Nanowerk December 6, 2022 Despite remarkable manufacturing advantages, reliance on silicon-based waveguides currently limits the spectral window available to photonic integrated circuits (PICs). A team of researchers in the US (industry, UC Santa Barbara, Caltech) has developed a technique to enable photonic chips to operate in the visible-to-near-infrared spectrum by directly uniting III–V materials with silicon nitride waveguides on Si wafers. Using this technology, they fabricated a fully integrated PIC at photon energies greater than the bandgap of silicon, demonstrating essential photonic building blocks, including lasers, amplifiers, photodetectors, modulators, and passives, all operating at submicrometre wavelengths. Using this platform, they […]
Tag Archives: Integrated circuits
A new platform for integrated photonics
Phys.org August 25, 2021 The quality of photonic integrated circuits are limited due to the high density of crystal defects near growth interface. Researchers in China have fabricated an ultralow loss 4H-SiCOI platform with a record-high-Q factor of 7.1 × 106. The platform was prepared by wafer-bonding than thinning techniques, enabled the same crystalline quality as bulk high-pure 4H-SiC crystal. The high Q resonators were used to demonstrate various nonlinear processes including generation of multiple harmonics up to the fourth order. Broadband frequency conversions, including second-, third-, fourth- harmonic generation have been observed. Using a dispersion-engineered SiC microresonator, Kerr frequency […]