Abstract
In this work, the effects of size, and temperature on the linear
and nonlinear optical properties in InGaN/GaN inverse parabolic
and triangular quantum wells (IPQW and ITQW) for different
concentrations at the well center were theoretically investigated.
The indium concentrations at the barriers were fixed to be always
xmax = 0.2. The energy levels and their associated wave functions
are computed within the effective mass approximation. The
expressions of optical properties are obtained analytically by using
the compact density-matrix approach. The linear, nonlinear, and
total absorption coefficients depending on the In concentrations at
the well center are investigated as a function of the incident photon
energy for different values of temperature and quantum wells size.
The results show that the In concentrations, size and temperature
have a significant effect on these optical properties. The positions
of the resonance peaks of the absorption coefficients were blueshifted under increasing indium compositions in the quantum wells
(InGaN) and temperature while they were red-shifted with the
increase in the thickness of the wells. Moreover, the amplitudes of
the resonance peaks were enhanced under the increase of the In
composition, the temperature, and the thickness of the quantum
wells. The optical absorption in ITQW structure is slightly greater
than that in IPQW one.
and nonlinear optical properties in InGaN/GaN inverse parabolic
and triangular quantum wells (IPQW and ITQW) for different
concentrations at the well center were theoretically investigated.
The indium concentrations at the barriers were fixed to be always
xmax = 0.2. The energy levels and their associated wave functions
are computed within the effective mass approximation. The
expressions of optical properties are obtained analytically by using
the compact density-matrix approach. The linear, nonlinear, and
total absorption coefficients depending on the In concentrations at
the well center are investigated as a function of the incident photon
energy for different values of temperature and quantum wells size.
The results show that the In concentrations, size and temperature
have a significant effect on these optical properties. The positions
of the resonance peaks of the absorption coefficients were blueshifted under increasing indium compositions in the quantum wells
(InGaN) and temperature while they were red-shifted with the
increase in the thickness of the wells. Moreover, the amplitudes of
the resonance peaks were enhanced under the increase of the In
composition, the temperature, and the thickness of the quantum
wells. The optical absorption in ITQW structure is slightly greater
than that in IPQW one.
Keywords
In-compositions
Intrasubband transitions
Inverse parabolic QW
Inverse triangular QW
Optical Properties