Japan Science and Technology Agency (JST) have launched a new program called strategic promotion of innovative
research and development ( S-Innovation ). Projects chosen for the S-Innovation program are selected from among the
research output of JST's strategic and basic research programs, such as CREST, ERATO, Sakigake and PREST, which
aim to create innovative new technologies, lead to the advancement of science and technology and the emergence of new
industries. S-Innovation covers R&D themes from the aforementioned programs and is based on the seamless, long-term
pursuit of R&D toward the practical application of novel technologies. It is envisaged that the innovation resulting from
such technologies will form the foundations of future industries. Currently the program consists of four projects in which
photonics polymers are included. The photonic polymer research consists of five topics such as development of fast
organic photorefractive polymers for advanced optical communication technology, development of new device
technology based on nano-ordered structures of polymers, development of three-dimensional vector wave memory,
optical interconnect device technology using high performance photonic polymers and development of quantum
photonic technologies with polymer optical nano-fibers. Each topic is funded approximately $1.0 M/year for ten years.
The objectives and unique features of S-innovation and the highlights of each topic are described.
We report a series of polymers with linear, macrocyclic and hyperbranched structures for electroluminescent (EL) applications. The polymers are polycarbazoles (PC) containing different substituents. The polymers are amorphous and are soluble in common organic solvents such as chloroform, and tetrahydrofuran (THF). High optical quality films were obtained by spin-coating from the polymer solutions of chloroform or THF. All these polymers show strong photoluminescence under a UV-lamp illumination. Single and bilayer EL devices consisting of anode/hole transfer layer/electron transfer layer/cathode have been fabricated and characterized. The effects of polymer structures on the energy levels and EL properties are discussed. The results indicated that macrocyclic oligomers and hyperbranched polymers are new candidates for EL devices.
We describe the results of the investigations of optical nonlinearities in fullerenes in various forms, ranging from solutions to composites devised in device-oriented forms. Two types of optically-induced nonlinearities are of great interest here: third-order nonlinearity and photorefractivity. The third-order nonlinearity has been investigated by a combination of photoinduced transient absorption and optical Kerr gate, using femtosecond pulses at 615 nm and 796 nm. Specially useful here is the new technique of femtosecond phase-tuned optically heterodyned Kerr gate by which we have measured both the signs and the magnitudes of the real and the imaginary components of (chi) (3). This information is very useful in understanding the roles of one- and two-photon resonances. Another application of fullerenes is in polymeric photorefractivity which is derived from a combination of optically induced space-charge field and the electro-optic effect. Exceptionally rapid progress has been recently witnessed in the development of polymeric photorefractive materials which now exhibit parameters of merit comparable or surpassing best inorganic photorefractives. We have devised polymer composite with C60 as the photosensitizer to produce highly efficient photorefractive materials. The dynamic and the kinetic aspects of the photorefractive process in the polymer composite have been investigated.
The electric field induced dynamic phase-matching of SHG waveguide was first demonstrated using a main chain type NLO polymer. The optimum phase-matching thickness was controlled by applied an electric field to polymer waveguide. The effective phase-matching thickness variation induced by poling is about 0.025 micrometers which is 6 times larger than FWHM of phase-matching thickness in conventional slab waveguide. The efficient phase-matched SHG was observed from taperless slab waveguide. No decay of SH conversion efficiency is observed in the presence of electric field.
300 types of "chalcone" derivatives excellent in blue light region
transparency were synthesized to investigate on second harmonic generation(SHG).
The results of investigation suggested that an alkoxy group, an alkylthio group
and halogen were effective as a substituent. Besides, a single crystal with
respect to 4-ethoxy-4 ' -methoxychalcone(C-607) and 1- (2-thienyl ) -3- (4-
fflethylphenyl)propene-l-one(TC-28) were grown. The obtained crystals were high
quality and large size over 5 cm. We also had the first success in continuous
SHG on a intracavity of the microchip laser using this single crystal "chalcone".