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.


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.


Dr. Dai-ming Tang, ICYS-MANA Researcher, MANA, NIMS


Dr. Dmitri Golberg, MANA PI, MANA, NIMS


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.


Dr. Hiroyuki Takeda, ICYS-Sengen Researcher, NIMS


Dr. Hideki Miyazaki, Group Leader, Plasmonics Group, NIMS