How is the FD device design used?
The FD device can be thought of as two separate M designs on a single chip. This allows the possibility of a ratiometric measurement, that is, the response of one region of interdigitation relative to the other. The FD device may also be prepared with two entirely different polymer films or biological molecules (enzymes, DNA, etc) on each of the two regions of interdigitation. In this way the FD might be used to measure two distinct analytes in the same test medium.
