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This article represents a new structure of octagonal cladding with a rotated-hexa core in photonic crystal fiber (O-PCF) for chemical sensing application in the terahertz (THz) waveguide. The five layers octagonal shape in circular air holes of cladding region with two layers rotated-hexa shape in circular air holes of core area are proposed in this study. The mathematical analysis is achieved from the technique of perfectly matched layers (PML) boundary condition with a finite element method (FEM) at the terahertz (THz) wave propagation. After the simulation process, the designed O-PCF sensor performs the extreme relative sensitivity at 77.14%, 78.06% and 76.11% at 1 THz for three chemicals such as Ethanol ( n = 1.354), Benzene ( n = 1.366) and Water ( n = 1.330). Alternatively, the low confinement losses are 2.26 × 10−03 dB/m, 3.02 × 10−06 dB/m and 2.72 × 10−02 dB/m for similar three chemicals at 1 THz. The effective area, effective mode index and total power fraction are also concisely explained here. Furthermore, we hope that the suggested excellent designed of octagonal photonic crystal fiber (O-PCF) can be utilized particularly for chemical sensing in material study, industrial areas, nano-optics, biomedical and others communication areas in THz technology.
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