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    National Tsing Hua University Institutional Repository > 電機資訊學院 > 電機工程學系 > 會議論文  >  Optical Second Harmonic Susceptibility in Compositionally Asymmetric Coupled Quantum Well

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/69083

    Title: Optical Second Harmonic Susceptibility in Compositionally Asymmetric Coupled Quantum Well
    Authors: Yimin Huang;Chenhsin Lien;Tan-Fu Lei
    教師: 連振炘
    Date: 1993
    Publisher: Institute of Electrical and Electronics Engineers
    Relation: Proceedings of 1993 ROC Electron Devices and Materials Symposium Chungli, Taiwan, ROC, Oct 1993, Pages 414-417
    Keywords: Second Harmonic Sensitivity
    Asymmetric Coupled Quantum Well
    Dipole Moment
    Nonlinear Optical Effect
    Electric Field
    Abstract: The second harmonic susceptibility X/sup (2)/ (2.omega.) of a compositionally asymmetric coupled quantum well (CACQW) under the influence of the applied electric field are investigated theoretically. Analytical forms of the second harmonic susceptibility are derived by using the density matrix formalism. Coupled one-dimensional Schrodinger equation and Poisson equation are solved self- consisted to find subband eigenenergies and the envelope wave functions of the CACQW. Dipole moment elements for the CACQW are evaluated from the resulting envelope wave function and large nonlinear optical effects are predicated for this structure. By a suitable choice of the composition of CACQW, a novel structure which the second order nonlinear optical effect can be turn on or off by the applied electric field is proposed base on the results of the theoretical calculation. This phenomenon is attributed to the symmetry restoration of envelope wave functions of the CACQW under the quenching electric field. A simple physical model to estimate the quenching electric field has also been developed successfully.
    Relation Link: http://www.ieee.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/69083
    Appears in Collections:[電機工程學系] 會議論文

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