新加坡南洋理工大学李述周教授9月26日下午学术报告

发布时间:2014-09-17访问量:57设置

报告人:李述周教授

School of Materials Science and Engineering,Nanyang Technological University,Singapore, 639798; Phone: +65 6790 4380; Fax: +65 6790 9081; Email: lisz@ntu.edu.sg

题目Plasmonic Properties of Coupled Nanostructures

时间2014926星期五下午200

地点:909号楼一楼B会议室(Conference Room B, 909-1F)

 

摘要:

Noble metallic nanostructures have great potential in optical sensing application in visible and near-infrared frequencies. Their plasmonic properties could be manipulated by in-situ controlling their electron densities. However, the effect of charging remains underexplored for coupled systems. We theoretically investigated the dependence of their far-field and near-field properties on their electron densities for various gold structures. With increasing electron densities, their enhancement factors increase while their plasmonic resonance peaks are blue-shifted. The resonance peak position of ellipsoid-ellipsoid dimers shows the highest sensitivity in response to the charging effects with the slope of -2.87. The surface-averaged electric field of ellipsoid monomer shows largest enhancement ratio of 1.13 with 16% excess electrons. These results can be well explained by an effective dipole moment model. In addition, we also studied the sphere-on-substrate nanostructure which can be precisely fabricated. In another project, using finite-difference time-domain method, we demonstrate that spiky nanoparticle dimer (SNPD) can provide hot spots with both large electric field enhancement and large volume because of the pronounced lightning rod effect of spiky nanoparticle.

 

个人简历:

Dr. Li Shuzhou received his B.Sc, M.Sc, and PhD in chemistry from Nankai University, Peking University, and University of Wisconsin, respectively. After studying plasmonics in Northwestern University as a postdoc, he joined school of materials science and engineering in Nanyang Technological University. Currently, his research interests have been focused on (1) design high sensitive substrates for surface enhanced Raman scattering and fluorescence; (2) optical properties of metal-semiconductor nanostructure; (3) Assembly of metallic nanostructures. He has published more than 40 research papers on peer-reviewed journals, including Nat Commun, Adv Mater, J Am Chem Soc, Angew Chem Int Ed, and Nano Lett.

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