Transient photo-reflectance changes and corresponding FFT spectra.(a) Transient photo-reflectance changes taken on the amorphous [Si/Sb80Te20]2film at different laser irradiation powers but the same pump power of 15 mW during the measurement. (b) Amplified plot with 15-mW irradiation power. (c) Transient oscillation of COPs retrieved from (a). (d) FFT spectra corresponding to (c).
Zhu et al. Nanoscale Research Letters 2012 7:638 doi:10.1186/1556-276X-7-638