Figure 2: POCKET immunoassay (with detector)
A photograph of the complete device (top left), close up of the fluidic microchip(top right) and a functional diagram of the detector (bottom) The use of microchannels ensures that the chip is compact and uses small amounts of reagents. Silver reduction in the sample creates an opaque surface that impedes transmission of the signal from the laser diode to the optical detector and amplifier, thus resulting in a lower received signal. Cost of all components is less than $45 US.