Operation and theoretical analysis of the multiple asymmetric coupled quantum-well light modulator in the n-i-n configuration

Ewa M. Goldys*, Graeme Nott, Trevor L. Tansley, M. Henini, M. A. Pate, G. Hill

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    Results of optical measurements on a multiple asymmetric quantum-well device in the n-i-n configuration that demonstrate for the first time its applicability as a light modulator are presented. The contrast ratio at the fundamental heavy hole exciton resonance is close to 2 for small operating voltage of around 3.5 V. Dual wavelength operation was proved possible with a weaker contrast ratio at 1.68 eV. The energy levels and the absorption coefficient are calculated in the envelope function approximation within the eight-band k x p model with electric field-dependent transition energies in agreement with theory. Weak deviations from the step-like character of the calculated absorption spectrum are explained by the wave vector dependence of the optical matrix element.

    Original languageEnglish
    Pages (from-to)1084-1088
    Number of pages5
    JournalIEEE Journal of Quantum Electronics
    Volume33
    Issue number7
    DOIs
    Publication statusPublished - Jul 1997

    Keywords

    • electrooptic modulation
    • n-i-n devices
    • quantum wells
    • quantum-confined Stark effect

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