[10a-Z16-1~9] 4.3 Lasers and laser materials processing

▼ [10a-Z16-6] Fractional optical vortex creates deflected ‘spin-jet’

〇Haruki Kawaguchi¹, Kei Umesato¹, Katsuhiko Miyamoto^1,2, Takashige Omatsu^1,2 (1.Graduate School of Engineering, Chiba Univ., 2.Molecular chirality research center, Chiba Univ)

Keywords:Optical vortex, Laser induced forward transfer, Patterning

Optical vortex carries a ring-shaped intensity profile with a central dark core, and an orbital angular momentum characterized by an integer, termed a topological charge. In recent years, we have discovered that the optical vortex creates a spinning jet of the irradiated high viscosity donor with a straight flight, that is a ‘spin-jet'. Such ‘spin-jet’ provides us an advanced printing technology with high spatial resolution beyond the conventional laser induced forward transfer.
In this presentation, we report on the deflection of the high-viscosity donor (Au micron-scale particles suspension) ‘spin-jet’ by employing the fractional optical vortex with a non-integer topological charge. The fractional optical vortex forced the donor film to generate the deflected ‘spin-jet’ towards the left, manifesting its curved trajectory. Such deflected ‘spin-jet’ will enable the scanning of ‘spin-jet’ without a mechanical system.