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恒元物理学讲座(第119期)


时间:2018/5/26 11:39:11作者:kyms点击量:475

报告题目:When Plasmons Meet 2D Transition Metal Dichalcogenides

人:张顺平 副教授(武汉大学)

报告时间:2018年5月31日(星期四),上午9:00

报告地点:物理学与信息技术学院六层学术报告厅(致知楼3623)

报告摘要:

Metallic nanostructures attract considerable interest in the past two decades due to their outstanding capability of concentrating light at the deep subwavelength scale. The direct consequence of this effect is the ultrasmall mode volume of the optical modes that can boost the light-matter interaction. On the other hand, momolayer transition metal dichalcogenides (TMDs) show excellent optoelectronical properties that arose significant enthusiasm. The integration of metal nanostructures with TMDs joints the good sides from the two constitutes, leading to extra functionalities that are appealing for integrated nanophotonic applications. In this talk, I will show that the combination of proper chosen metal nanorods with a monolayer WSe2 yields hybrid states (plexcitons) resulting from the strong coupling of plasmons and excitons [1]. Rabi splitting as large as 49.5 meV can be obtained at room temperature. In a nanoparticle-over-miror (NPOM) system, the single atom layer behaves as a well define probe for surface enhanced Raman scattering [2] and fluorescence emission [3]. Finally, by combining the strong second order nonlinearity of monolayer TMDs with crystallined silver nanowires, plasmonic fibers [4], we show how to realize momentum-conversed second harmonic generation (SHG) for surface plasmon polaritons (SPPs). Transversely divergent but axially collimated SHG output from the hybrid system is observed by Fourier imaging [5].

1. D. Zheng, S. P. Zhang, Q. Deng, et al., Nano Lett. 17, 3809 (2017).

2. J. W. Sun, H. T. Hu, D. Zheng, et al, Submitted.

3. W. Chen, S. P. Zhang, M. Kang, et al, Submitted.

4. Wei, H.; Pan, D.; Zhang, S. P.; et al, Chem. Rev. DOI:10.1021/acs.chemrev.7b00441 (2018).

5. Li, Y.; Kang, M.; Shi, J.; et al., Nano Lett. 17, 7803-7808 (2017). 

报告人简介:

张顺平,武汉大学物理科学与技术学院副教授。2008年本科毕业于中山大学,2013年1月在中国科学院物理研究所获得博士学位,随后加盟武汉大学物理学院,2015年4月起任副教授。主要研究领域为表面等离激元光子学、纳米光子学,近期在纳米腔中的光与物质相互作用、等离激元波导中的二阶非线性过程以及超灵敏纳米光学传感器研究方面有突破性进展。已在Phys. Rev. Lett.、Nat. Commun.、PNAS、Nano Lett.、ACS Nano等杂志上发表学术论文30篇,H-index为17。 

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                                               物理学与信息技术学院

2018年5月25日  

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