ackground: This manuscript shows a new structure of photonic crystal fiber (PCF). Here,
the finite element method has been used to simulated the conditions that the modes of the
PCF which have continuously modifiable sensing properties by filling with nematic liquid
crystal (LC). In this study, software of COMSOL and MATLAB has been to simulation and
calculation of the parameters of PCF under THZ wave band from 0.1 THZ to 10 THZ
