Nonlinear optical properties of a Woods–Saxon quantum dot under an electric field

• Published in: Physica. E, Low-dimensional systems & nanostructures Low-dimensional systems & nanostructures, 2013-12, Vol.54, p.257-261
• Main Authors: Aytekin, O., Turgut, S., Üstoğlu Ünal, V., Akşahin, E., Tomak, M.
• Format: Article
• Language: English
• Subjects: Applied sciences; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Electric field; Electronics; Exact sciences and technology; Materials science; Molecular electronics, nanoelectronics; Nanocrystalline materials; Nanoscale materials and structures: fabrication and characterization; Nonlinear optic; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures; Physics; Quantum dot; Quantum dots; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Woods-Saxon
• ISSN: 1386-9477; 1873-1759
• DOI: 10.1016/j.physe.2013.06.004

A theoretical study of the effect of the confining potential on the nonlinear optical properties of two dimensional quantum dots is performed. A three-parameter Woods–Saxon potential is used within the density matrix formalism. The control of confinement by three parameters and an applied electric field gives one quite an advantage in studying their effects on the nonlinear properties. The coefficients investigated include the optical rectification, second and third-harmonic generation and the change in the refractive index. Their dependence on the electric field values, dot size and the energy of the incoming photons is studied extensively. It is shown that the Woods–Saxon potential can be used to model the confinement in quantum dots with considerable success. A three-parameter Woods–Saxon potential is used within the density matrix formalism to study the nonlinear optical properties of a two-dimensional quantum dot. [Display omitted] •Nonlinear optical properties of a Woods–Saxon quantum dot.•Effects of dot size, external electric field and photon energies are studied.•The Woods–Saxon potential is shown to model the confinement with success.