Figure 4From: Photoacoustic effects in nanocomposite structure ‘porous silicon-liquid’Time-dependent voltage of the piezoelectric transducer. Structural parameters of the porous silicon layers are (a) l por = 50 μm and ε = 65%; (b) l por = 30 μm and ε = 65%; (c) l por = 50 μm and porosity ε = 60%; and (d) l por = 30 μm and ε = 60%Back to article page