NDLI: Third-order optical nonlinearities in mesoionic compounds

Content Provider	IEEE Xplore Digital Library
Author	Bezerra Jr., A.G. Gomes, A.S.L. Athayde-Filho, P.F. da Rocha, G.B. Miller, J. Simas, A.M.
Copyright Year	1998
Description	Author affiliation: Centro Federal Educ. Tecnologica do Parana, Puerto Rico, Brazil (Bezerra, A.G., Jr.)
Abstract	We describe the application of the well-known Z-scan technique to determine the nonlinear refractive index, n/sub 2/, of seven different mesoionic compounds. The samples were synthesized in our laboratory, based on quantum chemical AM1-TDHF calculated structures. Solutions in DMSO with concentrations around 10/sup 19/ molecules/cm/sup 3/ were prepared. Typical sample length varied between 0.2 mm and 5 mm. The linear absorption coefficient at the pump wavelength varies between 0.1 cm/sup -1/ and 10 cm/sup -1/ for all the samples. The observed peak-to-valley shape of the transmittance variation as a function of the linear displacement of the sample along the propagation direction, Z-axis, is characteristic of a self-defocusing (negative) nonlinearity. The measured values of n/sub 2/ are given. The macroscopic and microscopic third-order optical nonlinear coefficients can be related to each other through /spl chi//sup (3)/=Nf/sup 4//spl gamma/, where f is a local field correction factor given by f=[n/sub 0//sup 2/(/spl omega/)+2]/3, N is the number of molecules per cm/sup 3/, and n/sub 0/ is the linear index of refraction. Using this relation we have estimated the values of the second-order hyperpolarizability, /spl gamma/. Our results indicate that a structure like MI-7, which is planar, presents a better disposition of the donor and acceptor groups when compared to MI-2, a nonplanar structure. The facility to engineer and synthesize these organic materials may lead to the highest possible nonlinear susceptibilities for these structures, which may have potential applications to photonics.
File Size	145034
File Format	PDF
ISBN	1557525412
DOI	10.1109/IQEC.1998.680095
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-05-08
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Optical Soc. Of America
Subject Keyword	Nonlinear optics Optical pumping Optical refraction Optical variables control Optical microscopy Refractive index Laboratories Chemicals Absorption Shape
Content Type	Text
Resource Type	Article

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