Optical Second Harmonic Generation in Langmuir-Blodgett Films
Materials displaying nonlinear optical (NLO) effects are attracting increasing interest because of their potential applications in devices for processing optical information in optical communication systems1–2. Many organic materials have been shown to possess very large nonlinearities which can be attributed to the highly polarisable π—electrons3. A large molecular hyperpolarizability, β, responsible for second-order effects can be achieved in the charge asymmetric donor-acceptor molecules. However, to achieve large bulk second-order effects it is necessary to arrange the individual molecules in a noncentrosymmetric structure in order to avoid cancellation of the individual molecular nonlinearities.
KeywordsHarmonic Intensity Local Field Factor Second Harmonic Generation Measurement Linear Fresnel Noncentrosymmetric Structure
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