二阶非线性光学效应是非线性光学中人们发现最早,研究最多,应用最广的一个课题.在非对称性势阱中,二次谐波产生系数与势阱的形状及其非对称性程度有很大的关系.本文用量子力学中密度矩阵算符理论导出了P(o)schl-Teller势阱中二次谐波产生系数和解析表达式.考虑到在P(o)schl-Teller势阱中有两个可调参数κ和λ,并且势阱的形状与对称性随κ和λ取值的不同而明显不同,因此我们可以通过调节κ和λ的取值而获得P(o)schl-Teller势阱中的二次谐波产生系数的变化规律,并找到其最大值,从而为实验提供必要的研究方向与理论依据.
Nonlinear optics of low-dimensional semiconductor structures has recently attracted considerable attention. The problem is very important to the development of superlattice devices such as fast infrared detectors and modulators because one needs to know the range of input optical intensities for which linear operation is possible. Analytical expression of the second-harmonic generation (SHG) coefficients is obtained in the Poschl-Teller well using the density matrix formalism taking into account the intrasubband relaxation. Since there are two adjustable parameters κ and λ in the Poschl-Teller well, the shape of the well will change with the change of the parameters κ and λ, accordingly the SHG coeffcient will change with the parameters κ and λ. It is shown that the SHG coefficient depends on the parameter κ、λ and the tunnel bandwith. Numerical results are presented for a typical AlGaAs/GaAs Poschl-Teller well.
参考文献
| [1] | Atanasov R, Bassani F. Second-order optical susceptibility of asymmetric quantum wells [J]. Phys. Rev. B, 1994,50(11): 7809-7819 |
| [2] | Girndt A, Koch S W, Chow W W. Microscopic theory of laser gain in semiconductor quantum wells [J]. Appl.Phys. A, 1998, 66(4): 1-4 |
| [3] | Herbert L E, Weiss B L. The optical properties of hyperbolic quantum-well strcture [J]. J. Appl. Phys., 1991,70(2): 1054-1058 |
| [4] | Gurnick M K, DeTemple T A. Synthetic nonlinear semiconductor [J]. IEEE. J. Quant. Electron., 1983, QE-19:791-794 |
| [5] | Khurhgin J. Second-order susceptibility of asymmetric coupled quantum well [J]. Appl. Phys. Lett., 1987, 51(25):2100-2102 |
| [6] | Xie Y, Chen Z, Cui D. Optical second-order susceptibility of GaAs/AlxGa1_x As asymmetric coupled quantum well structure in the exciton region [J]. Phys. Rev. B, 1991, 43(24): 12477-12451 |
| [7] | Harshman P, Wang S. Second-order susceptibility of asymmetric coupled quantum well [J]. Appl. Phys. Lett.,1992, 60(5): 1277-1282 |
| [8] | Scandolo S, Baldereschi A, Capasso F. Optical transition in a step quantum well [J]. Appl. Phys. Lett., 1993, 62:3138-3142 |
| [9] | Rosencher E, Bois P. Model system for optical nonlinearities [J]. Appl. Phys. Lett., 1991, 44(20): 11315-11327 |
| [10] | Guo Kanxian, Chen Chuanyu. Electro-optic effects in electric-field-biased parabolic quantum wells [J]. Acta Photonica Sinica(光子学报),1998, 27(6): 494-498 (in Chinese) |
| [11] | Tan Peng, Guo Kangxian, Chen Chuanyu. Optical recitification in the Poschl-Teller well [J]. Acta Photonica Sinica (光子学报), 2001, 30(2): 170-173 (in Chinese) |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%