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Proceedings Paper

Novel GaAs-AlAs and Si-SiGe quantum well structures with large optical nonlinearities
Author(s): Milan Jaros; M. A. Cusack; Mike J. Shaw; K. B. Wong; B. M. Adderley
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Paper Abstract

Both, GaAs-AlAs and Si-SiGe quantum well structures have been considered for applications as infrared detectors, modulators and switching devices. The miniband structure in these systems covers a wide range of energies (e.g. 1 - 400 meV) and offers an opportunity to design optical devices that would operate in the mid-to-far infrared range of wavelengths. An external field and triangular wells have been used to modify the structure of the confined states. This enhances optical nonlinearities (e.g. the second order susceptibility). In this paper we present a full scale evaluation of GaAs-AlAs and Si-SiGe quantum well structures in which the nonlinearity arises due to virtual transitions between valence minibands. We aim at structures which could operate in the 3 - 5 and 10 - 15 micrometer range. We present both the magnitude and the frequency dependence of the second order susceptibility. We show that a judicious choice of controllable material parameters such as layer width and composition can generate a strong second harmonic response in GaAs-AlAs asymmetric superlattices. Also, we report full scale calculations concerning difference-frequency generation in an asymmetric Si- SiGe quantum well structure. We find that the strongest contributions to the second order response originate from regions lying farther from the zone center.

Paper Details

Date Published: 25 August 1994
PDF: 10 pages
Proc. SPIE 2212, Linear and Nonlinear Integrated Optics, (25 August 1994); doi: 10.1117/12.185110
Show Author Affiliations
Milan Jaros, Univ. of Newcastle upon Tyne (United Kingdom)
M. A. Cusack, Univ. of Newcastle upon Tyne (United Kingdom)
Mike J. Shaw, Univ. of Newcastle upon Tyne (United Kingdom)
K. B. Wong, Univ. of Newcastle upon Tyne (United Kingdom)
B. M. Adderley, Univ. of Newcastle upon Tyne (United Kingdom)


Published in SPIE Proceedings Vol. 2212:
Linear and Nonlinear Integrated Optics

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