Theoretical study of photo-functions of polymer system with nanoscale polarization orientational structure

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In the first half of the project, we have investigated novel photo-functions arising from nanoscale polarization orientational structure, considering mainly the following two kind of systems.1.We theoretically study linear and nonlinear optical responses of a thin film that consists of linear chains confining spiral-type Frenkel excitons. The peculiarities of this system appear in various properties such as the selection rule of optical transitions, complex modes structure of exciton-radiation coupled system, and polarization characteristics of the nonlinear signal. These results indicate that the nanoscale orientation structure of polarizations can be a significant degree of freedom to design novel photo-functions.2.Considering the circular polarization structure seen in the molecular systems of photosynthesis center, we investigated the optical properties of assembly of the ring type molecules. As a result, we have revealed that the energy transfer probability when the nonradiative m … More odes are excited with the evanescent field is much larger than that when the radiative modes are excited. This shows the great possibilities of this system as novel photo-functional materials.In the last half, we theoretically studied the characteristic properties of the optically induced force (OIF) between two semiconductor nano-particles (SNPs) irradiated by an electronic resonant light, assuming that they are floating in the fluid medium. As a result, we have revealed that the bonding state (BS) and the antibonding state (AS) in the polaritonic molecule (PM) can be excited if two SNPs exist near each other. Each state is selectively excited by an incident light with a particular polarization. The attractive OIF arises when BS is excited, while the repulsive OIF arises when AS is excited. This finding will open the way to mechanically control the collective motion of assembly of SNPs manipulating the nanoscale spatial structures of the radiation field through the resonant excitation. Less