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    National Tsing Hua University Institutional Repository > 電機資訊學院 > 電機工程學系 > 期刊論文 >  Electric Field Enhancement and Extinguishment of Optical Second Harmonic Generation in Asymmetric Coupled Quantum Wells


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/71030


    Title: Electric Field Enhancement and Extinguishment of Optical Second Harmonic Generation in Asymmetric Coupled Quantum Wells
    Authors: Yimin Huang;Chunfu Wang;Chenhsin Lien
    教師: 連振炘
    Date: 1995
    Publisher: Institute of Electrical and Electronics Engineers
    Relation: Quantum Electronics, IEEE Journal of, Institute of Electrical and Electronics Engineers, Volume 31, Issue 10, Oct. 1995, Pages 1717 - 1725
    Keywords: 2ND-HARMONIC GENERATION
    2ND-ORDER SUSCEPTIBILITY
    MU-M
    INFRARED PHOTODETECTORS
    INTERSUBBAND ABSORPTION
    HETEROSTRUCTURES
    NONLINEARITIES
    RECTIFICATION
    SUPERLATTICES
    DETECTOR
    Abstract: The second-harmonic susceptibilities of asymmetric coupled quantum wells (ACQW) and compositionally asymmetric coupled quantum wells (CACQW) under the influence of the applied electric field are investigated theoretically. Analytic forms of the second-harmonic susceptibility are derived by using the density matrix formalism. Coupled one-dimensional Schrodinger equation and Poisson's equation ae solved self-consistently to find the subband eigenenergies and the envelope wavefunctions for the ACQW and CACQW structures. Dipole moment matrix elements for the ACQW and CACQW are evaluated from the resulting envelope wavefunctions and large nonlinear optical effects are predicted for these two structures. Based on the theoretical calculations, the second-harmonic susceptibilities of 50 nm/V and 35 nm/V can be achieved for the ACQW and the CACQW, respectively. This is more than two orders of magnitude enhancement as compared to that of the bulk GaAs. By a suitable choice of the composition of CACQW, a novel structure which the second-order nonlinear optical effect can be turned on or off by the applied electric field is proposed based on the results of the theoretical calculation. This phenomenon is attributed to the symmetry restoration of envelope wavefunctions of the CACQW under the quenching electric field F-off. A simple physical model to estimate the F-off has also been developed successfully.
    Relation Link: http://www.ieee.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/71030
    Appears in Collections:[電機工程學系] 期刊論文

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