The mode properties of hollow-core fibers with a cladding formed by a periodic arrangement of dielectric tubes in a triangular lattice for THz applications are numerically investigated. The fiber supports a high number of modes. Effectively single-mode operation can be obtain by reducing the core size, but at the expense of high fundamental mode propagation loss. Single-mode propagation can be obtained by exciting the fiber with a linear polarized gaussian beam with proper spot size.
Single-mode propagation in triangular tube lattice hollow-core terahertz fibers / Vincetti, Luca. - In: OPTICS COMMUNICATIONS. - ISSN 0030-4018. - STAMPA. - 283:(2010), pp. 979-984. [10.1016/j.optcom.2009.11.025]