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

Effects of Triangular Core Rotation of a Hybrid Porous Core Terahertz Waveguide

“…The equation can be expressed in the following manner where, ω=2fπ, and neff =Re(β)c/ω, constant c is the velocity of light [9]. The EML of the fiber can be determined by using the following equation [20];…”

“…J. Liang et al [20] had proposed a THz porous wave guide with a flat dispersion from 0.98 to 1.15 THz frequency range with absolute dispersion variation less than 2.5 (ps/THz/cm). This design reported effective material loss was 0.432 cm -1 .…”

Low-loss rotated porous core hexagonal single-mode fiber in THz regime

“…That is why only the waveguide dispersion is analyzed in this case. Dispersion parameter can be calculated using the following expression [34]:…”

Low Loss Single-Mode Porous-Core Kagome Photonic Crystal Fiber for THz Wave Guidance

“…To damp backscattering at the boundaries of the simulation area, a circular perfectly matched layer (PML) is imposed inside the simulation domain since PML is the most efficient absorption boundary conditions and circular design of PML is defined to improve calculations modes propagation in optical fibers. To estimate EML or absorption loss α eff of the proposed kagome lattice PCF, the following expression is used [20] η α…”

“…The kagome structure is formed by three parallel groups of struts at an angle of 4π /3 radian each [19]. The diameter of the air-hole d c determines the porosity which is defined as the ratio of the area of all the air-holes in the core to the area of the core area covered by p. Topas is used as background material owing to its low bulk material absorption loss of α mat = 0.2cm -1 [14], constant refractive index of n=1.5258 [20], and non-absorbing nature of water vapor [14]. Figure 2 shows the mode field confinement of the proposed kagome lattice PCF for different core porosity at 1 THz.…”