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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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HWCVD a-Si:H interlayer slope waveguide coupler for multilayer silicon photonics platform.

Rafidah Petra, Swe Zin Oo, Antulio Tarazona

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    This summary is machine-generated.

    We developed new interlayer slope waveguides for multi-layer silicon photonics. These waveguides efficiently guide light between levels with a measured loss of 0.17 dB/slope.

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    Area of Science:

    • Photonics
    • Materials Science
    • Integrated Optics

    Background:

    • Multi-layer silicon photonics platforms require efficient methods for vertical light routing.
    • Existing solutions may face challenges with integration density and signal loss.

    Purpose of the Study:

    • To design and demonstrate a novel interlayer slope waveguide for efficient light transfer between layers in silicon photonics.
    • To characterize the optical performance of these waveguides.

    Main Methods:

    • Fabrication of hydrogenated amorphous silicon (a-Si:H) waveguides using hot-wire chemical vapor deposition (HWCVD) at 230°C.
    • Design of waveguides with a sloped section connecting input and output layers, featuring vertical separation for isolation.
    • Optical loss measurements at 1550 nm for the transverse electric (TE) mode.

    Main Results:

    • Achieved a low measured loss of 0.17 dB/slope.
    • Waveguide dimensions optimized to 600 nm width (w) and 400 nm core thickness (h).
    • Demonstrated effective light guiding between separated layers.

    Conclusions:

    • Interlayer slope waveguides offer a viable solution for vertical light routing in multi-layer silicon photonics.
    • The HWCVD fabrication method provides a low-loss pathway for integrated optical circuits.
    • This technology enables improved device density and performance in silicon photonics.