Broadband, low-loss, dispersion flattened porous-core photonic bandgap fiber for terahertz (THz)-wave propagation

By intentionally combining the porous fiber and the air-core photonic bandgap fiber, a kind of porous-core photonic bandgap fiber for guiding terahertz (THz) wave is proposed in this paper. THz wave in a frequency range from 0.98 THz to 1.15 THz can be well concentrated in the fiber core region with a low loss. Compared with the air-core photonic bandgap fiber, this kind of fiber can also provide a broader bandwidth and a much more flattened dispersion. Numerical simulations are performed by the plane wave expansion method and the finite element method.