Abstract
A polymer fiber with a suspended hollow core is proposed as a low-loss terahertz (THz) waveguide. THz guiding mode is formed due to the suspended hollow core and the air inside the suspended hollow core fiber (SHCF). The low-loss property of the SHCF is achieved due to the fact that the air part of the suspended hollow core traps a large portion of mode power of the THz wave. By using a finite-element method, both the SHCF and the suspended solid core fiber (SSCF) are comparatively investigated. The effective indices, mode area, power fraction, relative absorption loss, and mode profile of the SHCF and the SSCF are presented. Simulation results show that the proposed SHCF exhibits better loss property than the SSCF.
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