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 language | English |
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Pages (from-to) | 1084-1088 |
Number of pages | 5 |
Journal | IEEE Journal of Quantum Electronics |
Volume | 33 |
Issue number | 7 |
DOIs | |
Publication status | Published - Jul 1997 |
Keywords
- electrooptic modulation
- n-i-n devices
- quantum wells
- quantum-confined Stark effect