Methods for manufacturing a microfluidic rotor device

Described herein are various embodiments directed to rotor devices, methods, and systems. Embodiments of rotors disclosed herein may be used to characterize one or more analytes of a fluid. A manufacturing method may include bonding a first layer and a second layer using two-shot injection molding. The first layer coupled to the second layer collectively defines a set of wells or cuvettes. The first layer is substantially transparent. The second layer defines a channel. The second layer is substantially absorbent to infrared radiation and may comprise some amount of carbon black or of a laser absorbing dye. A third layer is bonded to the second layer using infrared radiation, e.g. using a near-infrared radiation at a wavelength of about 940 nm. The third layer defines an opening configured to receive a fluid and is substantially transparent. The channel establishes a fluid communication path between the opening and the set of wells. By combining injection molding and laser welding techniques, the method may lead to a reduced risk of contamination by limiting the formation of dust within a well during manufacturing of a rotor device.