Effects of applied external fields on the nonlinear optical rectification, second, and third-harmonic generation in an asymmetrical semi exponential quantum well


SAYRAÇ M.

OPTICAL AND QUANTUM ELECTRONICS, vol.54, no.1, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 54 Issue: 1
  • Publication Date: 2022
  • Doi Number: 10.1007/s11082-021-03425-6
  • Journal Name: OPTICAL AND QUANTUM ELECTRONICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Keywords: Asymmetrical semi-exponential quantum well, Nonlinear optical rectification, Second-harmonic generation, Third-harmonic generation, Electric and magnetic field effects, Non-resonant intense laser field effect, 3RD HARMONIC-GENERATION, ELECTROMAGNETICALLY INDUCED TRANSPARENCY, REFRACTIVE-INDEX CHANGES, LASER FIELD, MAGNETIC-FIELD, INTERSUBBAND TRANSITIONS, 2ND-HARMONIC GENERATION, BINDING-ENERGY, INTENSE, POLARON
  • Sivas Cumhuriyet University Affiliated: Yes

Abstract

The asymmetric potential profiles are focus of interest for researchers who study semiconductor optoelectronic devices. Therefore, in this study, the effects of structure parameters (sigma and V-0) and applied external perturbations such as electric (F), magnetic (B), and non-resonant monochromatic intense laser field on the nonlinear optical properties of the asymmetric semi-exponential quantum well (ASEQW) are theoretically investigated. The nonlinear optical rectification (NOR), second-harmonic generation (SHG), and third harmonic generation (THG) coefficients of ASEQW structure are considered. Theoretical investigations on these optical coefficients are performed in two steps. Step 1: The energy eigenvalues and eigenfunctions of a confined single electron in the ASEQW are obtained by using the diagonalization method within the framework of the effective mass and parabolic band approaches. Step 2: The compact density matrix approximation has been used to calculate the coefficients of the nonlinear optical response in the structure. The numerical results reveal that the structural parameters and external fields change the confinement potential profile of the system, and these effects significantly affect the NOR, SHG, and THG coefficients based on intersubband (intraband or subband) transitions in a low-dimensional quantum system. As a result, the amplitude and peak position of these optical coefficients are easily controlled by the applied external fields and can be adjusted according to the purpose.