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December 13, 2021

Two coupled resonators form a figure eight-like structure

In the top device in this illustration, two coupled resonators form a figure eight-like structure. Input light travels from the waveguide through the resonators, entering as one color and emerging as another. The bottom device uses three coupled resonators: a small ring resonator, a long oval resonator called a racetrack resonator, and a rectangular-shaped resonator. As light speeds around the racetrack resonator, it cascades into higher and higher frequencies, resulting in a shift as high as 120 gigahertz.

[Research supported by U.S. National Science Foundation grants ECCS 1839197, ECCS 1541959 and IIP 1827720.]

Learn more in the Harvard SEAS news story Shifting colors for on-chip photonics. (Date image taken: unknown; date originally posted to NSF Multimedia Gallery: Dec. 13, 2021)

Credit: Second Bay Studios/Harvard SEAS

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