Dispersion flattened extremely high-birefringent kagome lattice elliptic core photonic crystal fiber in THz regime

摘要

A highly birefringent elliptic porous-core photonic crystal fiber with kagome lattice cladding has been presented for terahertz (THz) wave transmission. The slotted airholes inside the elliptic core effectively disrupt the symmetry of the porous-core which offers extremely high modal birefringence whereas the kagome cladding structure results in significantly low effective material loss (EML). The birefringence of the proposed structure is 9.73x10-2 and the EML is 0.056 cm-1 for y-polarized mode at an operating frequency of 1THz. The suggested structure also provides very flat dispersion over a bandwidth of 300GHz. It is highly expected that this elliptic core waveguide would be remarkably useful in numerous polarization maintaining THz applications.