Design & Investigation of Different Highly Sensitive PCF Sensors Based on Surface Plasmon Resonance

Abstract

Many Researchers have proposed many designs on SPR based PCF sensors. This field is outgrowing very rapidly due to its label free, real time monitoring detection technique and all other applications. So, sensors with better performance are discovered and on the way to be discovered, The sensitivity and accuracy are quite high in SPR sensors and it has fabrication friendly size. But in case of higher sensitivity, complex structures and fabrication complications arrive. That is why designing a PCF sensor includes some goals & others need to be compromised. Studying many PCF sensors, our design was proposed for an improved sensing performance and detecting magnetic and temperature changes. Also, the target was so that this design can be practically implemented. We proposed a circular lattice structure with gold coating. It was surrounded with a thin PML layer & stack and draw method was adapted for easy fabrication. We optimized various parameters whichever gave the best results. In all cases we used COMSOL Multiphysics 5.3a and Matlab for our researched work. Amplitude Sensitivity (AS) of 7223.62 RIU-1 and wavelength sensitivity (WS) of 28500 RIU-1 was noted. The Sensor resolutions are 1.38×10-6 and 3.50×10-6 RIU for amplitude and wavelength respectively and the sensor has a FOM of 914 with an analyte sensing range from Refractive indices 1.33 to 1.42. Aside from this, the sensor can perform as a temperature sensor with a maximum temperature sensitivity of 1.25 nm/ °C and also as a magnetic field sensor with a maximum sensitivity of 0.16 nm/Oe. Thus, denoting the high sensing capabilities, this proposed sensor can prevail as a potential asset in the bio-detection field.