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Photorefractive multiple quantum wells at 1064 nm.

S Iwamoto, S Taketomi, H Kageshima

    Optics Letters
    |November 23, 2007
    PubMed
    Summary
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    Researchers created novel photorefractive Indium Gallium Arsenide/Gallium Arsenide (InGaAs/GaAs) multiple quantum wells. These advanced semiconductor materials exhibit sensitivity near 1.06 µm wavelengths, a significant development for optoelectronics.

    Area of Science:

    • Semiconductor Physics
    • Optoelectronics
    • Materials Science

    Background:

    • Photorefractive materials are crucial for optical signal processing and data storage.
    • Existing materials often have limitations in sensitivity or operating wavelength.
    • Multiple quantum wells offer tunable optoelectronic properties.

    Purpose of the Study:

    • To fabricate and characterize novel photorefractive Indium Gallium Arsenide/Gallium Arsenide (InGaAs/GaAs) multiple quantum wells.
    • To investigate their photosensitivity at near-infrared wavelengths, specifically around 1.06 µm.
    • To establish a new material system for advanced photonic applications.

    Main Methods:

    • Fabrication of InGaAs/GaAs multiple quantum well structures.
    • Measurement of photorefractive properties using four-wave-mixing (FWM).

    Related Experiment Videos

  • Utilized a Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) laser for excitation and probing.

    • Main Results:

    • Successfully fabricated InGaAs/GaAs multiple quantum wells exhibiting photorefractive effects.
    • Achieved sensitivity at wavelengths near 1.06 µm, a first for this material system.
    • Measured a maximum diffraction efficiency of 7 x 10⁻⁴.
    • Determined a cutoff grating period of approximately 2 µm.

    Conclusions:

    • The developed InGaAs/GaAs multiple quantum wells represent a significant advancement in photorefractive materials.
    • These materials demonstrate promising performance for applications requiring sensitivity at 1.06 µm.
    • Further research can explore optimization for enhanced diffraction efficiency and broader wavelength response.