Optical microfiber sensor for detection of Ni²⁺ ions based on ion imprinting technology

Abstract

A microfiber sensor detecting Ni2+ based on ion imprinting technology was fabricated and the sensor possessed high sensitivity, a low limit of detection and good regeneration.

Novel optical fiber Vernier immunosensor based on cascading Sagnac loops embedded with excessively tilted fiber grating for specific detection of canine distemper virus

“…Label-free optical fiber biosensors responding to minute changes of surrounding refractive index (RI) have been attracting continuous attention in biomedical/ chemical engineering, environmental monitoring and food safety owing to the unparalleled advantages of compact size, highly electromagnetic immunity, fast response, easy implementation as well as low cost [5][6][7][8]. Various types of optical fiber RI sensors including microfibers [9][10][11], multimode fibers [12,13], photonic crystal fibers [14], fiber gratings [15][16][17][18] have been proposed, among them, excessively tilted fiber gratings (ExTFGs) have been proved to be a promising candidate for monitoring tiny biomolecule solution samples due to the relatively higher RI sensitivity, much lower temperature crosstalk and higher stability as compared with etched fiber Bragg gratings (FBGs) and long period fiber gratings (LPFGs) [19,20]. Luo [21] developed a novel immunosensor to detect Newcastle disease virus (NDV) based on ExTFG coated with gold nanospheres (AuNs).…”