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Related Experiment Video

Updated: Jun 22, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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InP photonic wire waveguide using InAlAs oxide cladding layer.

Mitsuru Takenaka, Yoshiaki Nakano

    Optics Express
    |June 24, 2009
    PubMed
    Summary
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    We developed a new indium phosphide (InP) photonic wire waveguide with an ultrahigh index contrast, enabling tight bends with minimal loss. This innovation promises compact photonic integrated circuits with low propagation loss.

    Area of Science:

    • Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Photonic integrated circuits (PICs) require compact waveguide designs.
    • Achieving low loss in small bend radii is a key challenge for miniaturization.

    Purpose of the Study:

    • To propose and analyze a novel InP-based photonic wire waveguide.
    • To demonstrate the feasibility of ultra-high index contrast waveguides for compact PICs.

    Main Methods:

    • Numerical analysis using the three-dimensional time-domain beam propagation method (3D TD-BPM).
    • Design of a waveguide with a 500x300-nm InP core and InAlAs oxide cladding.

    Main Results:

    • The proposed waveguide exhibits an ultrahigh index contrast due to its InGaAsP/InAlAs-oxide vertical structure.

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  • A U-bend waveguide with a 3-micrometer bend radius was predicted to have propagation loss < 0.5 dB.
  • No vertical leakage loss was observed even at small bend radii.

    • Conclusions:

    • The InP photonic wire waveguide with InAlAs oxide cladding is a promising candidate for compact PICs.
    • The design enables highly efficient light confinement and low-loss bending.
    • This technology facilitates the development of next-generation optical devices.