Al Composition Dependence of the Optical Gain Characteristics of a-plane Al-rich AlGaN/AlN Quantum-well Structures

Al Composition Dependence of the Optical Gain Characteristics of a-plane Al-rich AlGaN/AlN Quantum-well Structures

The Al composition dependence of the optical gain characteristics of a-plane Al-rich AlGaN/AlN quantum-well (QW) structures was investigated using the multiband effective-mass theory and the non-Markovian optical model with the many-body effect. quantum-well (QW) structures were investigated using the multiband effective-mass theory and non-Markovian optical model with the many-body effect. The optical gain for the x′-polarization is shown to be much larger than that for the y′-polarization because the optical matrix element for the x′-polarization is larger than that for the y′-polarization. The optical gain for the x′-polarization gradually decreases with increasing Al composition. In the case of the c-plane, the intensity of the optical gain increases with increasing Al composition because of the reduction in the internal field. However, the optical gain is shown to decrease rapidly with increasing Al composition when the Al composition exceeds 0.75.

The Al composition dependence of the optical gain characteristics of a-plane Al-rich AlGaN/AlN quantum-well (QW) structures was investigated using the multiband effective-mass theory and the non-Markovian optical model with the many-body effect. quantum-well (QW) structures were investigated using the multiband effective-mass theory and non-Markovian optical model with the many-body effect. The optical gain for the x′-polarization is shown to be much larger than that for the y′-polarization because the optical matrix element for the x′-polarization is larger than that for the y′-polarization. The optical gain for the x′-polarization gradually decreases with increasing Al composition. In the case of the c-plane, the intensity of the optical gain increases with increasing Al composition because of the reduction in the internal field. However, the optical gain is shown to decrease rapidly with increasing Al composition when the Al composition exceeds 0.75.