The 81st JSAP Autumn Meeting, 2020

Presentation information

Oral presentation

4 JSAP-OSA Joint Symposia 2020 » 4.3 Lasers and laser materials processing

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

Thu. Sep 10, 2020 9:00 AM - 12:00 PM Z16

Masaaki Sakakura(MSR Cambridge)

9:45 AM - 10:00 AM

[10a-Z16-3] Laser Engraved Microstructure for Arranging Particle Flowing in a Glass Microfluidic Channel

Tianlong Zhang1, Yalikun Yaxiaer1, Kazunori Okano1, Yo Tanaka3, Ming Li2, Yoichiroh Hosokawa1 (1.Div. Mat. Sci., NAIST, 2.Macquarie Uni., 3.RIKEN BDR)

Keywords:femtosecond laser, microfluidics, focusing

Control over the positions of particles into a focused stream serves as a prerequisite step for the downstream processing, such as detection, imaging and separation in microfluidics [1]. In this study, we demonstrate the focusing of polystyrene (PS) particles in a microfluidic channel with a glass surficial pattern achieved by femtosecond pulse (fs) laser micromachining (Fig. 1). The fs laser micromachining shows advantages over other methods such as wet etching and deep reactive ion etching (DRIE) for small area direct writing in glasses. Results showed 10-µm PS particles with flow velocity ranging from 600 to 1000 µm/s are able to be driven close to channel center by the pattern induced hydrodynamic forces. Our results hold potential in the development of innovative microfluidic devices requiring the low-speed particle alignment, e.g. contact imaging and fluorescence lifetime-resolved imaging, for wider applications in biology and biomedicine.