Power/Performance Bits: April 20
Multiplexing twisted light; flexible body heat harvesting; carbon quantum dots.
Multiplexing twisted light
Researchers from University of California San Diego and University of California Berkeley found a way to multiplex light by using discrete twisting laser beams from antennas made up of concentric rings.
“It’s the first time that lasers producing twisted light have been directly multiplexed,” said Boubacar Kanté, an Associate Professor at UC Berkeley’s Department of Electrical Engineering and Computer Sciences. “We’ve been experiencing an explosion of data in our world, and the communication channels we have now will soon be insufficient for what we need. The technology we are reporting overcomes current data capacity limits through a characteristic of light called the orbital angular momentum. It is a game-changer with applications in biological imaging, quantum cryptography, high-capacity communications and sensors.”
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College students sit in the shade on the horseshoe at the University of South Carolina. In 2019, its entering class was 6 percent Black in a state where 37 percent of public high school graduates were Black. Credit: Sean Rayford/Getty Images
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Alarms sounded at the University of Maryland when the Class of 2022 arrived at College Park. Seven percent of freshmen in fall 2018 were Black, down from 10 percent the year before and 13 percent in 2014.
Flagship universities say diversity is a priority. But Black enrollment in many states continues to lag. Lauren Lumpkin, Meredith Kolodner, Nick Anderson © Bonnie Jo Mount/The Washington Post University of Maryland seniors Alysa Conway and Saba Tshibaka, seen Thursday on the College Park campus, are organizers with Black Terps Matter, a student group that has been vocal about issues that affect Black students. Alarms sounded at the University of Maryland when the Class of 2022 arrived at College Park. Seven percent of freshmen in fall 2018 were Black, down from 10 percent the year before and 13 percent in 2014. It marked a nadir for a metric crucial to the flagship university’s commitment to diversity in a state where about a third of public high school graduates each year are Black.