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. Author manuscript; available in PMC: 2019 Feb 15.
Published in final edited form as: IEEE Sens J. 2017 Nov 24;18(4):1464–1473. doi: 10.1109/JSEN.2017.2777529

Fig. 1.

Fig. 1

(a) Schematic of the photonic crystal (PC) structure, composed of a high refractive index (RI) TiO2 layer and low RI SiO2 layer on a silicon substrate. (b) A 2 mm × 8 mm PC with some visible protein spots on a penny for size comparison. (c) Photo of the PC-integrated single- (left) and four-channel (right) cartridges, with food coloring to indicate sample flow channel. Sample is introduced through the sample inlet holes, outlined in red. In the four-channel cartridge, the center hole (purple) serves as the common inlet for reagents once connected to the automated flow system. Scale bar = 10 mm. (d) Exploded view of the four-channel microfluidic cartridge. Clear = acrylic, Blue = double-sided adhesive (DSA) layers (thickness = 150 μm), Orange = 2 mm × 8 mm × 725 μm PC, Gray = glass coverslip. (e) Schematic view of assembled four-channel cartridge.