title: Terahertz polarization splitter based on a dual-elliptical-core polymer fiber.
abstract: A terahertz polarization splitter based on a dual-elliptical-core polymer fiber is proposed and theoretically optimized. Dual-elliptical cores with subwavelength-scale diameters are independently suspended within a fiber, which not only support two orthogonal polarization modes, being single-mode guided with low absorption losses, but also allow them to switch from one core to the other, with different coupling lengths. As a consequence, the two polarizations can be easily separated by choosing a suitable transmission length at a desired operation frequency. The transmission modes, coupling lengths for x- and y-polarizations, as well as the performance of the proposed polarization splitter at a center-frequency of 0.6 THz are investigated and numerically analyzed. A 1.43 cm long splitter with an ultralow loss of 0.4 dB, a high extinction ratio better than -10  dB and a bandwidth of 0.02 THz is achieved.
authors.forename: Hongzhi
authors.initials: H
authors.lastname: Chen
authors.forename: Guofeng
authors.initials: G
authors.lastname: Yan
authors.forename: Erik
authors.initials: E
authors.lastname: Forsberg
authors.forename: Sailing
authors.initials: S
authors.lastname: He