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 paper.
Objective: The aim of this model is to detect formalin at a high level of sensitivity.
Methods: 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 the 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.