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|Title:||Nonresonant optical nonlinearity of ZnO composite nanoparticles with different interfacial chemical environments|
Nonresonant optical nonlinearity
Optical stark effect
|Source:||Wang, R.,Wu, X.,Zou, B.,Wang, L.,Xie, S.,Xu, J.,Huang, W. (1998). Nonresonant optical nonlinearity of ZnO composite nanoparticles with different interfacial chemical environments. Materials Research Innovations 2 (1) : 49-52. ScholarBank@NUS Repository.|
|Abstract:||ZnO nanoparticles coated by surfactant molecules were synthesized by microemulsion method. Under proper thermal treatment, a new ZnO/surfactant composite nanoparticles were formed and exhibited an unique optical property. The third-order optical nonlinearity χ(3) of ZnO composite nanoparticles with different interfacial chemical environment were measured by single-beam Z-scan technique, the sign and magnitude of both the real and imaginary parts of χ(3) at 790 nm were measured to be: -5.2×10-16 m2/W and 11.6 cm/Gw for ZnO/DBS composite nanoparticles (DBS, dodecyl benzene sulfonate, anionic surfactant); and -2.2×-17 m2/W, 0.45 cm/Gw for ZnO/CTAB composite nanoparticles (CTAB, cetyltrimethyl ammonium bromide, cationic surfactant). The ultrafast nonlinear response time (∼250 fs) measured by time-resolved pump-probe technique at excitation wavelength of 647 nm suggests that the optical nonlinearity below band-gap originate mainly from a rapid electronic polarization process or virtual process such as the optical Stark effect. © Springer-Verlag 1998.|
|Source Title:||Materials Research Innovations|
|Appears in Collections:||Staff Publications|
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