Lifeboat Foundation

On the electromagnetic spectrum, terahertz light is located between infrared radiation and microwaves. It holds enormous potential for tomorrow’s technologies: Among other things, it might succeed 5G by enabling extremely fast mobile communications connections and wireless networks. The bottleneck in the transition from gigahertz to terahertz frequencies has been caused by insufficiently efficient sources and converters. A German-Spanish research team with the participation of the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) has now developed a material system to generate terahertz pulses much more effectively than before. It is based on graphene, i.e., a super-thin carbon sheet, coated with a metallic lamellar structure. The research group presented its results in the journal ACS Nano.

Some time ago, a team of experts working on the HZDR accelerator ELBE were able to show that graphene can act as a frequency multiplier: When the two-dimensional carbon is irradiated with light pulses in the low terahertz frequency range, these are converted to higher frequencies. Until now, the problem has been that extremely strong input signals, which in turn could only be produced by a full-scale particle accelerator, were required to generate such terahertz pulses efficiently.“This is obviously impractical for future technical applications,” explains the study’s primary author Jan-Christoph Deinert of the Institute of Radiation Physics at HZDR. “So, we looked for a material system that also works with a much less violent input, i.e., with lower field strengths.”

For this purpose, HZDR scientists, together with colleagues from the Catalan Institute of Nanoscience and Nanotechnology (ICN2), the Institute of Photonic Sciences (ICFO), the University of Bielefeld, TU Berlin and the Mainz-based Max Planck Institute for Polymer Research, came up with a new idea: the frequency conversion could be enhanced enormously by coating the graphene with tiny gold lamellae, which possess a fascinating property: “They act like antennas that significantly amplify the incoming terahertz radiation in graphene,” explains project coordinator Klaas-Jan Tielrooij from ICN2. “As a result, we get very strong fields where the graphene is exposed between the lamellae. This allows us to generate terahertz pulses very efficiently.”

CSIRO has made a detailed radio survey of the southern hemisphere, and discovered a million new galaxies.

Although radio astronomy has been around since the 1930s, it is only in recent years that astronomers have been able to make high-resolution maps of the radio sky. Sky maps are difficult for radio telescopes because radio antennas need to be focused on an extremely small patch of sky to capture images in high resolution. But with modern antennas and computer processing, we can now scan the sky quickly enough to map the heavens in a reasonable amount of time.

In the northern hemisphere, the most detailed radio sky maps have been done by the Very Large Array (VLA). In the 1990s the VLA made the first full-sky surveys of the northern sky. After its upgrade in the 2000s, the observatory began the VLA Sky Survey (VLASS), which has mapped nearly 10 million radio sources.

Continue reading “Australian Radio Telescopes Just Completed a map of the Universe” »

Like.

Scientists unveiled the largest 3D map of the universe ever, showing its expansion rate over 11 billion years.

Interesting…

A 982 megahertz signal dubbed BLC1 (Breakthrough Listen 1) came from the star, as spotted by the Parkes telescope in Australia in April and May 2019. Most tantalizingly, the relatively nearby star system contains a planet dubbed Proxima b, which is about 20 percent larger than Earth and located in the system’s habitable zone, the area where it’s theoretically possible for life to sustain itself.

The news also met with a healthy dose of skepticism. In a statement released today, the SETI Institute commented on the controversial report. The main takeaway: Breakthrough Listen’s discovery is a candidate, not a confirmed signal.

Continue reading “SETI Institute Admits That Proxima Centauri Signal Is Very Strange” »

New military goggles give soldiers a unique way to see the battlefield.

Can we morph cities into energy farms? We sure can now! This turbine catches wind from any direction and generates clean energy, even in dense urban areas!

When it comes to the semiconductor industry, silicon has reigned as king in the electronics field, but it is coming to the end of its physical limits.

To more effectively power the electrical grid, locomotives and even electric cars, Lawrence Livermore National Laboratory (LLNL) scientists are turning to diamond as an ultra-wide bandgap semiconductor.

Diamond has been shown to have superior carrier mobility, break down electric field and thermal conductivity, the most important properties to power electronic devices. It became especially desirable after the development of a chemical vapor deposition (CVD) process for growth of high-quality single crystals.

Crucial test for NASA’s SLS ‘mega-rocket’

Part of a giant rocket that will send humans back to the Moon has undergone a critical test.

SMART CONTACT LENSES are coming during this decade, probably within a few years. This company claims it is ready to launch one that will 1) give night vision to the wearer; 2) record video of what you see with your eyes in real time; 3) zoom magnification up to 60 times larger than regular vision, so if you see something far away, you can see what it is; 4) display “augmented” images on your visual field. This means you will be able to see everything normally, BUT can see a text of the weather, or map directions, etc. Eventually, such contact lenses will replace the smart phone, and you will dial, talk, etc, without use of your hands. I would like this to interface with instant language translation, to make learning a language five times faster!

This innovation, called iLens, looks unbelievable on paper. Associated with a smartphone via Bluetooth, this concept would allow you to record your daily memories in video. A telephoto camera embedded in the lens would allow you to zoom digitally up to 60x to enhance your eyesight and discover details invisible to the naked eye. This digital feat would also allow you to see perfectly in the dark.

ILens would also display augmented reality information, for instance to keep a certain distance from others, or practical information regarding air quality or the weather.

Continue reading “Contact lenses worthy of James Bond to zoom and film in a blink of an eye” »