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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1995),
  • paper CThQ5

Infrared electro-optical modulators employing intervalley transfer in asymmetric double quantum wells

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Abstract

The development of electro-optical (EO) modulators, filters, and switches for the mid-wave and long-wave infrared (MWIR and LWIR) spectral regions currently remains at a rather primitive stage in comparison to the near-IR modulators now being intensively developed for fiber-optic communications, optoelectronic interconnects, and other large-volume applications. Here we propose a highly flexible asymmetric double-quantum-well (ADQW) design employing intersubband interactions either at normal incidence or in a waveguide-mode geometry. The device operation is based on an electrically controlled real-space and momentum-space transfer of electrons between a quantum well whose conduction-band minimum is at the Γ-point and a second well whose minimum is at the L-point. We predict MWIR and LWIR EO coefficients and device figures of merit comparable to those associated with the excitonic quantum-confined Stark effect (QCSE) used in interband modulators operating at shorter wavelengths.

© 1995 Optical Society of America

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