报告题目：Towards reconfigurable infrared metamaterials and plasmonics
报告人：Dr. Kan Yao,University of Texas at Austin
报告摘要： The dynamic interplay between metamaterials and plasmonics has enabled many innovative concepts. Despite their continuous blending, there are still several sub-fields not fully explored and limitations not yet resolved. For instance, metals do not support pronounced plasmonic resonances in the mid-/far-infrared regime; most metamaterials and plasmonic devices have fixed functionalities once fabricated. Since their optical properties rely on both the constituents and how the building blocks are shaped and organized, introducing variables, such as changeable material properties and/or reconfigurable structures, may lead to new opportunities for dynamically tunable metamaterials and plasmonics. In this talk, several possible solutions will be discussed. I will show plasmonic core/shell particles and their self-assembled clusters as infrared resonators, ultra-compact nanoantennas with switchable and unidirectional radiation properties, and tunable graphene metasurfaces for infrared light beam shaping. If time permits, I will also discuss another topic on nano optics beyond visible, namely the chiroptical sensing at ultraviolet wavelengths.