12 Oct '17, 8pm

Topological Laser Cavities Could Revolutionize Optoelectronics

Topological Laser Cavities Could Revolutionize Optoelectronics

A new type of laser cavity that builds off a Nobel-winning development in physics can take on any shape and switch the flow of light with a magnetic field. “Being able to do this kind of thing with light is a very exciting prospect,” says Boubacar Kante , a physicist at the University of California, San Diego. Kante and his colleagues describe their so-called topological cavities in the current issue of Science . Normally, a laser cavity, where light amplification takes place, is shaped like a ring. If it had sharp corners, some of the light would be lost and the laser wouldn’t work as well. One result of the ring shape is that if engineers want to place many lasers on a chip—say for optical communications or computing—there’s a lot of wasted space between the rings. Kante’s group overcomes that constraint on shape by creating a topological cavity. They built quantum wells...

Full article: https://spectrum.ieee.org/tech-talk/semiconductors/optoel...

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