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Updated: Jun 11, 2026

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Investigation of Semiconductor Quantum Dots for Waveguide Electroabsorption Modulator.

C Y Ngo, S F Yoon, W K Loke

    Nanoscale Research Letters
    |July 3, 2010
    PubMed
    Summary

    This study explores Indium Arsenide (InAs) quantum dot (QD) electroabsorption modulators (EAMs). Results show promising performance for QD-EAMs, with potential for future improvements in optical communication technologies.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Devices
    • Nanotechnology

    Background:

    • Quantum dots (QDs) offer unique optical properties for optoelectronic devices.
    • Electroabsorption modulators (EAMs) are crucial components in optical communication systems.

    Purpose of the Study:

    • To investigate the performance of an InAs quantum dot (QD) electroabsorption modulator (EAM).
    • To evaluate the Stark shift and absorption characteristics of the QD-EAM structure.

    Main Methods:

    • Fabrication of a p-i-n ridge waveguide structure utilizing a 10-layer InAs QD active region.
    • Photocurrent and optical transmission measurements were performed under varying reverse bias conditions.

    Main Results:

    • A Stark shift of approximately 5 meV (~7 nm) was observed at 3 V reverse bias (75 kV/cm).

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  • Broadening of the resonance peak due to field ionization occurred at electric fields above 25 kV/cm.
  • Maximum absorption change was identified at 1317 nm, with an insertion loss of ~8 dB and extinction ratio of ~5 dB at 5 V reverse bias.

    • Conclusions:

    • InAs quantum dots show significant potential as the active region for EAMs.
    • Further research efforts are expected to enhance the performance of QD-EAMs for optical applications.