报告题目: Nanocomposite Materials for Two-photon Excitation Applications
报告人: Qing-Hua Xu (徐清华)
Department of Chemistry, National University of Singapore
Abstract: Two-photon excitation techniques have unique advantages, such as 3-D selectivity and deep penetration into biological tissues, compared to their one-photon counterparts. In this talk, I will present our recent research work on nanocomposite materials with enhanced two-photon excitation properties and their various applications. We used two different strategies to develop nanocomposites with enhanced two-photon properties. One method is based on energy transfer from conjugated polymers, which have large two-photon absorption cross sections. We have used conjugated polymers as two-photon light harvesting complexes to develop schemes for two-photon sensing, imaging and photodynamic therapy. The second approach is to develop plasmon engineered nanocomposite materials. Noble metal nanoparticles are known to display interesting phenomenon called Plasmon resonance, which could be utilized to develop nanocomposite materials with significantly enhanced optical properties. We have developed various metal nanocomposites with enhanced two-photon excitation emission and their applications in two-photon sensing.
XU Qing-Hua received his B.S. from Zhejiang University (1993), M.S. from Peking University (1996) and University of Chicago (1997), Ph.D. from UC Berkeley (2001). He conducted the postdoctoral research at Stanford University and UC Santa Barbara before he joined NUS Chemistry in 2005. His primary research interest is development of various light based applications such as sensing, imaging, photosensitization and optoelectronics using various nanomaterials and organic/polymer materials, as well as investigation of the underlying fundamental mechanisms using various novel optical spectroscopy and imaging techniques. For more information about the research in his research group, please visit http://staff.science.nus.edu.sg/~chmxqh/.