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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 >  The double resonant enhancement of optical second harmonic susceptibility in the compositionally asymmetric coupled quantum well


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/71000


    Title: The double resonant enhancement of optical second harmonic susceptibility in the compositionally asymmetric coupled quantum well
    Authors: Lien, Chenhsin;Huang, Yimin;Lei, Tan‐Fu
    教師: 連振炘
    Date: 1994
    Publisher: American Institute of Physics
    Relation: Journal of Applied Physics, American Institute of Physics, Volume 75, Issue 4, Feb 1994, Pages 2177 - 2183
    Keywords: ALAS
    TRANSITIONS
    GAAS
    2ND-HARMONIC GENERATION
    INTERSUBBAND ABSORPTION
    2ND-ORDER SUSCEPTIBILITY
    ELECTRIC-FIELD
    INFRARED PHOTODETECTORS
    Abstract: The second harmonic suceptibility due to the intersubband transitions in the three-level GaAs/AlxGa1-xAs/AlyGa1-yAs compositionally asymmetric coupled quantum well (CACQW) under the influence of the applied electric field is investigated theoretically. The subband eigenenergy E(n) of the CACQOW structure could he designed to form an equally spaced energy-level ladder. Since the eigenenergy spacing could be designed to resonate with the pumping source, the second harmonic susceptibility could be greatly enhanced through the double resonance. Based on the theoretical calculations, the second harmonic susceptibility as high as 220 nm/V can be achieved for the CACQW. This is a more than three orders of magnitude enhancement as compared to that of the bulk GaAs. In addition to the design of CACQW structure, the double resonance can also be achieved by biasing the CACQW under a proper electric field. The extinguishment of the second order nonlinear optical effect by the applied electric field has also been studied. This phenomenon is attributed to the symmetry restoration of envelope wave functions of the CACQW structures under the quenching electric field C(off). A simple physical model to estimate the C(off) has also been developed.
    Relation Link: http://www.aip.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/71000
    Appears in Collections:[電機工程學系] 期刊論文

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