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A metasurface hologram is an ultra-thin surface that is capable of arbitrarily shaping and projecting laser beams to extremely wide angles. However, due to the high coherence of laser light and inevitable defects in the metasurface, holographic images produced by meta-holograms suffer from deleterious artifacts that are extremely difficult to remove. A US-China team developed an efficient method to suppress holographic defects by fine-tuning the spatial coherence of laser illumination with a novel laser. ....
By Susan Gonzalez April 26, 2021 Share this with FacebookShare this with TwitterShare this with LinkedInShare this with EmailPrint this Top row: Bergemann, Breaker, Brown, Cao, Casey; Middle row: Hansen, Horwich, Huber, Iwasaki; Bottom row: Johnson, Sigworth, Spielman, Tanner, Washington Fourteen Yale faculty members who work across a range of disciplines last week were among the 252 accomplished individuals elected to the American Academy of Arts & Sciences. Those elected are “extraordinary people who help solve the world’s most urgent challenges, create meaning through art, and contribute to the common good,” said the academy in announcing the new members, who include artists, scholars, scientists, and leaders in the public, nonprofit, and private sectors. ....
Serap Aksoy, Hui Cao, Lieping Chen, and Debra Fischer were elected to the academy, one of the highest honors bestowed on a U.S. scientist or engineer. ....
By William Weir February 26, 2021 Share this with FacebookShare this with TwitterShare this with LinkedInShare this with EmailPrint this A chip detects laser fluctuations to generate random numbers. (credit: Kyungduk Kim) Random numbers are increasingly important to our digitally connected world, with applications that include e-commerce, cryptography, and cloud computing. Producing a large amount of truly random numbers quickly, though, is a challenge. To speed things up, a team of researchers has developed a compact laser that can produce these random numbers 100 times quicker than the fastest current systems. The results are published February 26 in the journal Science. To foil would-be hackers, computer systems need to generate sequences of random numbers. Some systems use what’s known as pseudo-random numbers, which are actually complex patterns that begin with a particular number, or “seed.” They work fine for some applications, but if attackers ....
This Is the Fastest Random-Number Generator Ever Built A laser generates quantum randomness at a rate of 250 trillion bits per second and could lead to devices small enough to fit on a single chip Advertisement Researchers have built the fastest random-number generator ever made, using a simple laser. It exploits fluctuations in the intensity of light to generate randomness a coveted resource in applications such as data encryption and scientific simulations and could lead to devices that are small enough to fit on a single computer chip. True randomness is surprisingly difficult to come by. Algorithms in conventional computers can produce sequences of numbers that seem random at first, but over time these tend to display patterns. This makes them at least partially predictable, and therefore vulnerable to being decoded. ....