Linear and nonlinear optical properties of asymmetric triple quantum wells under intense laser field

Abstract

For asymmetric triple quantum wells (ATQW) the linear and nonlinear optical absorption coefficient (OAC) and the optical refractive index change (ORIC) are analyzed according to the intense laser field (ILF). The obtained results show that the ILF parameter (α 0 ) has an important effect on the shape and height of the confined potential profile of the ATQW, and alterations in the energy levels and the dipole moment matrix elements depend on the shape of the confinement potential. For α 0 = 10 nm (according to the parameters used in this study), ATQW turns into an asymmetric wider double confinement potential. As a consequence of the energy difference between the energy states, the absorption spectrum of (1-2) and (1-3) optical transitions initially shows a redshift (up to α 0 = 6 nm and α 0 = 4 nm, respectively) and then indicates a blueshift by increasing the ILF. For the (2-3) transition, the optical absorption spectrum continuously shows a blueshift and displays an oncoming shift toward the higher energies. Thus, the linear and nonlinear OAC and ORIC may be adjusted by modifying the ILF parameter. Our results are of use in the investigation into new ways of manipulating the optoelectronic properties of triple quantum well devices. Highlights• The electronic and optical properties of ATQW vary with increasing ILF value.• The effect of ILF on the quantum well (QW) differs depending on the shape of the QW.• OAC and ORIC change with rising ILF.• The absorption spectrum shows blueshifts or redshifts depending on the ILF.

Intense laser field effect on the nonlinear optical properties of triple quantum wells consisting of parabolic and inverse-parabolic quantum wells

“…where α 0 = e 2 8πI laser m * 2 cΩ 4 is the laser-dressing parameter [26,35], I laser is the mean intensity of the laser, c is the light velocity, and Ω is the laser frequency.…”

“…The intense laser field (ILF) effects on the confinement potential and the corresponding energy levels play a vital role in optoelectronic device demonstrating. The influence of ILF with high-frequency also causes significant changes in the form of the confinement quantum well potential [22][23][24][25][26], and transition from the single quantum well potential to double quantum well potential can be achieved by the ILF effect [23]. As the potential profile of the system is strongly tuned with the ILF parameter (α 0 ), the optical characteristics, as well as energy states change significantly.…”

Depending on the intense laser field of the nonlinear optical rectification, second and third harmonic generation in asymmetric parabolic-step and inverse parabolic-step quantum wells

“…When the confined potential of the system is importantly improved, the optical characteristics as well as bound state ELs are significantly affected. The high frequency ILF effect can cause large variations in the confined potential of QW constructions [22,[24][25][26][27]. Their consequences display that rapid estimation of excited levels for GaAs/GaAlAs QWs with increased ILF values indicates the possibility of increased population inversion to the optical pumping scheme, which is attractive for the project of powerful QW lasers.…”

“…The laser-dressed potentials are offered by [35]: * is the laser-dressing parameter [27,28,37], I laser is the mean intensity of the laser, W is the laser frequency and c is the light velocity.…”