学术报告
报告题目：Extraordinarily transparent compact metallic metamaterials
报告人：Vincenzo Giannini[Instituto de Estructura de la Materia (IEM-CSIC), Spain]
时间：2019-09-25（周三）上午 9:30
地点：泰达应用物理研究院四楼报告厅
邀请人：任梦昕 副教授
摘要：Metals are highly opaque, yet we show numerically and experimentally that densely packed arrays of metallic nanoparticles can be more transparent to infrared radiation than dielectrics such as germanium, even for arrays that are over 75% metal by volume. Despite strong interactions between the metallic particles, these arrays form effective dielectrics that are virtually dispersion-free, making possible the design of optical components that are achromatic over ultra-broadband ranges of wavelengths from a few microns up to millimetres or more. Furthermore, the local refractive indices may be tuned by altering the size, shape, and spacing of the nanoparticles, allowing the design of gradient-index lenses that guide and focus light on the microscale. The electric field is also strongly concentrated in the gaps between the metallic nanoparticles, and the simultaneous focusing and squeezing of the electric field produces strong ‘doubly-enhanced’ hotspots which could boost measurements made using infrared spectroscopy and other non-linear processes over a broad range of frequencies, with minimal heat production.
简历：Dr Vincenzo Giannini started his scientific adventure as physics undergraduate students at the University of Pisa. He moved to Spain for a Ph.D. program at the Spanish research council (CSIC) in Madrid. After a postdoc in Amsterdam and a Marie Curie fellowship at the Imperial College London, in June 2014, Dr Giannini started his own group at the Imperial College London in the Condensed Matter Theory section. Recently Giannini accepted an offer in Madrid and moved back to Spain at the CSIC.
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