Journal of Materials Chemistry · 2002 · 32 citations · 8 references
Natural SciencesChemistryMaterials ScienceOptical MaterialsPhotonicsSpectroscopyNonlinear Optical MaterialsNonlinear OpticsOptical Properties Of MaterialsOptical Properties Of SolidsOptical SpectroscopySaturable AbsorptionExcited-state AbsorptionInorganic Nonlinear Optical MaterialsMolecular Nonlinear OpticsNonlinear AbsorptionNonlinear SpectroscopyOptical NonlinearityPhotoinduced AbsorptionTwo-photon Absorption
The Z-scan technique has been successfully used to determine the magnitudes and signs of the fifth-order optical nonlinearity induced by two-photon absorption. Here, it was used to investigate the fifth-order optical nonlinearity induced by saturable-absorption (SA) of a charge-transfer salt (TBA)2Ni(dmit)2 (TBA = tetra-n-butylammonium, dmit = 2-thioxo-1,3-dithiole-4,5-dithiolate) with 1064 nm pulses. Under excitation by these 1064 nm pulses, the titled molecule exhibits a typical SA effect at relatively low levels of intensity, while showing strong excited-state absorption (including the first and second excited-state) induced by SA at high intensity levels. Such an excited-state absorption is related to the fifth-order effect. The magnitudes and signs of the fifth- and third-order nonlinearities were estimated. Additionally, the optical limiting effect of this molecule in a dimethyl sulfoxide solution was also studied.
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Third- and fifth-order optical nonlinearities in organic materials
A. A. Said, C.C. Wamsley, David J. Hagan et al. · Chemical Physics Letters · 1994 · 126 citations · Full text