Multimedia Release 24-Nov-2021 Shifting colors for on-chip photonics On-chip frequency shifters in the gigahertz range could be used in next generation quantum computers and networks Peer-Reviewed Publication Harvard John A. Paulson School of Engineering and Applied Sciences image: In the top device, 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. view more Credit: Second Bay Studios/Harvard SEAS Journal Nature DOI 10.1038/s41586-021-03999-x Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.