Lattice mismatch, pressure and temperature effects on linear and nonlinear optical properties of InAs nanodots embedded in InAsP nanowires

Abstract

This study investigates the effects of lattice mismatch, pressure, and temperature on the linear and nonlinear optical properties of nanodots embedded within semiconductor nanowires. We present a comprehensive theoretical framework that models electron energy levels and wave functions in these nanostructures, incorporating the influence of hydrostatic pressure and temperature on critical parameters such as bandgap, effective mass, and non-parabolicity coefficient. Using the density matrix approach, we analyze three key optical phenomena: optical absorption coefficient, refractive index changes, and harmonic generation coefficients. Our calculations for ${\text{InP/InAs}}_{(1-x)}{\text{P}}_x/\text{InP}$ nanodot-nanowire systems reveal that these optical properties can be significantly modulated by varying the composition parameter x, temperature, and applied pressure. The results demonstrate pronounced resonance peaks in optical absorption and refractive index changes corresponding to intersubband transitions, with systematic shifts observed under different environmental conditions. These findings provide valuable insights for the design and optimization of nanoscale optoelectronic devices, offering pathways to tune their optical response for applications in telecommunications, optical computing, and quantum information processing.