Acta Optica Sinica, Volume. 21, Issue 2, 218(2001)
Third-Order Nonlinearities of Ag2S Nanoparticles Capped with 2,2’-Bipyridine and Hexametaphosphate
Two kinds of Ag2S nanoparticles with different surface-capping molecules (2,2’-bipyridine and hexametaphosphate ) were prepared by colloidal chemical method. Their third-order nonlinear optical properties have been studied in non-resonance region of one photon via degenerate four-wave mixing in phase conjugation geometry. The results show that two-photon resonant process greatly contributes to the third-order nonlinearities of Ag2S nanoparticles. It is also found that the third-order susceptibicities χ(3) are intensively subjected to the surface-capping molecules. This phenomenon is interpreted in terms of local field enhancement effect related to refractive index of the media around nanoparticles.
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[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese]. Third-Order Nonlinearities of Ag2S Nanoparticles Capped with 2,2’-Bipyridine and Hexametaphosphate[J]. Acta Optica Sinica, 2001, 21(2): 218