Switching the Twist in X Rays with Magnets
2Department of Applied Physics, University of Salamanca, Salamanca, Spain
March 15, 2021•
Physics 14, 34
Scientists create a pattern of nanomagnets called an artificial spin ice that can control the orbital angular momentum of a scattered x-ray beam.
Figure 1: Two strategies for generating orbital angular momentum (OAM) in light. The left side shows a 1D-like microstructure, called a fork-dislocation hologram, which is commonly used to generate OAM beams in visible light. The right side shows a 2D nanomagnet array, called an artificial spin ice, which was used by Woods, Chen, and colleagues to generate x-ray OAM beams. Structural (charge) scattering generates even-order beams (red doughnuts), while magnetic (spin) scattering generates odd-order beams (blue doughnuts).Two strategies for generating orbital angular momentum (OAM) in light. The left side shows a 1D-like microstructure, called a fork-dislocation hologram, which is c
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Opalescent inshore squid (
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Scientists have long been fascinated by this squid s remarkable camouflage and communication. New research has brought us even closer to figuring out how they can pull off such an eclectic wardrobe that allows them to hunt near the brightness of the shore, slip by predators unseen, or even evade aggressive suitors by flashing a pair of fake testes.
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IMAGE: A new $7.5 million Department of Defense grant is seeking to build a super camera that combines multiple metasurfaces that together can extract almost every bit of information that light. view more
Credit: Mark Brongersma, Stanford
DURHAM, N.C. - Engineers at Duke University are leading a nationwide effort to develop a camera that takes pictures worth not just a thousand words, but an entire encyclopedia.
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