Patent ID: 8652419

Claim:
A method of manufacturing a microfluidic chip, comprising: irradiating, with a laser light, an area to be provided with a valley for storing a fluid on a surface of a substrate so as to form a modified region having a periodic pattern formed in a self-organizing manner in a light-collecting area of the laser light, the laser light having a pulse width for which the pulse duration is on the order of picoseconds or less; carrying out an etching treatment on the substrate in which the modified region is formed, removing at least some of the modified portion so as to provide the valley, and forming a periodic structure having a plurality of groove portions along one direction which have a surface profile based on the periodic pattern on at least a bottom surface of the valley; and forming a metal layer that covers the periodic structure of the bottom surface, wherein the irradiating step further comprises: using linear polarized laser as the laser light; and scanning the light-collecting area of the laser light while controlling the polarized wave direction of the linear polarized laser so that an angle between the scanning direction of the laser light and the polarized wave direction is constant.