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Related Concept Videos

Biasing of Metal-Semiconductor Junctions01:27

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Compact polarization splitter based on silicon grating-assisted couplers.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Waveguide Devices

    Background:

    • Polarization beam splitters (PBS) are crucial optical components.
    • Existing PBS designs often face limitations in size, bandwidth, or fabrication tolerance.
    • Developing compact and efficient PBS is essential for integrated optics.

    Purpose of the Study:

    • To propose a novel compact polarization beam splitter (PBS).
    • To utilize contra-directional coupling in grating-assisted couplers for enhanced performance.
    • To achieve suppressed co-directional coupling and broad working bandwidth.

    Main Methods:

    • Designing a device based on contra-directional coupling between two corrugated strip waveguides.
    • Employing an asymmetric structure to suppress co-directional coupling.
    • Utilizing a spatially periodic refractive-index perturbation for phase matching at 1550 nm.

    Main Results:

    • Achieved suppressed co-directional coupling through asymmetric structure design.
    • Demonstrated phase matching for TE polarization at 1550 nm.
    • Obtained a broad working bandwidth of approximately 40 nm with crosstalk below -12 dB.
    • Showcased a compact device with a coupling length of only 19 μm.
    • Confirmed a large fabrication tolerance of ±40 nm for waveguide width.

    Conclusions:

    • The proposed grating-assisted coupler-based PBS offers a compact and efficient solution.
    • The contra-directional coupling approach overcomes limitations in precise control of coupling strength and length.
    • The device exhibits excellent performance characteristics, including broad bandwidth and high fabrication tolerance, making it suitable for integrated photonic applications.