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Nonlinear refraction of Coomassie brilliant blue dye in PVA matrix

Journal of Materials Science, ISSN: 0022-2461, Vol: 40, Issue: 3, Page: 777-778
2005
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Article Description

The nonlinear refraction of organic chromophore Coomassie Brilliant Blue R-250 (LOBA CHEMIE) dye was investigated using Z-scan technique. The Z-scan experiment was performed using a 632.8 nm cw He-Ne laser beam, which was tightly focused on to the sample using a lens of focal length 7.5 cm. The Z-scan curve was characterized by a prefocal peak, followed by a post-focal valley, which implies that the nonlinear refractive index is negative. Coomassie Brilliant Blue R-250 dye prepared in the solid film form in polyvinyl alcohol (PVA) exhibits a negative refractive nonlinearity, which may be occur due to the self-defocusing effect caused by the local variation of refractive index with temperature and from the Z-scan data.

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