Nonlinear transmission in suspensions of poly(isothianaphthene)

Asa Fein; Pnina Shaier; Baruch Zinger; Zvi Kotler

doi:10.1117/12.187536

23 September 1994 Nonlinear transmission in suspensions of poly(isothianaphthene)

Asa Fein, Pnina Shaier, Baruch Zinger, Zvi Kotler

Proceedings Volume 2285, Nonlinear Optical Properties of Organic Materials VII; (1994) https://doi.org/10.1117/12.187536
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

An important potential application of organic materials for nonlinear optics lies in the field of optical switching and power limiting. One advantage of using polymeric suspensions is that one can chemically control the position of the absorption peaks thereby changing nonlinear properties associated with absorption. In this work we report on the nonlinear transmission characteristics of Poly(isothianaphtene) suspended in various solvents. The polymers were synthesized from Dichloro-o-xylene and polymerized with the use of several oxidizing agents. Submicronic particles were obtained by crushing and straining the polymers. We investigated the nonlinear transmission threshold its dependence on the oxidizing agents and the solvents and the mechanisms leading to the nonlinearity. Measurements were carried out at 1064 nm. In some cases nonlinear transmission thresholds were found to be comparable to that of carbon black suspensions. The absorption per particle was found to be important in determining the nonlinearity threshold. The mechanism responsible for the nonlinearity was identified as thermal in nature and is characterized by scattering, plasma formation, self action of the medium and increased absorption due to particle break up. This mechanism is close to that found in carbon-black suspensions but with some important differences that will be discussed.

Citation Download Citation

Asa Fein, Pnina Shaier, Baruch Zinger, and Zvi Kotler "Nonlinear transmission in suspensions of poly(isothianaphthene)", Proc. SPIE 2285, Nonlinear Optical Properties of Organic Materials VII, (23 September 1994); https://doi.org/10.1117/12.187536

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KEYWORDS

Absorption

Polymers

Scattering

Particles

Laser scattering

Atmospheric particles

Diffusion

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