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Design and numerical analysis of a photonic crystal fiber (PCF)-based flattened dispersion THz waveguide
Optical Review  (IF0.89),  Pub Date : 2021-08-25, DOI: 10.1007/s10043-021-00698-w
Jibon, Rayhan Habib, Bulbul, Abdullah Al-Mamun, Nahid, Abdullah-Al, Faragallah, Osama S., Baz, Mohammed, Eid, Mahmoud M. A., Rashed, Ahmed Nabih Zaki

We present the modeling of a porous core dispersion flatten photonic crystal fiber (PCF) for the fruitful transmission of THz signals. The model comprises only rectangular holes in both core and cladding areas. The model is numerically studied through simulation employing the finite element method (FEM)-based software. Simulation results disclose an insignificant amount of confinement loss (CL) of 8.01 × 10–5 cm−1 at 1.1 THz in the x-polarization mode. Besides, the effective material loss (EML) is only 2.2 × 10–3 cm−1 at the point. These values ensure a negligible amount of losses present at the modeled waveguide. The model offers a high numerical aperture. The power fraction for this model is 45% in the x-polarization mode at 1.1 THz. One of the splendid properties of the presented model is the ultra-flatten dispersion of approximately ± 0.004 ps/THz/cm, which ensures an insignificant amount of pulse broadening while applying this model in communication fields. The simple structure involving rectangles as well as desired values for optical parameters enhance the fruitfulness and fabrication feasibility of the presented THz waveguide. Thereby, the proposed sensor offers compound features, for instance, low CL, low EML, high NA, high power fraction, and flatten dispersion simultaneously.