Technology has realized a nonlinear material with opposite refractive indices at the fundamental and harmonic frequencies of light, as predicted theoretically. This discovery has significant implications for controlling light in information processing, sensing, and signal generation.
Researchers track attosecond processes in methyl fluoride and methyl bromide molecules, revealing restructuring of electron shells caused by ionizing laser pulses. This method opens up new possibilities for studying fine chemical processes critical to molecular biology.
Researchers analyzed hermit thrush songs and found notes related by simple integer proportions, similar to human musical scales. The study suggests that hermit thrushes actively select pitches following the harmonic series, possibly due to easier memory or evaluation by females.
Researchers develop theoretical framework to generate coherent radiations in the water window range, enabling high-contrast imaging of biological samples. The study extends previous work on hydrogen and applies it to argon atoms, paving the way for improved spectroscopy techniques.
New research suggests that bats' brains use the temporal binding hypothesis to focus on targets in cluttered scenes, which could inspire new navigation technology. By studying bat echolocation, scientists have developed a better understanding of how to design radar and sonar systems for real-time performance.
Researchers at Kansas State University are developing a way to enhance high-order harmonics to create powerful small tabletop light sources. They propose synthesizing two- or three-color laser fields to optimize harmonic intensity, potentially leading to new applications in science and technology.
Researchers analyze seismic activity at Alaska's Redoubt Volcano, documenting a sudden increase in tremor frequency just before six eruptions. This unique phenomenon may help scientists refine models and better understand volcanic pressurization.
Researchers use harmonic generation microscopy to create high-resolution maps of skin cells, revealing increased sizes of basal keratinocytes and nuclei with natural aging. The findings provide an index for scoring natural or intrinsic skin aging, which could help monitor skin health and test effectiveness of anti-aging treatments.
Researchers have optimized a type of optical resonator to boost infrared signals to higher-energy ultraviolet beams using low-power nonlinear processes. This enables the creation of low-cost, wavelength-tunable ultraviolet sources with applications in chemical detection, medical imaging and fine lithography.
Researchers at Brown University discovered how bats can distinguish between target echoes and background clutter using subtle changes in sound intensity. By delaying their neural response to weaker echoes, bats can effectively 'defocus' clutter, maintaining a clear image of the target.
Research at Duke University reveals that music scales are based on the physics of the human voice, mirroring speech's emotional content. This study provides new insights into why humans appreciate music, suggesting it mimics speech's emotional expression.
Researchers at Cornell University discovered that male and female mosquitoes (Aedes aegypti) create a harmonic duet just before mating. The frequency of this duet is approximately 400-600 hertz for the female and 600-1200 hertz for the male, significantly above previously thought limits.
Researchers at USC created an AI system called ASSA that can generate harmonious musical accompaniment in the style of a chosen artist. The system uses machine learning techniques to analyze melodic and harmonic patterns, allowing users to input their desired melody and receive an accompanying chord progression.
A Penn State team has shown that non-magnetic materials can have more properties than previously thought, thanks to their unique structure and symmetry. The researchers found that certain non-magnetic materials can exhibit roto second harmonic generation, a property previously associated with magnetic materials.
A harmonic scalpel with ultrasound technology can reduce blood loss, postoperative facial paralysis, and infection rates in patients requiring salivary gland removal. The study compared conventional surgery to harmonic scalpel parotidectomy for benign or malignant disease.