Presentation Information
[7a-N204-3]Optical vortex lattices induced light-matter interaction
〇(PC)Soki Hirayama1, Yohei Kawano1,2, A. Srinivasa Rao1, Takashige Omatsu1 (1.MCRC, Chiba Univ., 2.HSG K.K.)
Keywords:
optical vortex,azo-polymer,spin-orbit angular momentum coupling
Circularly polarized optical vortex lattices exhibit unique wavefront and polarization structures via spin–orbit angular momentum couplings, thereby yielding exotic light–matter interactions. In this study, we report on the first demonstration of optical vortex lattices induced light–matter interaction in an azo-polymer, which is a photosensitive functional material. A circularly polarized optical vortex lattices with hexagonal close-packed vortices generated using a spatial light modulator and a quarter wave plate was focused onto an azo-polymer film, so as to form a surface relief structure. Hexagonal close-packed protrusions were formed at the dark spots of the illuminated optical vortex lattices, arising from the photo-induced mass transport. When an orbital angular momentum (OAM) and a spin angular momentum (SAM) had the same sign, the protrusions with relatively low height appeared to be interconnected. In contrast, when OAM had the opposite sign of SAM, the tall protrusions were formed independently. These results manifest the constructive/destructive coupling effects of the OAM and SAM of optical vortex lattices.