广州大学学报（自然科学版）
廣州大學學報（自然科學版）
엄주대학학보（자연과학판）
JOURNAL OF GUANGZHOU UNIVERSITY(NATURAL SCIENCE EDITION)
2011年
1期
19-25
,共7页
光学克尔效应%非对称耦合量子阱%量子约束效应
光學剋爾效應%非對稱耦閤量子阱%量子約束效應
광학극이효응%비대칭우합양자정%양자약속효응
optical Kerr effect%asymmetric coupled quantum wells%quantum confinement effect
详细研究了GaAs/AlxCa1-xAs非对称耦合量子阱的光学克尔效应,并利用紧束缚密度矩阵方法及迭代法导出了光学克尔效应的解析表达式.数值结果表明,入射光强、弛豫率和结构参数(如势垒宽度和右阱宽度)对光学克尔效应有明显的影响;通过优化入射光强、弛豫率和结构参数,可以获得比量子盘模型的克尔系数大四个数量级的克尔系数,其显著增强的主要原因是极大的偶极跃迁矩阵元和三阶共振条件.
詳細研究瞭GaAs/AlxCa1-xAs非對稱耦閤量子阱的光學剋爾效應,併利用緊束縳密度矩陣方法及迭代法導齣瞭光學剋爾效應的解析錶達式.數值結果錶明,入射光彊、弛豫率和結構參數(如勢壘寬度和右阱寬度)對光學剋爾效應有明顯的影響;通過優化入射光彊、弛豫率和結構參數,可以穫得比量子盤模型的剋爾繫數大四箇數量級的剋爾繫數,其顯著增彊的主要原因是極大的偶極躍遷矩陣元和三階共振條件.
상세연구료GaAs/AlxCa1-xAs비대칭우합양자정적광학극이효응,병이용긴속박밀도구진방법급질대법도출료광학극이효응적해석표체식.수치결과표명,입사광강、이예솔화결구삼수(여세루관도화우정관도)대광학극이효응유명현적영향;통과우화입사광강、이예솔화결구삼수,가이획득비양자반모형적극이계수대사개수량급적극이계수,기현저증강적주요원인시겁대적우겁약천구진원화삼계공진조건.
The optical Kerr effect (OKE) in GaAs/AlxGa1-xAs asymmetric coupled quantum wells(ACQWs) is studied in detail. An analytic formula for the OKE in the model is obtained by a compact density matrix approach and an iterative procedure. Finally, the calculated results show the incident optical intensity,the relaxation rate and the structure parameters such as the barrier width and the right-well width have a great influence on obtained by optimizing the incident optical intensity, the relaxation rate and the structure parameters, which is over four orders of magnitude greater than in quantum disk model. The contributors to the very giant OKE include the very large dipole transition matrixes and the triple resonant condition.
