The 321st MANA & the 135th ICYS Joint Seminar
Dr. Dai-ming Tang & Dr. Hiroyuki Takeda
| Date | March 15, Friday |
| Time | 15:30-16:30 |
| Place | Auditorium, 1F, WPI - MANA Building, Namiki Site, NIMS |
Download PDF file for seminar info.
15:30-16:00
Mechanics of Individual Nanostructures by In Situ TEM: Role of Geometry and Defects
In this talk, I would like to share our recent progresses on the mechanical properties of individual nanostructures by using direct in situ transmission electron microscopy (TEM), with particular considerations on the role of imperfections.
With WS 2 nanotubes as a model structure, the tensile properties and fracture processes were directly investigated. Surprisingly, it was found that the imperfect thick WS2 nanotubes could bear much higher loadings than the thin WS2 nanotubes with almost “defect-free” structures studied previously. HRTEM characterizations and real time observations revealed that the anomalous tensile properties are related to the inter-shell crosslinking and geometric constraints; these resulted in the multishell loading and fracturing.
Speaker
Dr. Dai-ming Tang, ICYS-MANA Researcher, MANA, NIMS
Chair
Dr. Dmitri Golberg, MANA PI, MANA, NIMS
16:00-16:30
Exciton-polaritons in organic-dye nanofibers with optical anisotropies
Light propagation in organic-dye nanofibers is different from that in conventional dielectric waveguides. For example, group refractive indices are more than 10, and leakage of light can be neglected even in sharply bent nanofibers with a radius of curvature less than ten microns. These properties result from exciton-polaritons. Unlike in inorganic semiconductors, however, organic crystals have strong optical anisotropies. In this talk, I show the importance of optical anisotropies in exciton-polariton mediated light propagation.
Speaker
Dr. Hiroyuki Takeda, ICYS-Sengen Researcher, NIMS
Chair
Dr. Hideki Miyazaki, Group Leader, Plasmonics Group, NIMS