A ferroelectric polyvinylidene fluoride-coated porous fiber based surface-plasmon-resonance-like gas sensor in the terahertz region

Abstract

In this paper, a ferroelectric polyvinylidene fluoride (PVDF)-coated porous polymer fiber based surface plasmon resonance (SPR)-like gas sensor is proposed theoretically in the terahertz (THz) region based on the total internal reflection (TIR). In such a sensor, the phase matching is achieved by changing the fiber parameters and the plasmon-like phenomenon at the interface between the ferroelectric polyvinylidene fluoride (PVDF) layer and the gaseous analyte is discussed. Using a fullvector finite-element method, the core-mode loss of the fiber is calculated to measure the resolution of the sensor. The amplitude resolution is demonstrated to be as low as 1.45 × 10⁻⁴ RIU, and the spectral resolution is 1.30 × 10⁻⁴ RIU in THz region, where RIU means the refractive index unit.

Keywords

Surface Plasmon Resonance / Total Internal Reflection / Effective Refractive Index / Surface Plasmon Resonance Sensor / Refractive Index Unit

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This work has been supported by the Major State Basic Research Development Program of China (Nos.2010CB327801 and 2007CB310403).