Designing Sensor based Surface Plasmon Resonance with Photonic Crystals

In this paper, surface Plasmon sensor was designed by using structures of two-dimensional photonic crystal. This structure is a hexagonal arrange that on each side located 7 circular holes.  The circular holes made of air that have been arranged in silicon background and the holes have been arranged a triangular arrangement. The new arrangement makes with defects in the structure center and added new silver bar. Using of the finite difference time domain (FDTD) simulation method on this structure were calculated the propagation loss per wavelength. By changing the refractive index in sensitive area, resonance will happen in the wavelength. By changing the refractive index in sensitive are, the wavelength that resonance happens in it, will change and shift. This feature makes the structure ready to use by sensor. This sensor, depending on the type of sensitive material can be used in different systems and wide range. For examples: environment monitoring, liquid and gas detection and also medical diagnostics.