This work was supported by CONCyTEG (Project 05-04-K117-026 A02) and by CONACyT (Project J40775-F).
Cubic optical nonlinearities with octupolar molecules at telecommunication wavelengths
G. Ramos-Ortizª, S. Romeroª, J.L. Maldonadoª, O. Barbosa-Garcíaª, M.A. Meneses-Navaª, M. Romerob and N. Farfánb
ª Centro de Investigaciones en Óptica, Apartado Postal I-948, 37000 León, Guanajuato, México, Phone: (+52 477) 441 4200, Fax: (+52 477) 441 4209, e-mail: garamoso@cio.mx
b Departamento de Química Orgánica, Facultad de Química, UNAM, Ciudad Universitaria, 04510 México D.F México.
]]> Recibido el 16 de junio de 2006
Abstract
Here we report on the cubic nonlinear optical properties of octupolar organic molecules. A series of three compounds that were of triphenylmethane derivatives and one boroxine derivative were characterized, in solid state, at infrared wavelengths comprising telecommunication bands (900 - 1600 nm). At these wavelengths, for which there is practically an absence of reports about cubic nonlinearities in octupolar compounds, we measured third-order susceptibilities χ(3) of the order of 10 -12 esu, the latter partially enhanced by multiphoton resonances. As the molecules studied were prototypes of octupolar systems, our results correlate the magnitude of the observed nonlinearities with the molecular structure, thus providing helpful information for the design of new molecules with improved nonlinearities. On the other hand, we discuss how polymer films functionalized with these molecules can be useful for applications involving the conversion of optical frequencies. Such films produce frequency-converted signals sensitive enough that they can be employed in ultra-fast optical correlators.
Keywords: Octupolar molecules; organic materials; nonlinear materials.
Resumen
Este trabajo describe las propiedades ópticas no-lineales de tercer orden de moléculas orgánicas del tipo octopolar. Una serie de tres compuestos derivados de trifenilmetano y un compuesto derivado de boroxina fueron caracterizados en estado sólido usando longitudes de onda del infrarrojo cercano, incluyendo aquellas bandas usadas en telecomunicaciones (900 - 1600 nm). Para este intervalo de longitudes de onda, para el cual prácticamente no existen reportes sobre las no-linealidades cúbicas exhibidas por moléculas octopolares, se midieron susceptibilidades no- lineales χ(3) del orden de 10 -12 esu, estas ultimas parcialmente incrementadas por resonancias multifotón. Ya que las moléculas estudiadas son prototipos de estructuras octopolares, nuestros resultados correlacionan a la magnitud de las no-linealidades observadas con la estructura molecular de forma que la informacion obtenida es útil para el diseño de nuevas moléculas con no-linealidades optimizadas. Por otra parte se discute el uso de películas de polímero, dopadas con dichas moleculas, en la conversión de frecuencias ópticas. Esta clase de películas producen señales ópticas convertidas en frecuencia con la sensibilidad suficiente para ser empleadas en correlacionadores ópticos de senales ultra-rápidas.
Descriptores: Moléculas octopolares; materiales orgánicos no-lineales.
]]>PACS: 42.65.ky; 42.70.Jk; 78.20.-e
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Acknowledgments
The authors wish to thank Dr. Sergio Calixto for the film thickness measurements with AFM and Dr. Raúl Vázquez-Nava for processing the manuscript in This work was supported by CONCyTEG (Project 05-04-K117-026 A02) and by CONACyT (Project J40775-F).
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