A new photonic crystal fiber biosensor using surface plasmon

A new photonic crystal fiber (PCF) biosensor based on surface plasmon resonance (SPR) phenomenon is proposed. In terms of chemical stability of the active plasmonic material gold (Au) and the sensor layer outside the fiber structure, it is used to simplify the sensor configuration. The proposed sensor can detect unknown analytes flowing on the metal surface or dripping on the outer surface of the metal layer. The proposed sensor consists of symmetrical circular air holes. Two small air holes are used in the second ring. which helps to generate the field and also helps to adjust the phase matching between the guided state of the nucleus and the surface plasmon teppolaritons (SPP). Surface plasmons are excited along the metal surface by the guided mode of the leakage-like Gaussian kernel. The guiding properties and the sensing performance are numerically investigated by the Finite Element Method (FEM). A perfectly matched circular layer is used to absorb the radiation towards the surface. The sensor offers a maximum sensitivity of 1000nm/RIU with a sensor resolution of less than 1×〖10〗 ^(-4) RIU.The proposed sensor design shows promising results that can be used in the detection of biological and biochemical analytes.