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Raman gap solitons

Winful1, Perlin

  • 1Department of Electrical Engineering and Computer Science, University of Michigan, 1301 Beal Avenue, Ann Arbor, Michigan 48109-2122, USA.

Physical Review Letters
|October 6, 2000
PubMed
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Researchers demonstrate a novel Raman gap soliton, a stable light pulse, generated using a nonlinear periodic structure. This excitation persists after the initial pulse, offering potential applications in photonics.

Area of Science:

  • Nonlinear optics
  • Condensed matter physics
  • Photonics

Background:

  • Nonlinear periodic structures exhibit unique optical properties, including photonic band gaps.
  • Solitons are self-reinforcing solitary wave packets that maintain their shape while propagating.
  • Raman scattering involves inelastic scattering of light, leading to frequency shifts.

Purpose of the Study:

  • To investigate the excitation of gap solitons in nonlinear periodic structures via off-Bragg pumping.
  • To explore the characteristics and stability of solitons generated through Raman scattering.
  • To identify potential experimental platforms for observing these phenomena.

Main Methods:

  • Utilizing an intense pump pulse detuned far from the Bragg resonance of a nonlinear periodic structure.

Related Experiment Videos

  • Analyzing the generation of gap solitons at wavelengths corresponding to the medium's Raman shift.
  • Investigating the stability and velocity of the generated solitons.

    • Main Results:

    • Successfully excited a stable, long-lived, quasistationary Raman gap soliton within the band gap.
    • Observed both stationary solitons and slow solitons with velocities down to 1% of the speed of light.
    • The soliton persists even after the pump pulse has passed.

    Conclusions:

    • Raman gap solitons can be generated and sustained in nonlinear periodic structures.
    • These solitons exhibit remarkable stability and controllable velocities.
    • The predicted phenomena are experimentally feasible in fiber Bragg gratings and similar photonic band gap structures.