Terahertz polarization beam splitter with wide bandwidth and low loss

This paper proposes a polarization beam splitter operating at terahertz frequencies. The beam splitter utilizes cyclo-olefin copolymer as the material and introduces two hollow elliptical structures to divide the fiber core into two parts. The characteristics of this fiber are analyzed using the finite element method, and the influence of various structural parameters on the polarization splitting properties is studied in detail. By optimizing the structural parameters of the fiber, a terahertz polarization beam splitter with a bandwidth of 0.08 THz and a low transmission loss of 0.071 dB/cm is achieved at the center frequency of 1 THz with a length of 2.81 cm. This fiber achieves significant breakthroughs in operating bandwidth and transmission loss, making it of great value for the design and research of polarization beam splitters and having important applications in optical communication systems and optical networks.