Figure 4From: Localization of acoustic modes in periodic porous silicon structuresTime evolution of acoustic Gaussian pulses. Calculations of l n(u(z,t)) for acoustic Gaussian pulses centered at the frequency f0 indicated in each figure and σ=200 MHz for all cases. (a,b) Sample 2. (c,d) Sample 3. Zero in x-axis is placed at the surface of the PS sample.Back to article page