| 报告题目： |
Nano-Optical Phenomena in Two-Dimensional Materials |
| 报告人： |
Zhe Fei |
| 报告人单位： |
Department of Physics and Astronomy, Iowa State University |
| 报告时间： |
6月11日（周一）下午3点 |
| 报告地点： |
科技楼北410会议室 |
| 报告摘要： |
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Nano-optics is a frontier of research that studies light-matter interactions in the nanometer length scale. One of the core research topics in the field of nano-optics is about polaritons, which are quasiparticles generated due to the collective oscillations of photons with varieties of polarization charges in materials. These hybrid light-matter modes are closely related to the fundamental optical & electronic properties of materials and provide practical approaches toward nanoscale light trapping and manipulation. In recent years, varieties of polaritons were discovered in layered two-dimensional (2D) materials. Due to the reduced dimensionality and exceptional sensitivity, this class of materials have shown many unique polaritonic properties and physics. In this talk, we present nano-optical studies of various types of polaritons in layered 2D materials using the state-of-the-art scanning near-field optical microscopy - a powerful technique enabling ultra-small and ultra-fast imaging and spectroscopy in a wide spectral range from terahertz to visible. With this powerful tool, we performed systematic investigations of plasmon polaritons in graphene [1,2], graphene nanostructures [3,4], and bilayer graphene [5], phonon polaritons in hexagonal boron nitride [6], and exciton polaritons in group VI transition metal dichalcogenides [7]. Novel physics and potential applications associated with these polaritonic modes will be discussed.
[1] Nature 487, 825 (2012).
[2] Nature Nanotech. 8, 821-825 (2013).
[3] Nano Lett. 15, 8271-8276 (2015).
[4] Nano Lett. 17. 5423-5428 (2017).
[5] Phys. Rev. Lett. 119, 247402 (2017).
[6] Science 343,1125-1129 (2014).
[7] Nature Photon. 11, 356-360 (2017). |
| 报告人简介： |
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Zhe Fei is currently an Assistant Professor in the Department of Physics and Astronomy at Iowa State University. He received his Ph.D. (2014) in the Physics Department of University of California, San Diego, B.S. (2006) and M.S. (2009) in the Physics Department of Nanjing University. Before joining Iowa State University, he served as an Assistant Scientist at the Center for Nanoscale Materials, Argonne National Laboratory. His research is focused on exploring the nano-optical physics and properties of low-dimensional materials with advanced optical imaging and spectroscopy techniques. |
