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Light-Induced Dispersion in Noninstantaneous Response Nonlinear Optical Materials
Qiguang Yang,JaeTae Seo,A. Jackson,B. Tabibi,H. Wang,M. Namkung,S. M. Ma,S. S. Jung,T. Skyles 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
The light-induced dispersion in noninstantaneous response third-order nonlinear optical materials has been investigated in this work. We find, even far away from resonance, both normal and abnormal dispersions can be generated in third-order nonlinear optical materials, that possess large third-order nonlinearity and finite response time. The large third order nonlinearity and the finite response time are due to the highly dispersive coupling among the pump and the probe beams. This phenomenon may be used to control the group velocity of a light pulse.
Optical nonlinearities of Au nanoparticles and Au/Ag coreshells.
Seo, Jae Tae,Yang, Qiguang,Kim, Wan-Joong,Heo, Jinhwa,Ma, Seong-Min,Austin, Jasmine,Yun, Wan Soo,Jung, Sung Soo,Han, Sang Woo,Tabibi, Bagher,Temple, Doyle Optical Society of America 2009 Optics letters Vol.34 No.3
<P>Au nanoparticles exhibited both negative and positive nonlinear absorptions with ground-state plasmon bleaching and free-carrier absorption that could be origins of the saturable and reverse-saturable optical properties. Au/Ag coreshells displayed only positive nonlinear absorption and reverse-saturable optical properties as a function of excitation intensity at the edge of surface-plasmon resonance, which implies no ground-state plasmon bleaching and the existence of two-photon absorption.</P>