Scientists create ultra-low loss optical device that traps light on a chip

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 Scientists create ultra-low loss optical device that traps light on a chip


Scientists have engineered tiny light-trapping racetracks that could supercharge future sensors and quantum technologies. Credit: AI/ScienceDaily.com Researchers at CU Boulder have developed highly efficient optical microresonators that could support a new generation of powerful sensor technologies.

A microresonator is a microscopic structure designed to confine light in a small space. As light circulates inside, its intensity increases. When that intensity reaches a sufficient level, scientists can carry out specialized optical processes that enable sensing and other advanced functions."Our work is about using less optical power with these resonators for future uses," said Bright Lu, a fourth year doctoral student in electrical and computer engineering and a lead author on the study. "One day these microresonators can be adapted for a wide range of sensors from navigation to identifying chemicals."

The research was published in Applied Physics Letters.

Racetrack Resonator Design Reduces Light Loss

To achieve stronger performance, the team focused on "racetrack" resonators, which are named for their elongated loop shape that resembles a running track. They incorporated "Euler curves" -- a type of smooth curve also found in road and railway design. Just as vehicles cannot navigate sudden right angle turns at speed, light does not travel efficiently through sharp bends.

"These racetrack curves minimize bending loss," said Won Park, Sheppard Professor of Electrical Engineering and a co advisor on the project. "Our design choice was a key innovation of this project."

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