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AlGaAs/GaAs optically controlled wave-plate modulator.

R T Sahara, W H Steier, S G Hummel

    Optics Letters
    |September 29, 2009
    PubMed
    Summary
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    We developed an optically controlled electro-optic modulator using AlGaAs/GaAs quantum wells. This device functions as a high-contrast optical switch with a fast switching speed, demonstrating potential for integrated optics applications.

    Area of Science:

    • Optoelectronics
    • Materials Science
    • Integrated Optics

    Background:

    • Semiconductor quantum wells offer unique optoelectronic properties.
    • Integrated optics requires efficient and fast optical modulation.
    • AlGaAs/GaAs heterostructures are suitable for optoelectronic devices.

    Purpose of the Study:

    • To demonstrate an optically controlled electro-optic wave-plate modulator.
    • To evaluate its performance as an optical switch and wave plate.
    • To characterize its electro-optic coefficients and photo-generated current sensitivity.

    Main Methods:

    • Fabrication of an AlGaAs/GaAs multiple-quantum-well device.
    • Integration of optical waveguides for signal and control beams.
    • Measurement of optical switching contrast ratios and throughput.

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  • Characterization of electro-optic coefficients and current sensitivity.

    • Main Results:

    • Achieved output amplitude contrast ratios greater than 300:1 for optical switching.
    • Obtained signal beam throughputs of 34%.
    • Extrapolated a switching speed of 1.5 ns.
    • Measured linear and quadratic electro-optic coefficients and photo-generated current sensitivity.

    Conclusions:

    • The AlGaAs/GaAs quantum well modulator shows promise for integrated optics.
    • High contrast ratios and fast switching speeds are achievable.
    • The device can function as both an optical switch and an optically controlled wave plate.