Prof. Masayoshi Tonouchi
Osaka University, Japan
Masayoshi Tonouchi received the B.S. and M.S. and Dr. E. degrees form Osaka University, Japan, in 1983, 1985 and 1988, respectively. From 1988 to 1989 he worked at the Faculty of Engineering Science of the same university. From 1989 to 1994 he joined the Faculty of Computer Science and System Engineering, Kyushu Institute of Technology, Japan. In 1994, he moved to Kansai Advanced Research Center, Communications Research Laboratory, Japan. From 1996 to 2000, he was an associate professor at the Research Center for Superconducting Materials and Electronics, Osaka University. Currently he is a professor in Institute of Laser Engineering, Osaka University and a concurrent professor of Nanjing University. His current research interests include ultrafast optical and terahertz science of strongly correlated electron systems and nanomaterials, and development-and-applications of terahertz systems such as the laser terahertz emission microscope, compact THz time-domain spectroscopy systems, and others. He is a member of the Optical Society of America, Materials Research Society, the Japan Society of Applied Physics, the Physical Society of Japan, and the Institute of Electronics, Information and Communication Engineers. He is an associate editor for Journal of Applied Physics, AIP since Jan.1st, 2015. He chaired many international conferences such as OTST 2013.
Speech Title: Terahertz Nanoscience
Abstract: Two novel methods of THz time domain spectroscopy for nanomaterial characterization are introduced; THz parallel plate waveguide TDS for ultrathin conductive materials, and temperature programmed laser THz emission microscope (LTEM) [1,2]. THz TDS is a strong tool for material characterization but not for graphene. We have a problem on the SN ratio of electric field signal amplitude, which is typically just around 1000 and easily goes down to 300 - 500 considering substrates even at peak amplitude, and at THz frequencies, the standard deviation of the transmittance in usual TDS system is 0.5% or higher. Intrinsic graphene has a transmittance of around 97%, which largely changes depending on contaminations, such as oxygen, and the substrates by charge transfer. As a result, sometime the transmittance further increases, which increases uncertainty in the data. To overcome the problem, we recently proposed to use THz parallel plate waveguide to increase interaction length with graphene and THz waves, which allow us to observe strong absorption of the THz waves when the graphene is placed in the center of the waveguide[3,4]. New extraction theory has been provided and the estimation agrees with the existing data. we also determine the lower limit of detection of the PPWG-THz-TDS approach. We provide a closed-form expression of the minimal measurable conductivity by the system. The temperature programed LTEM provides us a new technique to study molecular dynamics on graphene. We observe temperature dependence on THz emission amplitude locally excited from graphene covered InP wafers. The emission is generated by the photocarrier acceleration at the InP surface due to built-in-field, which is quite sensitive on the surface potential. From the temperature dependence of the amplitude, we successfully estimated the adsorption energy of oxygen on graphene for the first time, which coincides with some predicted values by the first principle calculation.
Prof. Takashige Omatsu
Chiba University, Japan
Takashige Omatsu (B.S. (1983), Ph.D. (1992) from
the University of Tokyo) is a professor of nano-science division of a faculty of
engineering in Chiba University.His research intersts cover a variety of areas,
such as nonlinear optics, solid-state and fiber lasers, singular optics, and
super-resolution spectroscopy. Recent work has focused on chiral control of nano-structures
by angular momentum of light. Such chiral nano-structures will potentially
provide a new scientific aspect to metamaterials, plasmonics, and silicon
photonics, and they might also enable us to develop nanoscale imaging systems
with chiral selectivity.
He has already published >100 refereed journal articles, and he has performed >20 invited presentations of major international conferences, including CLEO, CLEO Pacific-Rim, CLEO Europe, LEOS, and ICALEO meetings. He has been appointed as an Associate Editor of Optics Express during 2006-2012.
He is also on the editorial board of Applied Physics Express.
He is currently working as a steering committee member of the conference on the laser and optoelectronics pacific-rim (CLEO Pacific-rim).
Professor Omatsu is a Fellow of the Japan Society of Applied Physics, and a Senior Member of the Optical Society of America. He is also Visiting Professor, Xinjiang Normal University, China.
Prof. Der-Jang Liaw (Chair Professor)
National Taiwan University of Science and Technology, Taiwan
Professor Der-Jang LIAW, Polymer Science Doctor (Ph.D. Polymer), is currently a Chair professor of Chemical Engineering at National Taiwan University of Science and Technology (NTUST). He holds his Master and Ph.D degrees in polymer science at Osaka University (Japan) and published about 360 SCI papers (h-index = 44 from ISI Web of Knowledge), 180 conference papers and 60 patents. In 2009, he was a recipient of the International Award from the Society of Polymer Science, Japan along with Prof. J. M. J. Frechet (USA) and Prof. K. Muellen (Germany). He received the Outstanding Polymer Academic Research Prize in 2012 and Lifetime Achievement Prize from The Polymer Society of Taiwan in 2013. He has been a fellow of The Polymer Society of Taiwan since 2014 and has been Academician of the Russian Academy of Engineering since 2011.
Speech Title: Advanced Polymeric Nanomaterials：Synthesis and Applications for Optoelectronics
Advanced polymeric materials including triarylamine-containing conjugated
polymers, polyimides, polyamides and polynorbornenes were prepared for
optoelectronic and energy applications. Polynorbornenes with self-assembly
amphiphilic architecture containing hydrophilic ammonium salt and hydrophobic
alkyl ester group were obtained by ring-opening metathesis polymerization
(ROMP). Polyimides were prepared via polycondensation, which could be used as
alignment films. Colorless-to-colorful electrochromic polyimides with very high
contrast ratio were prepared from non-coplanar based diamine and alicyclic
dianhydride, which exhibited fast response speed and high contrast ratio. In
addition, triarylamine-based conjugated polymers and polynorbornenes were
deposited on flexible monolayer graphene-based electrode for electrochromism.
Both polymers showed high thermal stability up to 300 oC.
A novel concept of an electrode buffer layer material, exhibiting either hole transporting or reducing electrode work function (WF) properties, was demonstrated by the example of a polymeric compound PDTON. Depending on the composition ratio of acetic acid and ethyl acetate upon dispersing, PDTON formed two kinds of nanospheres, serving as building blocks and defining the morphology and properties of the respective materials, termed as A-PDTON and C-PDTON. These materials were suitable for hole transport (triphenylamine on the surface of A-PDTON nanospheres) and reducing the WF of an electrode due to the formation of a suitable interfacial dipole (C-PDTON), respectively. A-PDTON could be used as an ABL and C-PDTON as a CBL in the model OSCs, OLEDs, and PSCs, resulting in a comparable or even superior performance compared to the standard devices.
Prof. Hongwei Zhu (Vice Dean of School of Materials Science and Engineering)
Tsinghua University, China
Prof. Zhu is a Professor, Vice Dean of School of Materials Science and Engineering, Tsinghua University. He received his B.S. degree in Mechanical Engineering (1998) and Ph.D. degree in Materials Processing Engineering (2003) at Tsinghua University. After Post Doc. studies in Japan and USA, he began his independent career as a faculty member at Tsinghua University (2008~present). He is well-known internationally for his work on carbon nanomaterials. His current research involves multi-scale synthesis and assembly, characterizations and applications of materials. He has authored 3 books and 8 invited book chapters, received 20+ patents and published 200+ journal papers including Science, Chem. Soc. Rev., Sci. Adv., Adv. Mater. and Nano Lett., with >12000 citations (H-index: 55). He received several awards including National Natural Science Award of China, Natural Science Award for Outstanding Scientific Research Achievements (Ministry of Education), Graphene Innovation and Entrepreneurship Competition Award (China Innovation Alliance of the Graphene Industry). The group he has put together is a world leader in graphene materials production and applications.
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