FROM VIBRATIONAL INTENSITY SPECTROSCOPY TO NONLINEAR-OPTICAL PROPERTIES OF ORGANIC-MOLECULES IN ELECTRONICS AND PHOTONICS

A new use of vibrational intensity spectroscopy is proposed for the ch aracterization of non-linear optical responses of polyconjugated organ ic molecules. The experimental and theoretical results obtained for se veral molecules are reported and discussed. These data prove that it i s possible to use the vibrational approach as a new method for measuri ng molecular hyperpolarizabilities, which in some cases can be competi tive with the more traditional ones. A theoretical justification of th e method is also presented.