2.2. Rotor and optical systems for the centrifugal
microfluidic disc
The rotor system and its operating software were purchased from Hanra
Precision Engineering (Incheon, Korea) and modified by our lab. The
system was composed of an 808 nm laser diode (TTG50TEC, Laser Solution
Korea, Ansan, Korea) for the ferrowax microvalve operation, a camera
(BFS-U3-16S2C-CS, FLIR Systems, Inc., Boston, MA, USA), and stroboscopic
lights (BUB 0641 (G), PerkinElmer, Inc., Waltham, MA, USA) for the
imaging of the disc. The laser module was automatically controlled by a
one-dimensional step motor (EzM-42S-A, Fastech, Bucheon, Korea), and a
polar coordinate system was used to precisely control the laser
irradiation position on the disc based on the rotational angle and
radial distance from the edge. A rotary servo motor (SGM7J-02A, Yaskawa
Electric Corp., Kitakyushu, Japan) was used to rotate the disc. Home and
trigger sensors (EE-SX671A, Omron Corp., Kyoto, Japan) were used to
accurately adjust the rotational position. A detailed illustration of
the rotor system is provided in Figure S2.