Rui-Zhen Wang

Publications (3)4.03 Total impact

• Article: Second-order nonlinear optical susceptibilities in asymmetric coupled quantum wells

  Bin Chen, Kang-Xian Guo, Zuo-Lian Liu, Rui-Zhen Wang, Yun-Bao Zheng, Bin Li
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  ABSTRACT: The second harmonic generation (SHG) in the asymmetric coupled quantum wells (ACQWs) is studied theoretically for different widths of the right-well and the barrier. The analytical expression of the SHG susceptibility is deduced by using the compact density matrix approach and the iterative method. Numerical calculations are presented for typical GaAs/AlxGa1−xAs ACQWs. The results show that the calculated SHG susceptibility in this coupled system can reach a magnitude of 10−5 m V−1, 1–2 orders higher than that in single quantum systems. Moreover, the SHG susceptibilities are not monotonic functions of the widths of the right-well and the barrier, but have complex relationships with them. The calculated results also reveal that by adjusting the widths of the right-well and the barrier respectively, a set of optimal structural parameters can be found for obtaining a strong SHG susceptibility.
  Journal of Physics Condensed Matter 05/2008; 20(25):255214. · 2.55 Impact Factor
• Article: Nonlinear optical rectification in asymmetric coupled quantum wells

  Rui-Zhen Wang, Kang-Xian Guo, Zuo-Lian Liu, Bin Chen, Yun-Bao Zheng
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  ABSTRACT: The optical rectification (OR) in the asymmetric coupled quantum wells (ACQWs) is calculated theoretically. The dependence of the OR on the width of the right-well and the barrier is studied. The analytical expression of the optical rectification coefficient is obtained by using the compact density-matrix approach and the iterative method, and the numerical calculations are presented for a typical GaAs/AlxGa1 − xAs ACQW. The results obtained show that the OR efficient can reach the magnitude of 10−4 m/V in this ACQW system, which is 1–2 orders higher than that in single quantum systems. Moreover, the OR coefficient is strongly dependent on the widths of the barrier and the right-well of the ACQWs. An appropriate choice for the width of the barrier and the right-well of the ACQWs can induce a larger OR coefficient.
  Physics Letters A. 373(7):795-798.
• Article: Third-harmonic generation in cubical quantum dots

  Zhi-Hai Zhang, Kang-Xian Guo, Bin Chen, Rui-Zhen Wang, Min-Wu Kang
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  ABSTRACT: Third-harmonic generation (THG) for cubical quantum dots (CQDs) with an applied electric field is theoretically investigated in the framework of the compact-density-matrix approach and an iterative method. The confined wave functions and energies of electrons in the CQDs are calculated in the effective-mass approximation. Numerical calculations are presented for typical GaAs/AlAs CQDs. The results demonstrate that the THG strongly depends on the length of the CQDs and the magnitude of the electric field. Also, the peaks shift towards the higher energy region with increasing electric field.
  Superlattices and Microstructures 46(4):672-678. · 1.49 Impact Factor