Figure 1.

Microchannels fabrication in PMMA sheets and optimization using CO₂ laser. Cross‐sectional scanning electron microscopy (SEM) image of the microchannel fabricated using a) a power of 10% and speed of 8%, b) a power of 10% and speed of 6%, c) a power of 10% and speed of 4%. The width of the microchannel is shown to be dependent on the laser speed. SEM image of the sidewall of the microchannel d) of (a), e) of (b), and f) of (c). Surface roughness using a profilometer of the sidewall of the microchannel g) of (a), h) of (b), and i) of (c).