Figure 2From: Optical absorption and photoluminescence studies of gold nanoparticles deposited on porous siliconSEM images of PSi. (a) Top view of PSi etching using pulsed current method at a constant peak current density of 10 mA/cm2 with cycle time, Tall, 14 ms and pulse time, Toff, 4 ms and (b) cross section of the pores with estimated length of 7.4 ± 3 μm.Back to article page