Intersubband optical absorption coefficients and refractive index changes in modulation-doped asymmetric double quantum well


Ungan F. , Kasapoglu E. , Sokmen I.

SOLID STATE COMMUNICATIONS, cilt.151, ss.1415-1419, 2011 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 151 Konu: 20
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.ssc.2011.07.011
  • Dergi Adı: SOLID STATE COMMUNICATIONS
  • Sayfa Sayıları: ss.1415-1419

Özet

The linear and the third-order nonlinear optical absorption coefficients and refractive index changes in a modulation-doped asymmetric double quantum well are studied theoretically. The electron energy levels and the envelope wave functions in this structure are calculated by the Schrodinger and Poisson equations self-consistently in the effective mass approximation. The analytical expressions of optical properties are obtained by using the compact density-matrix approach. In this regard, the linear, nonlinear and total intersubband absorption coefficients and refractive index changes are investigated as a function of right-well width (Lw(2)) of asymmetric double quantum well. Our results show that the total absorption coefficients and refractive index changes shift toward higher energies as the right-well width decreases. In addition, the total optical absorption coefficients and refractive index changes is strongly dependent on the incident optical intensity. (C) 2011 Elsevier Ltd. All rights reserved.