Polarization anisotropy of photoluminescence spectra in gallium arsenide under different surface waves

We have studied the dynamic polarization anisotropy of photoluminescence spectra in gallium arsenide under different surface waves configurations by applying microscopic photoluminescence setup. We have found a periodic emission energy oscillation due to the strain induced band gap modulation. Time related polarization anisotropy spectra obtained under the one dimensional standing surface acoustic waves revealed that the photoluminescence polarization anisotropy became the stronger when the band gap energy reached its minimum value and that the polarized direction was perpendicular to the surface acoustic wave propagating direction. We have also found that the time resolved photoluminescence spectra from the dynamic quantum dots exhibited emission energy oscillations similar to the results for the one dimensional standing surface acoustic waves, while no polarization anisotropy appeared. It was also found that dynamic quantum dots formed by the two dimensional surface acoustic waves due to interference between two orthogonally propagating surface acoustic wave beams. The obtained results were compared with previously obtained results.