Lifeboat Foundation

Reliably guiding and capturing optical waves is central to the functioning of various contemporary technologies, including communication and information processing systems. The most conventional approach to guide light waves leverages the total internal reflection of optical fibers and other similar structures, yet recently physicists have been exploring the potential of techniques based on other physical mechanisms.

Researchers at University of Southern California recently devised a highly innovative approach for trapping light. This method, introduced in Nature Physics, exploits the exotic properties of Lagrange points, the same equilibrium points that govern the orbits of primordial celestial bodies, such as so-called Trojan asteroids in the sun-Jupiter system.

“The discovery of Lagrange points, which happens to be pivotal in this research, can be traced back to the early work of Leonhard Euler and Joseph-Louis Lagrange, which found that at these locations, the gravitational attraction exerted by two large bodies can be precisely counterbalanced by centrifugal forces,” Mercedeh Khajavikhan and Demetrios N. Christodoulides, co-authors of the paper, told Phys.org.

Scientists studying sunspots have found important clues about magnetic features in their decay that will help understand the evolution and real origin of these mysterious magnetic phenomena. The findings are published in The Astrophysical Journal.

Understanding sunspots is crucial to understanding the solar cycle, the approximately 11-year periodic change that changes the sun’s energy output and the frequency and intensity of flares it sends into space that can negatively influence satellites and electrical networks on Earth. (The solar “cycle” can range from eight to 14 years in length.)

Sunspots look rather simple from a distance but are complex areas where light from the sun is trapped by twisted magnetic fields. They are temporary regions of reduced temperature that appear as dark spots on the surface of the sun, where constricted magnetic flux suppresses convection that brings the inner heat of the sun to the surface. A sunspot is about the size of the Earth, and they often come in pairs.

Prof. Polshettiwar’s group at Tata Institute of Fundamental Research (TIFR), Mumbai has developed a novel “plasmonic reduction catalyst stable in air,” defying the common instability of reduction catalysts in the presence of air. The catalyst merges platinum-doped ruthenium clusters, with “plasmonic black gold.” This black gold efficiently harvests visible light and generates numerous hot spots due to plasmonic coupling, enhancing its catalytic performance.

The team describes their work in a paper published in the journal Nature Communications.

What sets this catalyst apart is its remarkable performance in the semi-hydrogenation of acetylene, an important industrial process. In the presence of excess ethene, and using only visible light illumination without any external heating, the catalyst achieved an ethene production rate of 320 mmol g⁻¹ h⁻¹ with around 90% selectivity. This efficiency surpasses all known plasmonic and traditional thermal catalysts.

Laser sources operating at the 1.2 μm wavelength band have some unique applications in photodynamic therapy, biomedical diagnosis and oxygen sensing. Additionally, they can be adopted as pump sources for mid-infrared optical parametric generation as well as visible light generation by frequency doubling.

Laser generation at 1.2 μm waveband has been achieved with different solid-state lasers including semiconductor lasers, diamond Raman lasers, and fiber lasers. Among these three types, the fiber laser thanks to its simple structure, good beam quality, and operation flexibility, is a great choice for 1.2 μm waveband laser generation.

Researchers led by Prof. Pu Zhou at National University of Defense Technology (NUDT), China, are interested in a high power fiber laser at 1.2 μm waveband. Current high power fiber lasers are mostly ytterbium-doped fiber lasers at 1 μm waveband, and the maximum output at 1.2 μm waveband is limited at 10-watt level.

Evolutionary biologists at Johns Hopkins Medicine report they have combined PET scans of modern pigeons along with studies of dinosaur fossils to help answer an enduring question in biology: How did the brains of birds evolve to enable them to fly?

The answer, they say, appears to be an adaptive increase in the size of the cerebellum in some fossil vertebrates. The cerebellum is a brain region responsible for movement and motor control.

The research findings are published in the Jan. 31 issue of the Proceedings of the Royal Society B.

Sun Somei continues sharing behind-the-scenes sneak peeks at their new commercial.

Nice!

XReal’s AR glasses aim to be an affordable alternative to Apple’s pricier Vision Pro, CEO Chi Xu told Bloomberg.

The findings aren’t as simple as increased detection, seen with increases in late-stage cancer for white women and mortality among Black women.

https://www.youtube.com/watch?si\u003dGp5uRChnBm-OuMqT\u0026v\u003d1Kt58VJCt5c\u0026feature\u003dyoutu.be

RN, BSN, breelyn wilky, MD, denise castillo, tessa mcspadden, stephanie hill, MA, CCRP, and tiffany cull.