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[5]. 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.

Speech Title: Angular momentum of light creates helical structures

Abstract: Helical light, so called optical vortex with a helical wavefront and an annular spatial form, carries an orbital angular momentum, ℓħ, (ℓ is called the topological charge).
Such optical vortex has been attracting much attention in many fields, such as optical manipulation, optical telecommunications, quantum physics, nonlinear optics, and microscopy. In recent years, we and our coworkers discovered that optical vortex enables us to twist variety of materials to create helical nano/micro-scale structures with the aid of spin angular momentum arising from circular polarization with a helical electric field. We also discovered that the handedness of formed structures can be controlled merely by changing the handedness of the optical vortex.
In this presentation, we review unique helical structured materials on a nano/micro scale fabricated by illumination of optical vortex. Such helical structures will lead to new fundamental and advanced materials sciences. For instance, they will enable the efficient selective detection and reaction of the chemical composites with the chirality. They will also open the door to develop plasmonic bio-MEMS to activate a living cell.

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 NanomaterialsSynthesis and Applications for Optoelectronics

Abstract: 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.