Abstract
We demonstrate the use of stable films containing PbS nanocrystals as media for self-adaptive phase filtering in phase contrast imaging of transparent objects by a cost-effective exploitation of nonlinear optical refraction in a simple, all-optical, and self-adjusting imaging system. The optical nonlinearity is characterized by z-scan technique using a continuous wave He–Ne laser as the excitation source. The mechanism of nonlinearity in this case is mainly due to the nonlocal thermo-optical interaction between the laser beam and the sample. The value of nonlinear refractive index coefficient is found to be . The nanocomposite material shows a thermal lens effect and is a potential candidate for phase contrast imaging.
© 2009 Optical Society of America
Full Article | PDF ArticleMore Like This
Ribal Georges Sabat and Paul Rochon
Appl. Opt. 48(14) 2649-2654 (2009)
Hervé Rigneault, François Flory, and Serge Monneret
Appl. Opt. 34(21) 4358-4369 (1995)
Guang Shi, Yunbo Li, Junyi Yang, Yuxiao Wang, Yinglin Song, and C. H. Wang
J. Opt. Soc. Am. B 26(3) 420-425 (2009)