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Wavelength optimization of quantum-well modulators in smart pixels.

G D Boyd, L M Chirovsky, A L Lentine

    Applied Optics
    |October 22, 2010
    PubMed
    Summary

    Optimizing multiple-quantum-well modulators for smart-pixel applications reveals the ideal operating wavelength shift and number of quantum wells. Fabry-Perot resonators offer no significant improvement for these devices.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Nanotechnology

    Background:

    • Multiple-quantum-well modulators are crucial for smart-pixel applications.
    • Previous work discussed electroabsorption and refraction in these devices.

    Purpose of the Study:

    • Determine the optimum modulator design for smart-pixel applications.
    • Identify the ideal operating wavelength shift and number of quantum wells.
    • Calculate achievable reflectivity change and contrast ratio.

    Main Methods:

    • Optimization based on a figure of merit minimizing incident optical read energy.
    • Analysis of antireflection-coated devices and those with Fabry-Perot resonators.
    • Material-specific calculations for the 850-nm AlGalAs/GaAs quantum-well system.

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    Last Updated: Jun 7, 2026

    Generation and Coherent Control of Pulsed Quantum Frequency Combs
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    Main Results:

    • The optimum wavelength shift from the zero-voltage exciton is approximately 6 nm for the AlGalAs/GaAs system.
    • Fabry-Perot resonant modulators and detectors do not significantly improve the smart-pixel circuit figure of merit.
    • Reflectivity change and contrast ratio were calculated for various designs.

    Conclusions:

    • The study provides a framework for optimizing quantum-well modulators for smart-pixel applications.
    • The findings suggest that simple antireflection-coated designs are as effective as resonant structures for specific figures of merit.
    • The general approach is applicable to diverse material systems beyond AlGalAs/GaAs.