Proposal for a symmetrical petal core terahertz waveguide for terahertz wave guidance

Abstract

Countering the terahertz wave applications ‘inefficient transmission’ calls for rapid development in terahertz waveguides that could simultaneously minimize confinement loss, chromatic dispersion and maximize the fraction of power. Here, a new kind of symmetrical petal hollow core terahertz waveguide based on cyclic olefin homopolymer is proposed to achieve low confinement loss, low chromatic dispersion and a high fraction of power. In this designed waveguide, a symmetrical petal-shaped air hole is treated as the core and circular air holes arranged as sunflower-type are inserted in the cladding. The guiding characteristics of the designed waveguide are simulated and analyzed based on the finite element method with perfectly matched layer boundary condition. Based on the optimum structure parameters, it exhibits a minimum confinement loss of 0.0089 dB cm−1 at 2.58 THz and a < 0.07 dB cm−1 bandwidth spanning across 2.51–2.71 THz. Furthermore, in the same frequency region, the high core power fraction is above 93%, and the group velocity dispersion values are lower than 0.6 ps/THz/cm.

Novel double negative curvature elliptical aperture core fiber for terahertz wave transmission

“…denotes the electric field intensity [34]. From figure 5, the effective area A eff with a/b = 1.9 has obvious oscillation trend in the 1.0-1.3 THz region and 1.84-2.5 THz region.…”

“…Next, the effective mode field area A eff is analyzed. The A eff represents the actual mode field distribution during the fiber mode transmission [33], which can be expressed by equation ( 4) [34]:…”

Study on the high birefringence and low confinement loss terahertz fiber based on the combination of double negative curvature and nested claddings

“…Finally, the effective mode field area is analyzed. The effective mode field area A eff of the fiber can be defined as the area covered by terahertz waves inside the core region of the fiber, which can be calculated by the following equation [32]:…”

Terahertz fiber with multi-concentric ring cores for OAM modes propagation

“…flattened) dispersion curve through the operating frequency range is required to maintain uniform response in optical fiber communication with high speed and large bandwidth. The dispersion is composed of two components including material dispersion and waveguide dispersion, since the host material of AA-MOMRF is TOPAS, its nearly constant refractive index is beneficial for negligible material dispersion, the dispersion of the proposed fiber is determined by waveguide dispersion β 2 which can be described as [38]:…”