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Research on the transmission characteristics of open-structure terahertz hollow-core bent fibers
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DOI：10.1117/1.OE.65.4.046104.png)
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Abstract
En 中文
This paper proposes an anti-resonant hollow-core terahertz fiber with an eight-set, three-layer nested circular tube structure. The bending characteristics of the fiber are studied using the finite element method. By selectively removing certain nested tubes and the cladding on the side opposite to the bending direction, an open structure is constructed. By comparing the transmission characteristics of the open structure and the closed structure under bending conditions, the study demonstrates that the proposed open-structure design enables stable terahertz wave transmission under appropriate bending radius while exhibiting lower bending loss, with a minimum value of 0.031 dB/m. Moreover, the open-structure fiber shows improved single-mode transmission performance. Compared with conventional closed-structure terahertz fibers, the proposed open-structure fiber allows external substances to directly access the sensing region from the side, thereby facilitating analyte infiltration and improving practical applicability. Meanwhile, the proposed structure can still provide satisfactory sensing performance, with a maximum relative sensitivity of 99.98%. The practical feasibility of this hollow-core anti-resonant fiber is supported by its compatibility with existing fabrication techniques.
Keywords:
open structure
terahertz sensing
anti-resonant fiber
transmission characteristics.
Journal
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1.2
Papers:
178
Citations:
1.1W
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