Abstract
A hexagonal photonic crystal fiber (PCF) sensor with a dual optofluidic channel based on surface plasmon resonance (SPR) effect is proposed. The sensor characteristic is numerically explored by software integrated with the finite element method (FEM). The numerical results show that, when the analyte refractive index (RI) varies from 1.32 to 1.38, high linearity between resonance wavelength and analyte RI is obtained and the value of adjusted R2 is up to 0.9993. Simultaneously, the proposed sensor has maximum wavelength sensitivity (WS) of 5500 nm/RIU and maximum amplitude sensitivity (AS) of 150 RIU−1, with an RI resolution of 1.82 10−5 RIU. Besides, owing to a simple structure and good tolerance of the proposed sensor, it can be easily fabricated by means of existing technology. The proposed sensor suggests promising applications in oil detection, temperature measurement, water quality monitoring, bio-sensing, and food safety.
Highlights
Surface plasmon polariton [1] (SPP) has attracted increasingly more attention recently
Phenomena, in which the sensing Au layer was wrapped outside the photonic crystal fiber (PCF); by using the wavelength interrogation (WI) mode, the designed sensor showed a maximum sensitivity of 14,000 nm/RIU and a resolution of 1 × 10−4 RIU [14]
The proposed PCF-surface plasmon resonance (SPR) sensor operates on the basis of the interaction between evanescent field
Summary
Surface plasmon polariton [1] (SPP) has attracted increasingly more attention recently. Some typical designs are as follows: Dash et al proposed a biosensor based on PCF-SPR that showed refractive index (RI) sensitivity of 2000 nm/RIU with a resolution of 5 × 10−5 RIU [11]. In 2014, Otupiri et al proposed a novel birefringent PCF biosensor constructed on the SPR effect; for spectral interrogation (SI), the sensor resolution values yielded 5 × 10−5 RIU for HEx11 modes and y. In 2016, Rifat et al designed a novel PCF biosensor based on SPR phenomena, in which the sensing Au layer was wrapped outside the PCF; by using the wavelength interrogation (WI) mode, the designed sensor showed a maximum sensitivity of 14,000 nm/RIU and a resolution of 1 × 10−4 RIU [14]. Liu et al proposed a PCF-SPR sensor with two open-ring channels; their sensor showed an average spectral sensitivity of 5500 nm/RIU and a maximum resolution of. The proposed sensor can be fabricated by employing the standard stack and draw PCF fabrication method
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