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

Abstract

The nonlinear optical rectification (NOR), the second harmonic generation (SHG) and the third harmonic generation (THG) coefficients in asymmetric parabolic-step quantum wells (APSQW) and asymmetric inverse parabolic-step quantum wells (AIPSQW) are considered as depending on the intense laser field (ILF). The found consequences indicate that ILF parameter approves a dynamic influence on the shape, width and height of the confined potential profile of both APSQW and AIPSQW, and the alterations of the dipole moment matrix elements and the energy levels (ELs) are followed on the profile of the confined potential. The potential profile and height of the AIPSQW compared to APSQW were affected differently from ILF intensity. With and without the ILF, the ELs in the APSQW are smaller than in the AIPSQW. These results designate that NOR, SHG, and THG coefficient of APSQW and AIPSQW may be controlled in a chosen energy range and the magnitude of the resonance peak (RP) by increasing ILF value. By modifying the ILF parameter, it is possible to classify red or blue shifts at the RP positions of the NOR, SHG and THG coefficients. We hope that our results will offer significant development of optical devices in many potential device applications for the appropriate selection of ILF values.

Nonlinear Optical Second Harmonic Generation Characteristics in Cylindrical GaAs/Ga1–ηAlηAs Quantum Dots

“…These studies delve into the mechanism by which constraint potentials affect the optical response of confined quantum structures, revealing their potential role and significance in practical applications. [38][39][40][41][42][43] However, most of these studies have focused on exploring the nonlinear optics of quantum systems under confinement potentials and external fields in a spherical coordinate system. In contrast to these, our article systematically studies the second harmonic generation (SHG) in cylindrical GaAs/Ga 1-η Al η As quantum dots under the effects of like-inversely quadratic Hellmann potential in the radial direction and the semi-parabolic potential in the axial direction.…”

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

“…The parabolic quantum wells are also used to reflect infrared detectors with low leakage current [3] and are used in resonance tunneling devices for potential claims in high-speed circuits [4]. Theoretical and experimental research on the influences of magnetic, electric, and laser fields and the hydrostatic pressure in the parabolic quantum wells [5][6][7][8][9][10][11][12][13] and the inverse parabolic quantum wells [12][13][14][15] have also been the topic of attention in most investigates.…”

Optimization of terahertz absorption in periodic quantum well structures

“…Today's, the semiconductor quantum structures including quantum wells, quantum wires, quantum dots, quantum emitters and super-lattices, due to their unique properties are the subject of many research [1][2][3][4][5][6]. The optical and electronic properties of these structures are of great interest due to their extensive functional capabilities in semiconductor optoelectronic devices, such as Infrared lasers, far-infrared photo-detectors, electro-optical modulators, and optical switches [7][8][9].In addition, due to the widespread use of semiconductor quantum wells (QWs) in the fabrication a hosseini@sutech.ac.ir of electronic devices, optoelectronics, semiconductor lasers, infrared detectors, the study of the external factors on the optical properties of QWs systems is important [7][8][9].…”