By using the electric-field-induced second-harmonic generation effect, we have detected electrical signals present on a complementary metal-oxide-semiconductor (CMOS) integrated circuit in a noncontact geometry. Femtosecond pulses with a wavelength of 2.16μm were incident on the device and the second harmonic at 1.08μm exhibited a field-dependent behavior. The conversion efficiency from the fundamental to the second harmonic was estimated to be −103dB.
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Dong et al. (2006) studied this question.
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