Introduction: Ongoing amelioration of semiconductor nano-crystal in chemical sensing applications has led the Photonic
Crystal Fiber (PCF) as the most appropriate candidate for chemical sensing. A PCF based sensor model has been proposed in this
Objective: The aim of this model is to detect formalin at a high level of sensitivity.
Method: This sensor model has been designed and simulated in COMSOL MULTIPHYSICS to analyze the sensing performance
based on the optical parameters such as relative sensitivity, confinement loss, and effective material loss. Formalin solution is placed
into the core and then the simulation is performed in THz regime ranging from 1 to 2 THz to carry out the optical properties. Simulation data collected from COMSOL are used in Matlab to carry out the graphical representation of the optical parameters.
Results: Simulation results demonstrate that the sensor model inherits high relative sensitivity of approximately 77.71 % at 1.8 THz.
In addition to that, the proposed sensor exhibits zero confinement loss above 1.3 THz and very low effective material loss in the THz
regime for the optimum model.
Conclusion: All the optical parameters maintain standard and desirable values in the THz regime. Besides, the flexible fabrication of
the proposed model is feasible using existing fabrication methods. Simulation results validate the high performance of this proposed
model in formalin detection.