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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1995),
  • paper CThI23

All-optical quantum-well-modulator device based on strong carrier separation in piezoelectric layers

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We describe a novel contact-free quantum-well (QW) light modulator. It is designed to operate all optically in the sense that an incident write laser beam strongly modulates a second read beam resonant to a QW exciton. Essential to this device is the fact that in strained semiconductor heterostructures grown along a polar axis, such as, for example, [111], the lattice-mismatch-induced strain generates a large piezoelectric field along the growth axis.1 The magnitude of the piezoelectric field can exceed 105 V/cm for rather moderate lattice-mismatch strains of ε ~ 0.7%.2

© 1995 Optical Society of America

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