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James Webb telescope detects most distant dormant black hole, invisible in all wavelengths and weighing as much as 6 billion suns
James Webb telescope detects most distant dormant black hole, invisible in all wavelengths and weighing as much as 6 billion suns JWST found a black hole hiding in a galaxy more than 10 billion light-years away from Earth, and used a cosmic magnifying glass to determine its mass. The James Webb Space Telescope has spotted the most distant, dormant black hole in the known universe , hiding in a galaxy more than 10 billion light-years from Earth. The newly analyzed black hole, located in a...
Wavelength-selective nonlinear wavefront control in resonant thin-film lithium niobate metasurfaces
arXiv:2601.21382v2 Announce Type: replace Abstract: Nonlinear metasurfaces offer compact control over frequency conversion and wavefront shaping. However, existing approaches, often based on geometric phase, lack wavelength selectivity, resulting in static nonlinear responses. Here, we demonstrate a thin-film lithium niobate metasurface that enables spectrally selective shaping of second-harmonic generation through resonance-engineered phase control.
Single-Photon Infrared Imaging with a Silicon Camera Based on Long-Wavelength-Pumping Two-Photon Absorption
Announce Type: new Abstract: We experimentally demonstrated an ultra-sensitive imaging system for telecom photons based on the non-degenerate two-photon absorption in a silicon-based electron multiplying charge-coupled device (EMCCD). The proposed long-wavelength-pumping scheme with mid-infrared pulsed excitation could not only effectively increase the two-photon absorption coefficient, but also significantly suppress the background noise caused by the harmonic absorption of the strong...
Revealing Wavelength- and Size-Dependent CO2 Reduction Selectivity via Operando Scanning Photo-Electrochemical Microscopy
Announce Type: new Abstract: Controlling product selectivity in plasmonic catalysis, particularly in CO2 reduction (CO2R), remains a central unsolved challenge with direct implications for light-driven fuel and chemical synthesis. Here, we deploy quantitative operando scanning photoelectrochemical microscopy (photo-SECM) to provide a direct demonstration that tuning photon energy switches CO2R selectivity through an electronically driven pathway. On plasmonic Au/p-GaN photocathodes,...
Echo Enhanced Strong Focusing for Coherent Short-Wavelength Radiation
arXiv:2606.08622v1 Announce Type: new Abstract: Storage-ring-based fully coherent light sources, including steady-state microbunching (SSMB), as well as compact seeded FELs driven by laser plasma accelerators, typically have relatively large intrinsic energy spreads. Extending the spectral reach of these facilities toward the X-ray regime represents a major challenge, as existing seeded schemes require rather extreme parameters to generate appreciable microbunching at high harmonics. In this...
Ultrafast and long-term stability Integrated Pockels laser with thin-film PZT
Announce Type: new Abstract: Integrated tunable lasers are central to coherent communications, wavelength-routed optical interconnects, spectroscopy and frequency-modulated continuous-wave LiDAR, yet chip-scale sources rarely combine broad wavelength coverage, nanosecond switching, high spectral purity and stable high-power operation. Here we demonstrate a frequency-agile hybrid external-cavity laser enabled by the Pockels effect in thin-film lead zirconate titanate (PZT). The strong linear...
A Mid-Infrared Platform Based on Strontium Tweezer Arrays
arXiv:2606.02560v1 Announce Type: new Abstract: Subwavelength atomic tweezer arrays, in which atoms can be positioned at distances smaller than their emission wavelength, have been proposed as a versatile platform to study collective emission phenomena, such as superradiance and subradiance. Experimentally, the realization of such arrays has been a challenge as typical emission wavelengths in the visible or near-infrared are short compared to typical tweezer spacings in the micrometer range....
Magnon momentum microscopy: A new window into nanoscale spin-wave physics
Magnon momentum microscopy: A new window into nanoscale spin-wave physics Sadie Harley Scientific Editor Robert Egan Associate Editor An international team led by the Max Born Institute has developed a new type of momentum microscopy to image magnons—the quanta of collectively excited spins—directly in two-dimensional reciprocal space using soft X-rays. Owing to its remarkable sensitivity, simplicity, and access to nanometer-scale wavelengths, this novel technique establishes a powerful and...
These record-breaking black hole winds could create a category 79 hurricane on Earth
These record-breaking black hole winds could create a category 79 hurricane on Earth "This wind is unlike anything on Earth." Astronomers have discovered a distant quasar — or active nucleus of a galaxy — that's powered by a feeding supermassive black hole blasting out winds at record-breaking speeds of 30% the speed of light, around 201 million miles (323 million kilometers) per hour. This is the fastest black hole wind seen specifically in ultraviolet wavelengths.
Record ultraviolet quasar wind reaches 30% light speed near supermassive black hole
Record ultraviolet quasar wind reaches 30% light speed near supermassive black hole Gaby Clark Scientific Editor Robert Egan Associate Editor A team led by York University researchers has discovered the fastest wind near a supermassive black hole ever found at ultraviolet wavelengths, driven by the disk of matter (quasar) surrounding the black hole. "This quasar has a black hole of 1.7 billion times the mass of the sun. What's not typical is that it has gas moving towards us at 30% of the...