Nonlinear Correlation
Spectroscopy (NLCS)
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Abstract
We present a novel concept for optical spectroscopy called
nonlinear
correlation spectroscopy (NLCS). NLCS analyses coherent field fluctuations
of the second and third harmonic light generated by diffusing nanoparticles.
Particles based on noncentrosymmetric nonlinear materials such as
KNbO<sub>3</sub> show a strong second as well as third harmonic response.
The method and the theory are introduced and experimental NLCS results
in fetal calf serum are presented showing the promising selectivity
of this technique for measurement in complex biological environments