Impurity-related linear and nonlinear optical response in quantum-well wires with triangular cross section

• Published in: Journal of luminescence Vol. 143; pp. 304 - 313
• Main Authors: Duque, C.A., Mora-Ramos, M.E., Kasapoglu, E., Ungan, F., Yesilgul, U., Sakiroglu, S., Sari, H., Sökmen, I.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-11-2013; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross sections; Cross-disciplinary physics: materials science; rheology; Donor impurity; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Impurities; Materials science; Mathematical analysis; Nanoscale materials and structures: fabrication and characterization; Nonlinear optics; Nonlinearity; Optical constants: refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity; Optical materials; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Optics; Other nonlinear optical materials; photorefractive and semiconductor materials; Physics; Quantum wells; Quantum wires; Quantum-well wires; Semiconductors; Wire; Nonlinear optics; Quantum-well wires; Donor impurity; Energy levels; Semiconductor quantum wells; Refractive index; Optical properties; Optical materials; Absorption spectra; Impurity states
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2013.04.048

The 1s-like and 2p-like donor impurity energy states are studied in a semiconductor quantum wire of equilateral triangular cross section as functions of the impurity position and the geometrical size of the structure. Linear and nonlinear coefficients for the optical absorption and relative refractive index change associated with 1s→2p transitions are calculated for both the x-polarization and y-polarization of the incident light. The results show a mixed effect of redshift and blueshift depending on the location of the donor atom. Also, strong nonlinear contributions to the optical absorption coefficient are obtained for both polarizations in the on-center impurity case.
•The 1s- and 2p-like impurity states in triangular quantum-well wires.•Optical absorption and relative refractive index changes are calculated.•Redshift and blueshift in the optical structures depend on the donor position.•Strong nonlinear contributions to the absorption coefficient have been obtained.