Photonics of Bio-assembled Nanostructures: Ultrafast Plasmonic Energy Transfer, Generation of Hot Electrons and Chirality

讲座名称: Photonics of Bio-assembled Nanostructures: Ultrafast Plasmonic Energy Transfer, Generation of Hot Electrons and Chirality
讲座时间 2017-09-26
讲座地点 能动学院北二楼11楼会议室
讲座人 Alexander O. Govorov
讲座内容

应西安交通大学“千人计划”学者Lionel Vayssieres教授邀请,美国俄亥俄大学杰出教授Alexander O. Govorov将于
9月26日来我校交流,并举办学术讲座,欢迎大家积极参加。

讲座题目:Photonics of Bio-assembled Nanostructures: Ultrafast Plasmonic Energy Transfer, Generation of Hot Electrons and Chirality 
讲座时间:9月26日(星期二)上午10:00-11:30
讲座地点:能动学院北二楼11楼会议室
报告摘要:
Different materials such as semiconductors, metals, biomolecules and polymers are used to fabricate hybrid nanostructures. Semiconductor quantum dots and wires are good optical absorbers and excitations in these nanocrystals (excitons) are long-lived and can be efficiently transferred via Coulomb interaction. Metal nanocrystals exhibit strong plasmon resonances and have the ability to scatter light very efficiently. Biomolecules and polymers allow us to create assemblies with precisely positioned optically-active nanocrystals, using approaches such as the DNA-origami technique. This talk will discuss a few key energy-related phenomena that appear in hybrid nanostructures:  
(1) Using plasmonic nanostructures, one can strongly enhance optical generation of heat and also confine high temperature in small volumes [1,2]. 
(2) Nanostructures with plasmonic hot spots efficiently generate energetic (hot) electrons, which can be used for photochemistry and photodetection [3,4,5]. 
(3) Colloidal nanocrystal assemblies with plasmon resonances allow us to strongly enhance the chiral optical response (circular dichroism) of biomolecules [6,7,8]. 
(4) Using DNA-assembled nanoparticle arrays made of different metals, one can transfer plasmonic signals coherently and with very small losses [9]. 

 

[1] A. O. Govorov and H. Richardson, Nano Today 2, 20 (2007).  
[2]  C. Jack, A. S. Karimullah, R. Tullius, L. Khosravi Khorashad, M. Rodier, B. Fitzpatrick, L. D. Barron, N. Gadegaard, A. Lapthorn, V. M. Rotello, G. Cooke, A.O. Govorov, M. Kadodwala, Nat. Commun. 7, 10946 (2016).  
[3] A.O. Govorov, H. Zhang, V. Demir, and Y.K. Gun’ko, Nano Today 9, 85 (2014). 
[4] H. Harutyunyan, A. B. F. Martinson, D. Rosenmann, L.K. Khorashad, L.V.Besteiro, A.O.Govorov, and G.P. Wiederrecht,  Nature Nanotechnology 10, 770–774 (2015).  
[5] M. E. Sykes, J. W. Stewart, G. M. Akselrod, X.-T. Kong, Z. Wang, D. J. Gosztola, A.B.F. Martinson, D. Rosenmann, M. H. Mikkelsen, A. O. Govorov, G. P. Wiederrecht, Nature Communications, in press. 
[6] A. O. Govorov, Fan Zhiyuan, Pedro Hernandez, J. M. Slocik, and R. R. Naik, Nano Letters 10, 1374–1382 (2010). 
[7] A. Kuzyk, R. Schreiber, Z. Fan, G. Pardatscher, E.-M. Roller, A. Högele, F. C. Simmel, A.O.Govorov, T. Liedl, Nature 483,311–314 (2012). 
[8] X.-T. Kong, R. Zhao, Z. Wang, Zhiming, A.O. Govorov, Nano Letters 17, 5099–5105 (2017).  
[9] E.-M. Roller, L.V. Besteiro, C. Pupp, L. Khosravi Khorashad, A. O. Govorov, T.Liedl, Nature Physics 13, 761 (2017).

讲座人介绍
Department of Physics and Astronomy, Ohio University, Athens, OH 45701, USA 
govorov@ohio.edu 
Alexander O. Govorov is Distinguished Professor of Theoretical Physics at Ohio University in Athens, United States. His research focuses on the theory of optical and electronic properties of nanomaterials, including nanocrystals, metastructures, bio-assemblies, etc. Dr. Govorov’s theoretical predictions motivated experiments in many research labs worldwide. Dr. Govorov is the author of more than 200 papers and some of them are highly cited. He is a Fellow of the American Physical Society and a recipient of several international awards: the Friedrich Wilhelm Bessel Research Award from the A.v.Humboldt Foundation (Germany), the Ikerbasque Fellow Award (Spain), the Walton Visitor Award (Ireland), the 2014 Jacques-Beaulieu Excellence Research Chair Award (Canada) and the Chang Jiang (Yangtze River) Chair Professorship (China).

 

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