[24a-E106-1~11] 3.7 Laser processing

[24a-E106-9] Direct imprint of helical structures in a biocompatible polymer

〇Ryoga Koike¹, Sadahiro Takahashi¹, Kouhei Toyoda^1,2, Katsuhiko Miyamoto^1,2, Takashige Omatsu^1,2 (1.Chiba Univ., 2.Chiba Univ. MCRC)

Keywords:optical vortex, hydrogel, soft material

We report that the spiral wavefronts of optical vortices were recorded via photoreduction of gold ions when optical vortices were irradiated on hydrogel, a biocompatible polymer doped with gold ions. Gold was precipitated by a picosecond pulsed laser with a wavelength of 532 nm, which was converted into an optical vortex. When the deposited gold was irradiated with a Gaussian beam, it was converted into a circular spatial mode. It was found that this circular spatial mode had a spiral wavefront of the same order as the orbital momentum of the optical vortex irradiated for photo-reduction.