Figure 3
Surface charging of the LiNbO3 substrate under the synchrotron X-ray beam. (a) Shift between the two extreme spectra, indicating the amplitude of the SAW (black squares), and parallel shift of the two spectra, indicating an increase of surface charging (blue squares), as a function of the beam intensity at constant SAW excitation amplitude. (b) Global shift (averaged over a sample area containing equal content of all SAW phases) for the same data set as shown in Fig. 2 as a function of SAW excitation amplitude, indicating a reduction of charging at increasing SAW power. |