Abstract
A novel high performance optical fiber refractive index (RI) sensor based on the hybrid transverse magnetic (TM) mode of Tamm plasmon polariton (TPP) and surface plasmon polariton (SPP) is proposed. The structure of the sensor is a multi-mode optical fiber with a one dimensional photonic crystal (1 DPC)/metal multi-films outer coated on its fiber core. A simulation study of the proposed sensor is carried out with the geometrical optical model to investigate the performance of the designed sensor with respect to the center wavelength, bilayer period and the thickness of silver layer. Because the lights transmitted in the fiber sensor have much larger incident angles than those in the prism based sensors, the center wavelength of the 1 DPC should shift to longer wavelength. When the coupling between TM-TPP and SPP is stronger, the sensor exhibits better performance because the electromagnetic field of the TPP-SPP hybrid mode is enhanced more in the analyte. Compared to most conventional fiber surface plasmon resonance sensors, the figure of merit of the proposed sensor is much higher while the sensitivity is comparable. The idea of utilizing TPP-SPP hybrid mode for RI sensing in the solid-core optical fiber structure presented in this paper could contribute to the study of the fiber RI sensor based on TPP.
Highlights
Surface electromagnetic waves, including Bloch surface wave (BSW) excited at the interface between a homogeneous medium and a finite one-dimensional photonic crystal (1 DPC) and surface plasmon polariton (SPP) excited at the interface between metal and dielectric, have been applied to biochemical sensing in recent years [1,2,3,4]
The band gap of transverse magnetic (TM) light with large incident angles near 90 instead of small incident angles is more meaningful to the designed large incident angles near 90◦ instead of small incident angles is more meaningful to the designed fiber fiber sensor
A novel solid-core fiber refractive index (RI) sensor with 1 DPC/Ag structure based on the Tamm plasmon polariton (TPP)-SPP hybrid mode was proposed
Summary
Surface electromagnetic waves, including Bloch surface wave (BSW) excited at the interface between a homogeneous medium and a finite one-dimensional photonic crystal (1 DPC) and surface plasmon polariton (SPP) excited at the interface between metal and dielectric, have been applied to biochemical sensing in recent years [1,2,3,4]. 18, x of 12 rarely extended into the surrounding analyte on the other side of the metal film like BSW and SPP It is TPPtodemonstrates itself as for a narrow resonance dip in the reflectance spectrum of difficult directly utilize. In a 1 DPC terminated by a thin plasmonic metal film, TPP and SPP can be excited simultaneously the surrounding on the Coupling other side of the metalTM-TPP film like at BSW. The electromagnetic field of TPP localizes at the boundary of 1 DPC and metal, while that simultaneously when total internal reflection condition is satisfied. The electromagnetic field of the hybrid mode is enhanced on the metal/analyte interface. TPP-SPP hybrid is no report on the sensing application of TPP-SPP hybrid mode based on solid-core fiber structure. Is much higher.is extended compared that the RI detection rangewhile of thethe designed sensor with optimal parameters with the conventional solid-core fiber SPR sensors, while the figure of merit (FOM) is much higher
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