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Engineering AlGaAs-on-insulator toward quantum optical applications.

Marlon Placke, Sven Ramelow

    Optics Letters
    |December 16, 2020
    PubMed
    Summary

    This study demonstrates how embedding aluminum gallium arsenide in dielectric cladding enhances its nonlinear optical properties. Simulations show potential for improved quantum optical sources and novel photon-photon interactions.

    Area of Science:

    • Optoelectronics and Photonics
    • Materials Science
    • Quantum Optics

    Background:

    • Aluminum gallium arsenide (AlGaAs) offers significant nonlinear optical properties.
    • Nanoscopic structuring of AlGaAs is achievable via epitaxial growth and lithography.
    • A large bandgap is crucial for broadband, low-loss optical operations.

    Purpose of the Study:

    • To explore the potential of AlGaAs for integrated parametric optical interactions.
    • To investigate the enhancement of nonlinear interactions by embedding AlGaAs in dielectric cladding.
    • To present simulation-based evidence for improved quantum optical sources.

    Main Methods:

    • Utilizing simulations to model AlGaAs waveguides clad with dielectric materials.
    • Analyzing second- and third-order parametric pair generation.

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  • Evaluating the confinement and nonlinear interaction strengths within the designed structures.

    • Main Results:

    • Simulations predict enhanced nonlinear interactions in clad AlGaAs waveguides.
    • Demonstrated potential for second- and third-order pair generation.
    • Identified pathways to surpass current quantum optical source performance.

    Conclusions:

    • Embedding AlGaAs in dielectric cladding unlocks its full potential for strong nonlinear interactions.
    • The proposed structures could lead to advanced quantum optical devices.
    • Novel regimes of parametric photon-photon nonlinearities become accessible.