Label-free biosensing with high sensitivity in dual-core microstructured polymer optical fibers

Simultaneous measurement of temperature and humidity with microstructured polymer optical fiber Bragg gratings

“…In addition, POFs have a high elastic strain limit with low Young's modulus and are biocompatible, which makes them advantageous for fiber Bragg grating (FBG) based strain and bio-sensing applications [3][4][5][6][7][8] . Some polymers, such as PMMA, are humidity sensitive and strongly absorb water 9 , while other polymers, for instance TOPAS and Zeonex, are insensitive to humidity [10][11][12] .…”

Light propagation mechanism switching in a liquid crystal infiltrated microstructured polymer optical fibre

“…It brings possibility to create a variety of microstructured polymer photonic structures and in particu− lar those with a high index contrast between the core and the cladding. Moreover, due to low Young's modulus and high biocompatibility of the fibre materials, mPOFs can be suc− cessfully used in practical applications including, e.g., strain− [11,12], temperature− [6,11,13,14], pressure− [11,15] and bio−sensing [7,8,[16][17][18][19].…”

High-sensitivity dispersive Mach–Zehnder interferometer based on a dissimilar-doping dual-core fiber for sensing applications

“…These types of fibers were also demonstrated as temperature sensors in 1983 [2]. With the advent of microstructured fibers, several dual-core fibers were developed, such as twin-core fibers with special air cladding [3], based on photonic bandgap fibers [4,5] and polymer fibers [6]. Hybrid dual-core fibers where light is guided by total internal reflection in one core and by bandgap guidance in the other were also proposed for wavelength-selective coupling [7].…”

“…In this case the two cores appear to be suspended in large air holes by thin glass bridges [8]. All these configurations can be used for the measurement of different parameters, such as refractive index [5,9,10] or biosensing [6]. Through the selective infiltration of a single hole with fluid along a dual-core photonic crystal fiber (PCF), a record sensitivity for a fiber device of 30,100 nm per refractive index unit was demonstrated [10].…”

“…However, by designing the fiber to have two different cores, it can be made highly sensitive to these parameters. The design of the fiber also introduces relevant trade-offs: the optical coupling between the two cores can be a limitation when the two cores are close [6]. On the contrary, when the two cores are very distant, coupling light simultaneously from a single-mode fiber (SMF) to the two cores may be challenging.…”