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Nonrepeating photonic crystal may enable more tunable, reliable semiconductor lasers‎

Over the past two decades, photonic-crystal surface-emitting lasers (PCSELs) have shown promise as a type of advanced semiconductor laser useful in defense- and aerospace-related applications. Typically, these devices are made with photonic crystal patterns that repeat across the area of the device. But new research from the lab of electrical and computer engineering professor Kent Choquette has demonstrated a quasi-periodic photonic-crystal surface-emitting laser (QPCSEL). Fabricated with their buried dielectric platform, the group's device highlights a new avenue for creating tunable, more reliable semiconductor lasers. Their findings appear in Applied Physics Letters.

15:03
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Phys

Minnesota iron ore could be key to sustainable and lower cost semiconductor‎

For the first time, researchers at the University of Minnesota Twin Cities have demonstrated that the low-purity iron ore prevalent in Minnesota can be used to create semiconductor-quality iron sulfide, also known as "fool's gold" or pyrite. This discovery could have cost-effective and sustainable applications in future electronic devices and other technologies.

15:03
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Phys

Four more belugas arrive at Chicago aquarium from shuttered Canadian theme park‎

Four more belugas have arrived at a Chicago aquarium as part of a plan to move Canada's last remaining captive whales from a shuttered theme park to aquariums in the United States and Spain.

14:45
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Phys

Shackled men in 2,600-year-old Greek mass graves were likely locals, archaeologists find‎

In 2016, archaeologists working at the Phaleron Burial Ground, part of the ancient Attica region, uncovered an astonishing sight: three mass graves dating to the 7th and 6th centuries BCE containing the skeletons of 79 adult men. Many were bound together with metal shackles.

14:29
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Phys

Scientists simulating ant swarms find a 'first mover' can set the colony in motion‎

In ant colonies, a single ant can be the catalyst for a wave of mob activity, launching brief bursts of coordinated movement involving hundreds or even thousands of swarming workers, according to new simulations from New Jersey Institute of Technology.

14:13
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Phys

Black-box technologies could undermine confidence in scientific findings‎

Scientists are increasingly relying on powerful data sources and tools that they often cannot fully understand, inspect or verify, according to a new study.

14:13
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Phys

Hurricane poised to hit Hawaii as El Niño stirs Pacific‎

A strengthening tropical storm named Lala is set to hit Hawaii's Big Island with hurricane-force gales on Saturday, bringing dangerous winds, rainfall and heavy surf.

13:42
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Phys

Extreme weather is making work difficult for many people. This is what needs to change‎

The UK has experienced several heat waves this summer—heat stress among workers is one of the biggest causes of weather-related sick leave. Very high temperatures can cause symptoms like heat rash and cramps, or even exhaustion and heatstroke.

13:12
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Phys

Faced with historic drought, the Dutch rethink water management‎

On the banks of the Waal, the Dutch branch of the Rhine, swimmers are sunning themselves on a Nijmegen beach that didn't exist before the river level dropped a few months ago.

11:08
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Phys

Magnitude 7.7 earthquake strikes off coast of Indonesia and tsunami warning issued‎

A powerful magnitude 7.7 earthquake struck off the coast of Indonesia early Saturday, damaging buildings and homes, and triggering a tsunami warning. Authorities urged people on affected coastlines to move to higher ground.

10:37
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