Absorption non-linear

In the last few decades, metal clusters and nanomaterials have attracted increasing attention due to their unique properties which differ from those of the bulkd Metal nano-objects are of great interest in the field of nanosciences. They are the ideal structures for fundamental research and applications. Indeed, from the confinement of the charge carriers in such limited objects, one expects a shift of the plasmon resonance absorption, non-linear optical effects, non-metallic conductivity, and nanocatalytic effects. Nanomaterials can have important applications in several fields such as catalysis, electrocatalysis, electronics, optical limitation, biology, etc. 

Keywords. Two-photon absorption. Non-linear transmission, Z-scan, Optical power limiting. Up-converted lasing... 

Further applications of the non-linear eikonal approximation are discussed here. We are interested in absorptive non-linearity whose sources are molecular photoexcitatons. Propagation effects of an intense light field in organic molecular media are discussed and their connection to molecular parameters is emphasized. 

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