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Colloidal quantum dot photodiodes integrated on metasurfaces for compact SWIR sensors

This week, at the IEEE International Electron Devices Meeting (IEDM 2025), imec, a research and innovation hub in advanced semiconductor technologies, successfully demonstrated the integration of colloidal quantum dot photodiodes (QDPDs) on metasurfaces developed on its 300 mm CMOS pilot line. This pioneering approach enables a scalable platform for the development of compact, miniaturized shortwave infrared (SWIR) spectral sensors, setting a new standard for cost-effective and high-resolution spectral imaging solutions.

Reading the 'light fingerprints' of dead satellites

There are already tens of thousands of pieces of large debris in orbit, some of which pose a threat to functional satellites. Various agencies and organizations have been developing novel solutions to this problem, before it turns into full-blown Kessler Syndrome. But many of them are reliant on understanding what is going on with the debris before attempting to deal with it.

Unlocking the sun's magnetic secrets: AI-powered mapping unlock intricate 3D details

Researchers at the University of Hawaiʻi Institute for Astronomy (IfA) are helping reshape how scientists study the sun. The UH-led team has developed a new artificial intelligence (AI) tool that can map the sun's magnetic field in three dimensions with unprecedented accuracy, supporting research tied to the U.S. National Science Foundation (NSF) Daniel K. Inouye Solar Telescope built and managed by the NSF National Solar Observatory (NSO) on Haleakalā.

The shape of sand grains reveals the distance traveled by rivers

A team from the Centro Nacional de Investigación sobre la Evolución Humana (CENIEH) has collaborated with researchers from the University of Málaga (UMA) and the University of Córdoba (UCO) on an article published in the Journal of Sedimentary Research, which examines the relationship between the shape of sand grains and the distance traveled in the Arlanzón River (Burgos) and the Guadalhorce River (Málaga).

The surprising theology inside today's Advent calendars

It would be easy to conclude that Advent calendars—usually with 25 compartments that reveal a treat, image or scripture, used to count down the days from Dec. 1 to Christmas Eve—represent just another way Christmas is ruined by commercialization. They've strayed far from their beginnings as devotional aids for 19th-century German Lutheran families.

Tracing a path through photosynthesis to food security

The energy that plants capture from sunlight through photosynthesis provides the source of nearly all of humanity's food. Yet the process of photosynthesis has inefficiencies that limit crop productivity, especially in a rapidly changing world. A new review by University of Illinois scientists and collaborators reflects on how improving photosynthesis can bring us closer to food security.

Q&A: Why prosperity in the U.S. and India now rise—or fall—together

As global economic relationships evolve, Achyuta Adhvaryu, professor of economics at the University of California San Diego School of Global Policy and Strategy and director of the 21st Century India Center, says one partnership stands out for its potential to drive shared prosperity: the connection between the United States and India. His research highlights how the two nations' economies have become deeply intertwined through flows of talent, technology and innovation—and why keeping those ties strong is essential for growth on both sides.

With feathers into the afterlife: New results on the Bad Dürrenberg shaman burial

The approximately 9,000-year-old grave of the shaman from Bad Dürrenberg (Saalekreis district) is one of the most spectacular finds in Central European archaeology. Excavated under considerable time pressure in 1934, subsequent investigations at the site from 2019 onwards allowed for the recovery of remains of the burial pit, which were then removed as a block and examined under laboratory conditions. These investigations revealed a series of new insights. Microscopic evidence has now been obtained of feathers that likely belonged to an elaborate headdress.

Dual substitution induces room-temperature ferromagnetism and negative thermal expansion in BiFeO₃

Using a dual-cation substitution approach, researchers at Science Tokyo introduced ferromagnetism into bismuth ferrite, a well-known and promising multiferroic material for next-generation memory technologies. By replacing ions at both the bismuth and iron sites with calcium ions and heavier elements, they modified the spin structure and achieved ferromagnetism at room temperature. Additionally, negative thermal expansion was observed. This ability to engineer magnetism and thermal expansion in a multiferroic material aids in realizing future memory devices.

When the Atlantic creeps closer: Study helps vulnerable Massachusetts peninsula prepare for rising sea levels

On many days, Apple Street looks like a picture postcard of New England. Oaks shade a time-worn stone wall, boat sheds loll behind granite outcrops. But during storms, this pretty lane only a few feet above sea level can turn into a moat, cutting off an emergency shortcut that ambulances count on when Essex's main street floods several times per year.

Ear piercings marked one of the earliest Maya rites of passage, research shows

In a recent study, Ph.D. candidate Yasmine Flynn-Arajdal studied iconographic representations of children in the Classic (ca. 250–950 AD) and Post-classic (ca. 950–1539 AD) imagery, as well as in ethnohistoric and ethnographic literature, to determine the importance of ear ornaments in Maya childhood and by what age they were received.

The solution to finding an atmosphere on TRAPPIST-1 e

The hunt is on for terrestrial exoplanets in habitable zones, and some of the most promising candidates were discovered almost a decade ago about 40 light-years from Earth. The TRAPPIST-1 system contains seven terrestrial planets similar to Earth, and four of them may be in the habitable zone. The star is a dim red dwarf, so the habitable zone is close to the star, and so are the planets. For that reason, astronomers expect them to be tidally-locked to the star.

'Artificial intelligence' myths have existed for centuries—from the ancient Greeks to a Pope's chatbot

It seems the AI hype has turned into an AI bubble. There have been many bubbles before, from the Tulip mania of the 17th century to the derivatives bubble of the 21st century. For many commentators, the most relevant precedent today is the dotcom bubble of the 1990s. Back then, a new technology (the World Wide Web) unleashed a wave of "irrational exuberance." Investors poured billions into any company with ".com" in the name.

Meaning drives young musicians—but few get the chance

Music students are driven both by career ambitions and by a strong personal relationship with music. At the same time, unequal conditions early in life shape who gains access to the music education field. This is shown in a new doctoral dissertation in music education from the University of Gothenburg.

Rare image of Tatooine-like planet is closest to its twin stars yet

In a discovery that's fit for a movie, Northwestern University astronomers have directly imaged a Tatooine-like exoplanet, orbiting two suns. While obtaining an image of a planet beyond our solar system is already rare, finding one that circles two suns is even rarer. But this new world is extra exceptional. It hugs its twin stars more tightly than any other directly imaged planet in a binary system. In fact, it is six times closer to its suns than other previously discovered exoplanets.