ULTRAFAST & NANOSCALE OPTICS GROUP
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  • Home
  • Research
    • Silicon Photonics
    • Active Nanophotonics
    • Sensing & Imaging
    • Meta-Materials & Meta-Devices
  • Publications
  • Members
  • Collaborations
  • Openings
  • Contact

silicon Photonics


Our research in silicon photonics focuses on non-conventional devices as well as at the system level. We design our devices, simulate their performances and fabricate them at the Nano3 cleanroom. We also perform cutting edge applied research in photonics circuits using industrial foundries through Multi-Project Wafer (MPW) runs. We perform in-depth characterizations using the state-of-the-art equipment available in our labs. The targeted applications of our works includes spectroscopy, telecommunication, and microwave photonics to name of few.

Fourier transform spectrometer on silicon with thermo-optic non-linearity and dispersion correction

Miniaturized integrated spectrometers will have unprecedented impact on applications ranging from unmanned aerial vehicles to mobile phones, and silicon photonics promises to deliver compact, cost-effective devices. Mirroring its ubiquitous free-space counterpart, a silicon photonics-based Fourier transform spectrometer (Si-FTS) can bring broadband operation and fine resolution to the chip scale. Here we present the modeling and experimental demonstration of a thermally tuned Si-FTS accounting for dispersion, thermo-optic non-linearity, and thermal expansion. We show how these effects modify the relation between the spectrum and interferogram of a light source and we develop a quantitative correction procedure through calibration with a tunable laser. We retrieve a broadband spectrum (7 THz around 193.4 THz with 0.38-THz resolution consuming 2.5 W per heater) and demonstrate the Si-FTS resilience to fabrication variations—a major advantage for largescale manufacturing. Providing design flexibility and robustness, the Si-FTS is poised to become a fundamental building block for on-chip spectroscopy.
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Hybrid multimode resonators based on grating-assisted counter-directional couplers​

Research thrusts in silicon photonics are developing control operations using higher order waveguide modes for next generation high-bandwidth communication systems. In this context, devices allowing optical processing of multiple waveguide modes can reduce architecture complexity and enable flexible on-chip networks. We propose and demonstrate a hybrid resonator dually resonant at the 1st and 2nd order modes of a silicon waveguide. We observe 8 dB extinction ratio and modal conversion range of 20 nm for the 1st order quasi-TE mode input.
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