Electron-related nonlinear optical properties of cylindrical quantum dot with the Rosen–Morse axial potential

Abstract

We present a theoretical study on the effects of intense laser field (ILF) and static electric field on the linear and nonlinear optical properties of a cylindrical quantum dot with Rosen–Morse axial potential under the framework of effective mass and parabolic band approximations. This study also takes into account the effects of the structure parameters (η, V1, and R). The analytical expressions of the linear, third-order nonlinear and total optical absorption coefficients (TOACs) and the relative refractive index changes (RRICs) are obtained by using the compact-density-matrix approach. The results of numerical calculations show that the resonant peak position of the TOACs and RRICs shifts towards lower energies and the magnitude of the peak increases with the effect of the static electric field and ILF. In addition, it is observed that while the resonant energies of the TOACs and RRICs of system shift towards the higher (lower) energies with the enhancement of η, V1, they decrease with the augmentation of R. Thus, the findings of this study show that the optical properties of the structure can be adjusted by changing the magnitude of structure parameters and applied external fields.

Effects of an External Magnetic Field on the Interband and Intraband Optical Properties of an Asymmetric Biconvex Lens-Shaped Quantum Dot

“…For the spectral dependences of the linear and nonlinear coefficients for different magnetic fields and lens-shaped QD heights on the photon energy, when incident optical intensity is = 1 kW/cm 2 and electron density in QD = 3·10 16 cm − 3 [ 44 , 45 ], the nonlinear absorption has the opposite sign to the linear one. Calculations were for 300 K. First of all, it should be mentioned that the nonlinear absorption value decreases, but the nonlinear practically does not change (see Figure 7 and Figure 8 ).…”

Yarıiletken Silindirik Kuantum Noktanın Optik Özellikleri

“…Diğer bir çalışmada Ungan vd. [14] elektronik seviyeler arası optik geçişleri için silindirik kuantum noktanın optik özellikleri elektrik alan ve silindirin boyut parametrelerine göre değişimi incelenmiştir. Makalede yazarlar, soğurma katsayısının maksimumu elektrik alanın artmasıyla, düşmesi ve gelen foton enerjisine göre sağa kaymasını gözlemlemişler.…”