High harmonic generations triggered by the intense laser field in GaAs/AlxGa1-xAs honeycomb quantum well wires

Abstract

Under constant electric and magnetic fields, the potential profile of the honeycomb quantum well wire (HQWW) is studied for varying intense laser fields to trigger and optimize high harmonics (nonlinear optical rectification, second and third harmonic generation coefficients). The finite element method has been used to simulate wavefunctions and their corresponding energy levels under effective mass approximation. We have shown that an intense laser field reshapes the potential profile of the HQWW, and this results in maximum and minimum for dipole moment matrix elements and energy differences. The increase and decrease of energy differences create blue and red shifts in the optical spectrum. In the end, we have calculated nonlinear optical rectification as 11.1x10−5 m/V. The second harmonic generation coefficient is found as 18.4x10−7 m/V which is three times and a lot bigger than bulk GaAs and GaAs/AlGaAs superlattice. The third harmonic generation coefficient is calculated as 6.2x10−15 m2/V2. As a conclusion, we have shown that HQWW can be used in harmonic generation-based optical devices.