X-ray diffraction from perfect silicon crystals distorted by surface acoustic waves

Abstract

High-resolution X-ray diffraction measurements were carried out on ZnO/Si devices under surface acoustic wave excitation and revealed some very clear satellite diffraction peaks that are obtained from the sinusoidal modulation of the near-surface region. This experiment shows that the propagation of a Rayleigh surface acoustic wave in a perfect crystal acts as a dynamical diffraction grating. The variation of the acoustic velocity has been followed across the crystal surface from the acoustic source region (beneath the ZnO ®lm) to the far ®eld region (not covered by the ZnO ®lm).

Time-resolved coherent X-ray diffraction imaging of surface acoustic waves

“…A larger P SAW clearly leads to an increase in intensity of the satellite peaks, here shown at constant phase '. This observation is in line with previous (incoherent) reflectivity measurements of SAWs (Tucoulou et al, 2000(Tucoulou et al, , 2001) and theoretical calculations (Schelokov et al, 2004).…”

Effect of the ultrasonic frequency on the multiple X-ray scattering from a LiNbO3 crystal modulated by a surface acoustic wave

“…In these crystals the SAW ampli tude can be varied in a wide range (from zero to several angstroms) by changing the amplitude of the high fre quency electric signal applied to interdigital trans ducer (IDT). X ray diffraction, which is highly sensitive to lattice strain, is successfully used to study acoustic waves in near surface layers of crystals [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The specific features of SAW propagation in solids were monitored by X ray topography [3][4][5], grazing X ray diffraction [6,7], and double and triple crystal X ray diffraction [8][9][10][11][12][13][14][15][16][17].…”

Non-equilibrium dynamics of lipid bilayers

“…The two characteristic length scales of the SAW, namely its wavelength L and its amplitude H 1 can be extracted from time From the number of observable diraction satellites, the SAW amplitude can be determined [117,118]. c) Relative changes in peak intensity (stars, black), integrated peak intensity (squares, red), and full width at half maximum (FWHM, circles, blue) of the rocking curves shown in (a), as a function of phase φ.…”