Abstract
A surface plasmon-based hexagonal photonic crystal fiber sensor is numerically computed and studied covering a large span of analyte refractive index from 1.33 to 1.40. Structural design parameters are optimized to improve the sensor performance. Investigation of sensor sensitivity has been performed by analyzing the electromagnetic behavior of light using finite element method-based mode solver. The studied sensor yields the maximum amplitude sensitivity of 3958.84 RIU − 1 at analyte RI of 1.39 and moderate wavelength sensitivity of 8000 nm RIU − 1 at analyte RI of 1.40. The observed results are also presented by changing the gold layer thickness, lattice period, and air hole diameter. The reported plasmonic sensor is an appealing aspirant in the field of biochemical sensing, biomolecule detection, and biological sample recognition.
Highlights
Sensors are essential devices that detect the component amount of an estimation article and convert this amount into a readable signal, which is shown on an instrument
Surface plasmon resonance (SPR) based optical fiber sensors have become the primary technique in optical sensing technique (OST).3
Due to simple structure of proposed sensor, this can be manufactured by conventional stack and draw technique,29 and chemical vapor deposition method is suitable for making a gold metal layer with thickness of Tg = 30nm
Summary
Sensors are essential devices that detect the component amount of an estimation article and convert this amount into a readable signal, which is shown on an instrument. Hossain et al presented a hexagonal PCF biosensor utilized an external sensing approach This silver coated PCF ensures the wavelength sensitivity of 21000 nm/RIU with amplitude sensitivity of 2456 /RIU. Shakib et al demonstrated a novel structure of PCF biosensor to acquire the wavelength sensitivity in value of 16000 nm/RIU and amplitude sensitivity of 780 RIU-1 In this model, outer ring air holes are cut to make slots, which are difficult to fabricate. Shafkat proposed a PCF sensor to display the wavelength sensitivity of 10,700 nm/RIU with a suitable amplitude sensitivity of 1770 RIU-1 This gold-coated duplex-core model has fewer air holes of different diameters, which increases the fabrication complexity.. S. Chakma et al displayed a gold-deposited PCF-SPR biosensor and presents a wavelength sensitivity of 9000 nm/RIU and high resolution with amplitude sensitivity of 318 RIU-1 .25. Optimized sensor performance and effects of design parameters on sensitivity is analyzed in third section followed by conclusion
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