Fix-Wavelength Multi-Analyte Detection with Serial SOI Ring Resonators

We present a method for the read-out of five serially arranged SOI ring resonator-based biosensors at a speed of 3 Hz/sensor and a fixed wavelength of 1550 nm. The system uses the high thermo-optical coefficient of silicon by applying AC voltages to periodically heat up electrodes adjacent to each sensor. A time-division multiplex scheme allows the allocation of the measured optical output from the mutual spectrum to each specific resonator. We demonstrate our system by immobilizing two different antibodies (biotin and a hexa-His-peptide) at the surface of selected resonators and successfully showing the selective binding characteristics of analyte probing in a microfluidics supported experiments.

Design of FIR Digital Filter Based on CSD Code

A high precision FIR digital filter is achieved based on CSD code. The characteristic of CSD coding is described and the structure of the FIR filter based on time division multiplex is given. FIR filter coefficients is generated by fadtool of MATLAB . The digital filter module is designed by Verilog HDL and simulated under QUARTUS II and MATLAB environment. The results show that the design can improve the accuracy of data acquisition significantly and reduce the use of FPGA resource.