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Academic report on April 15-Professor Jing Zhao (University of Connecticut)
发布时间:2019-04-11 来源:国际化学理论中心 浏览:31


Optical Interaction   between Metal and Semiconductor Nanoparticles


Professor Jing Zhao

Reporter’s   institution

Department of   Chemistry, University of Connecticut

Report time

2019-04-15 10:00

Report location

Conference room on the ninth floor (9004) of   Hefei National Laboratory for Physical Sciences at the Microscale


Hefei National Laboratory for Physical   Sciences at the Microscale, International Center for Chemical Theory (ICCT)















Report introduction


Metal   and semiconductor quantum dots (QDs) exhibit unique size and composition   dependent optical properties. The key elements that determine their optical   properties are localized surface plasmon resonance in metal  anoparticles and excitons in quantum dots.   Particularly, we study plasmon-exciton interaction of single QDs near metal   nanoparticles. When QDs are placed near Au nanoparticles, their   exciton/multiexciton emission lifetimes and quantum yields are modified. At   the single QD level, we found that biexciton emission of the QDs near Au   nanoparticles was enhanced, and the extent of enhancement dependent on the   excitation wavelength. The emission of single QDs changes from photon   antibunching to bunching by exciting the QDs close to the plasmon resonance.   These studies suggest that plasmonic structures can be used to modify the   exciton/multiexciton emission efficiency of QDs. On the other hand, strong   coupling in hybrid metal-semiconductor nanostructures could lead to splitting   in the dark-field scattering and also fluorescence spectra due to the rapid   energy exchange between plasmon and exciton. Using correlated single-particle   spectroscopy and electron microscopy, strong coupling was observed in   Au-QD-Au sandwiched nanostructures.