optical

Could axion decay be the basis of excessive cosmic optical background noise?

Could axion decay be the basis of excessive cosmic optical background noise?

SPHEREx (Spectro-Photometer for the History of the Universe, Epoch of Reionization and Ices Explorer), a NASA space observatory designed to explore the origin of the universe, galaxies, and water in planetary systems. Credit: NASA Jet Propulsion Laboratory, Public Domain, via Wikimedia Commons. The Cosmic Optical Background (COB) is the visible light emitted by all sources …

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Whispering gallery modes with fractional optical angular momentum in photonic crystal micro-rings

Whispering gallery modes with fractional optical angular momentum in photonic crystal micro-rings

The left side represents the concept of half-integer angular momentum in the author’s work. The electric field inside the resonator (middle) depends on both the field envelope phase (top) and the angular momentum phase (bottom), each requiring two round trips to return to its original value. A light-carrying half-integer angular momentum can be created by …

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Researchers develop programmable optical device for high-speed beam steering

Researchers develop programmable optical device for high-speed beam steering

Scientists have developed a wireless, programmable spatial light modulator that can manipulate light on the wavelength scale with orders of magnitude faster response than existing devices. 1 credit In a scene from “Star Wars: Episode IV – A New Hope”, R2D2 projects a three-dimensional hologram of Princess Leia making a desperate plea for help. This …

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