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Related Experiment Video

Updated: Jan 25, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Modelling spontaneous four-wave mixing in periodically tapered waveguides.

Mohammed F Saleh

    Optics Express
    |May 5, 2019
    PubMed
    Summary

    Periodically tapered waveguides enhance photon-pair generation in nonlinear materials. This technique, using sinusoidally varying cross-sections, offers efficient, on-demand parametric interactions for quantum technologies.

    Area of Science:

    • Nonlinear optics
    • Quantum optics
    • Materials science

    Background:

    • Quasi-phase-matching (QPM) schemes are crucial for efficient parametric interactions in nonlinear materials.
    • Periodically tapered waveguides offer a novel approach to achieve QPM, particularly in third-order nonlinear systems.
    • Spontaneous photon-pair emission is a key process for quantum information applications.

    Purpose of the Study:

    • To investigate the enhancement of spontaneous photon-pair emission using periodically tapered waveguides.
    • To explore this technique in microstructured fibers and planar waveguides with sinusoidal cross-sections.
    • To develop a quantum model for analyzing continuous and pulsed-pump excitations in such structures.

    Main Methods:

    • Development of a general, robust quantum model incorporating self- and cross-phase modulations.

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  • Simulation of photon-pair generation under continuous and pulsed-pump excitation.
  • Analysis of waveguides with sinusoidally varying cross-sections.

    • Main Results:

    • Significant enhancement in photon-pair generation was observed.
    • The enhancement is particularly notable in waveguides with a small number of tapering periods.
    • The proposed method is compatible with current fabrication technologies.

    Conclusions:

    • Periodically tapered waveguides are a promising technique for enhancing on-demand parametric interactions.
    • The developed quantum model provides a valuable tool for studying these nonlinear processes.
    • Further optimization of tapering patterns can tailor spectral properties of generated photons for quantum applications.