High sensitivity dual core photonic crystal fiber sensor for simultaneous detection of two samples

Abstract

The optical control ability of photonic crystal fiber (PCF) is a distinctive property suitable for improving sensing and plasma performance. This article proposes a dual-core D-channel PCF sensor that can detect two samples simultaneously, which effectively solves the problems of coating difficulty and low wavelength sensitivity. The PCF has four layers of air holes, which dramatically reduces the optical fiber loss and is more conducive to the application of sensors in actual production. In addition, by introducing dual cores on the upper and lower sides of the central air hole, reducing the spacing between the core and the gold nanolayer, a stronger evanescent field can be generated in the cladding air hole. The optical fiber sensor can detect the refractive index of two samples simultaneously with a maximum sensitivity of 21300 nm/RIU. To the best of our knowledge, the sensitivity achieved in this work is the highest sensitivity with the dual sample synchronous detection sensors. The detection range of the refraction index is 1.35-1.41, and the resolution of the sensor is 4.695×10-6. Overall, the sensor will be suitable for medical detection, organic chemical sensing, analyte detection, and other fields.

Design of a photonic crystal fiber polarization beam splitter with simple structure and ultra-wide bandwidth

“…[6][7][8][9] Over the past two decades, photonic crystal fiber (PCFs) have received great attention due to their unique optical characteristics. [10][11][12][13][14] In recent years, some researches have concentrated on the PBSs based on the dual-core PCFs (DC-PCFs). [15,16] In 2019, Chu et al designed a DC-PCF PBS fabricated with Ge 20 Sb 15 Se 65 glass, where the splitting length of 63 µm and working bandwidth of 80 nm are achieved.…”