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    We developed subwavelength gratings for integrated waveguides to reduce light reflection. This technique significantly improves anti-reflection properties for photonic devices.

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    Area of Science:

    • Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Integrated photonics requires efficient light coupling and minimal signal loss.
    • Facet reflections in waveguides can degrade device performance and limit applications.

    Purpose of the Study:

    • To demonstrate anti-reflection properties of subwavelength gratings on InP membrane-on-silicon waveguides.
    • To achieve low-loss optical interfaces for integrated photonic circuits.

    Main Methods:

    • Fabrication of subwavelength gratings using lithography on InP membrane-on-silicon waveguides.
    • 3D finite-difference time-domain (FDTD) simulations to model optical performance.
    • Characterization using Mach-Zehnder interferometers to measure reflection losses.

    Main Results:

    • Simulations predicted reflections below -30 dB for TE and TM polarized modes at 1550 nm.
    • Experimental results showed relative reflections as low as -25 dB.
    • The gradient index effect of gratings enables a smooth transition between core material and air.

    Conclusions:

    • Subwavelength gratings are an effective technique for reducing facet reflections in integrated waveguides.
    • This method enhances the performance of photonic integrated circuits.
    • The InP membrane-on-silicon platform is suitable for implementing these anti-reflection structures.