Terahertz multi-metal-wire hybrid-cladding hollow waveguide for refractive index sensing

doi:10.1088/1674-1056/25/2/028703

Abstract We propose a design of terahertz refractive index sensing based on the multi-metal-wire (MMW) hybrid-cladding hollow waveguide. The proposed terahertz hybrid-cladding hollow waveguide comprises one air core in the center surrounding MMW surrounded dielectric. The central air core is used for filling lossless measurands and transmitting terahertz light. In particular, the refractive index sensing is realized by measuring the mode field area (MFA) variation of radially polarized mode. The modal effective refractive index, mode field intensity distribution, and mode field area properties responding to the measurand refractive indexes for different operating frequencies and structure dimensions are investigated, respectively. Simulations show that the proposed terahertz refractive index sensor can realize easily the measurement of the measurand refractive index. Meanwhile, the effects of operating frequency and structure parameters on sensitivity and measurement accuracy are also studied. In view of the trade-off between sensitivity and measurement accuracy, the reasonable choice of the operating frequency and structure parameters can optimize appropriately the sensitivity and measurement accuracy, and the sensitivity can reach approximately 0.585 mm²/RIU (RIU is short for refraction index units) with the proper frequency and structure parameter.

Keywords: terahertz waveguide sensor hybrid-cladding hollow structure

Received: 21 August 2015
Revised: 28 September 2015
Accepted manuscript online:

PACS:	87.50.U-
	42.81.Qb	(Fiber waveguides, couplers, and arrays)
	42.81.Pa	(Sensors, gyros)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51309059).

Corresponding Authors: Ying-Ying Yu
E-mail: yuyingying58@hotmail.com

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Ying-Ying Yu(于莹莹), Xu-You Li(李绪友), Kun-Peng He(何昆鹏), Bo Sun(孙波) Terahertz multi-metal-wire hybrid-cladding hollow waveguide for refractive index sensing 2016 Chin. Phys. B 25 028703

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Terahertz multi-metal-wire hybrid-cladding hollow waveguide for refractive index sensing

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