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Schottky Barrier Diode01:27

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...

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2 × 2 single-mode zero-gap directional-coupler thermo-optic waveguide switch on glass.

C C Lee, T J Su

    Applied Optics
    |October 14, 2010
    PubMed
    Summary

    A novel thermo-optic waveguide switch demonstrates efficient light switching using the thermo-optic effect. This device shows polarization independence and temperature insensitivity, promising for future fiber-optic systems.

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    Area of Science:

    • Photonics and Optical Engineering
    • Materials Science
    • Integrated Optics

    Background:

    • Thermo-optic waveguide switches are crucial for optical communication systems.
    • Existing designs often face challenges with polarization dependence and thermal stability.
    • Efficient and stable optical switching components are needed for advanced integrated-optic systems.

    Purpose of the Study:

    • To report the fabrication and performance of a 2x2 single-mode thermo-optic waveguide switch.
    • To investigate the thermo-optic effect for light switching in a zero-gap directional coupler.
    • To validate a thermo-optic equation and thermal analysis method for predicting device performance.

    Main Methods:

    • Fabrication of a 2x2 single-mode thermo-optic waveguide switch on a glass substrate.
    • Utilizing a zero-gap directional coupler configuration with a heater electrode.
    • Employing a 0.63-µm He-Ne laser and measuring optical power for switchover.
    • Conducting transient thermal analysis using a 2D temperature solution and establishing a thermo-optic equation.

    Main Results:

    • Complete light switchover achieved at 0.25 W (quasi-steady-state) and 0.67 W (pulsed, 800 µs width).
    • Device response is independent of light polarization and insensitive to ambient temperature.
    • Calculated optical and thermal responses closely matched measured data, validating the thermo-optic equation and analysis method.

    Conclusions:

    • The developed 2x2 single-mode thermo-optic waveguide switch is a viable component for future fiber-optic and integrated-optic systems.
    • The zero-gap directional coupler principle is confirmed for efficient thermo-optic switching.
    • The thermo-optic equation and thermal analysis method provide accurate predictions of device behavior.