Abstract
A high-performance Bloch surface wave (BSW) sensor based on the hollow fiber (HF) inner coated with the one-dimensional photonic crystal (1DPC) consisting of TiO2 and SiO2 bilayers is proposed. Performances including sensitivity and figure of merit (FOM) of the sensor are investigated theoretically with the ray transmission model. Several structure parameters such as the center wavelength of 1DPC, the thickness of the cap layer and the bilayer period are optimized to obtain a best performance of the sensor. The results show that the proposed sensor has an ultra-high FOM over 1100 RIU <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> , which is approximately two and one orders of magnitude higher than that of the HF surface plasmon resonance (SPR) sensor and HF long-range SPR sensor, respectively. Moreover, the proposed sensor has a much broader practical RI detection range, which makes it more useful in sensing applications. The performance of the proposed sensor applicated in temperature sensing is also estimated to prove its application potential.
Highlights
Surface electromagnetic wave is a kind of electromagnetic mode confined at the surface of a medium
For the TM light, the gradually attenuated oscillating electric filed in 1DPC and the enhancement at the cap layer shown in Fig 2(b) indicate that the dip at 584 nm which locates in the photonics bandgap (PBG) is caused by the excitation of the Bloch surface wave (BSW)
The dip at 802 nm is caused by the waveguide mode (WG) which could distinguished by its oscillating electric filed in 1DPC
Summary
Surface electromagnetic wave is a kind of electromagnetic mode confined at the surface of a medium. To avoid the bulky disadvantage caused by the prism, many kinds of optical fiber sensors characterized by miniaturization, low cost and high sensitivity were studied in recent years [18], [19]. Among these fibers with various structures, the hollow fiber (HF) which consists of a supporting tube with metallic and dielectric films coated on its inner surface and a hollow core has been applied for sensing due to its unique advantages [20], [21]. The performance of the proposed sensor in temperature sensing is briefly estimated to indicate its application potential
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