Abstract
In this work, we report on the synthesis and non-linear optical studies of PMMA polymer films deposited on Si〈111〉 wafers by using the spin-coating method. The transport features were measured using a four-probe method. The excitation was provided by 10 ns pulses of λ=1.32 μm YAG: Nd laser. The photoinduced laser light was polarized by a rotating Fresnel polarizer, and the output light powers were detected using a fast response photomultiplier. At low voltages, the photoinduced dependence of optical constants does not show an essential change with respect to the photoinduced power. The effect exists only on the nano-interfaces occurring on the borders. Drastic changes are observed only at higher voltages (about 6 V), which correlates with a drastic increase of the current. A novel mechanism describing low dc-elecric field for the trapping current by tunneling is proposed.
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