Optical Biochemical Sensor Using Photonic Crystal Nano-ring Resonators for the Detection of Protein Concentration

What is it about?

Two-dimensional finite-difference time-domain (2-D FDTD) method is used for simulating the propagation of electromagnetism wave and plane-wave expansion (PWE) approach is applied to analyze the proposed sensor. Biochemical sensor is presented for identifying small changes in the refractive index. The detection of protein concentration from 0% to 35% as one of its applications has been presented. The biochemical sensor structure includes a ring resonator shaped by consecutive curves and two waveguides. By binding protein concentration into the sensing hole, the refractive index of sensing hole is changed and the intensity of the transmission spectrum is shifted to the lower values. The results reveal that the quality factor and the sensitivity of proposed biochemical sensor are respectively obtained about 2960 and 925.02 a.u./RIU.

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