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Ultrafast optical control using the Kerr nonlinearity in hydrogenated amorphous silicon microcylindrical resonators.

N Vukovic1, N Healy, F H Suhailin

  • 1Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK.

Scientific Reports
|October 8, 2013
PubMed
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Hydrogenated amorphous silicon microresonators exhibit significant Kerr nonlinearity, enabling ultrafast all-optical modulation and switching. These findings pave the way for low-power, high-speed silicon photonic technologies.

Area of Science:

  • Photonics and optical engineering
  • Nonlinear optics
  • Materials science

Background:

  • Microresonators offer unique advantages for studying light-matter interactions due to their small mode volumes and high quality factors.
  • Semiconductor microresonators, particularly those with high Kerr nonlinearity, are crucial for developing high-speed, low-power all-optical processing technologies.
  • Hydrogenated amorphous silicon (a-Si:H) possesses large nonlinear optical properties suitable for photonic applications.

Purpose of the Study:

  • To experimentally characterize the Kerr-induced resonance wavelength shift in a hydrogenated amorphous silicon microresonator.
  • To demonstrate the potential of these resonators for ultrafast all-optical modulation and switching applications.
  • To assess the energy threshold for all-optical switching in a-Si:H microresonators.

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Last Updated: May 7, 2026

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Main Methods:

  • Fabrication of microcylindrical resonators using hydrogenated amorphous silicon.
  • Characterization of nonlinear optical response through measurement of resonance wavelength shifts under optical pumping.
  • Experimental demonstration of all-optical modulation and switching using the Kerr effect.

Main Results:

  • Observed significant Kerr-induced resonance wavelength shifts at low pump powers.
  • Demonstrated ultrafast all-optical modulation and switching capabilities.
  • Achieved switching energy thresholds below one picojoule.

Conclusions:

  • Hydrogenated amorphous silicon microresonators exhibit strong Kerr nonlinearity and mode confinement, leading to efficient wavelength shifting.
  • The demonstrated low switching energy thresholds highlight the potential for developing energy-efficient, high-speed silicon-based photonic devices.
  • These findings represent a significant advancement towards practical low-power all-optical processing technologies.