Design of a nanoscale gold-coated photonic crystal fiber biosensor

Frontiers in Physics

Physics

Sanchita Sarker¹  Filip Studnička²  Dhasarathan Vigneswaran³ 

[1] Department of Electronics and Telecommunication Engineering (ETE), Rajshahi University of Engineering and Technology (RUET), Rajshahi, Bangladesh;Department of Physics, Faculty of Science, University of Hradec Králové, Hradec Králové, Czechia;Department of Physics, Faculty of Science, University of Hradec Králové, Hradec Králové, Czechia;Department of Applied Cybernetics, Faculty of Science, University of Hradec Králové, Hradec Králové, Czechia;

关键词: surface plasmon resonance;    photonic crystal fiber;    sensitivity;    photonic biosensor;    amplitude sensitivity;    sensor resolution;   

DOI  :  10.3389/fphy.2023.1164255

 received in 2023-02-12, accepted in 2023-04-14,  发布年份 2023

来源: Frontiers

【 摘 要 】

A simple two-layer refractive index sensor based on surface plasmon resonance has been proposed in this work, which evinces high sensitivity for detecting unknown analytes. This sensor design includes hexagonal- and octagonal-shaped air-hole rings, which have been introduced in the first and second layers, respectively. By performing this amalgamation of different types of air holes, this gold-coated plasmonic sensing scheme provides the broad sensing limit of the analyte, which is 1.32–1.40. The sensing performance has been examined by applying the finite element method, which is being used for modeling complex and irregular-shaped geometry. The wavelength interrogation method has demonstrated a maximal wavelength sensitivity of 9,000 nm/RIU (refractive index unit). The maximal amplitude sensitivity of 1902 RIU−1 has been exhibited in the y-polarized mode using the amplitude interrogation method. Moreover, the maximal sensor resolution of 1.11 × 10−5 RIU covers the entire sensing range. Furthermore, by adjusting the air-hole diameter, pitch, and depth of the gold layer coating, many more investigations have been demonstrated in this design. This highly sensitive sensor is very convincing to be used in many applications like chemical, biological, and also in physical sensing analyses.

【 授权许可】

Unknown   
Copyright © 2023 Sarker, Vigneswaran and Studnička.