March 09, 2015 Professor Hiroyuki Fujita
Center for International Research on Micronano Mechatronics,
Institute of Industrial Science, The University of Tokyo
Nano-Lab-in-TEM: How MEMS devices enrich in situ TEM observation
My research group has investigated MEMS (micro electro mechanical system) fabrication and microactuators since 1986. Recently, we inserted and operated active MEMS devices in the specimen chamber of the transmission electron microscope (TEM); this allows us to perform mechanical, electrical and chemical in situ experiment with sub-nm visualization.
We conducted the tensile and shear testing, and the heat transfer measurement of nano junctions. The behavior of a gold nano junction during contact and separation of two sharp tips looked very much like a water meniscus. More interestingly, the tensile testing of a silicon junction of a few nm in diameter showed its extraordinary large plastic deformation. The shear deformation of a silver nano junction exhibited series of sub-nm steps correlated with the crystalline spacing of the material; this is like a miniaturized version of stick-slips during frictional motion. Furthermore, the heat transfer through a short and thin, both in a few nm, silicon junction was much higher than the bulk value because of ballistic heat transfer. Also we have built a MEMS liquid cell in which the growth of a gold electrode by electroplating was observed in real time.
February 17, 2015 Professor Eli Kapon
Laboratory of Physics of Nanostructures
Ecole Polytechnique Fédérale de Lausanne (EPFL)
Quantum Nanophotonics: Exploiting quantum and optical confinements at the nanoscale
The effects of combined quantum confinement and optical confinement in semiconductor nanophotonic systems are reviewed, as well as their exploitations in generating and manipulating low-dimensional electronic states and non-classical states of light. The implementation of such confined systems based on site-controlled epitaxial growth of quantum dots and quantum wires and integration with various nanophotonic structures are introduced and discussed. This progress should be useful for developing single-photon integrated circuits and elements of quantum information technology systems.