Optical Gas Sensor Fabrication Based on Porphyrin-Anchored Electrostatic Self-Assembly onto Tapered Optical Fibers

Novel Highly Sensitive Protein Sensors Based on Tapered Optical Fibres Modified with Au-Based Nanocoatings

“…Similarly, the transmission spectrum of the T2 Au NPs sensor was recorded during the LbL film deposition process. The initial LbL steps cause a red wavelength shift due to the deposition of the PAH/SiO 2 NPs bilayers, which is typical behaviour observed during the deposition of thin films onto tapered optical fibres [39]. Similar behaviour was observed during the deposition of the Au NPs (Figure 4(b)).…”

“…A change in the RI of the surrounding medium leads to a modification of the coupling conditions and is accompanied by a modification of the transmission spectrum of the tapered optical fibre sensors. Typically, the changes in both wavelength position of the interference fringes and intensity losses are observed [39]. In general nonadiabatic tapers are used because their abrupt transitions generate a number of modes in the tapered region, and the interference between these modes creates characteristic fringes in the transmission spectrum.…”

Monitoring techniques for the manufacture of tapered optical fibers

“…The light transmitted by a tapered fiber is sensitive to changes in the refractive index of the medium within the vicinity of the taper waist and this feature forms the basis for the use of tapers as interferometric refractometers [5,6]. Tapered optical fibers have been used for a variety of sensing applications; they have been used to monitor in real time the growth of Escherichia coli in an aqueous medium [2], to detect label-free single stranded DNA in real time [7], for Raman spectroscopic sensing [8], and as gas sensors [4]. Tapers have also been used to couple light to a microsphere to allow wavelength-selective fiber lasers [9] to be made for environmental sensing applications.…”

“…Tapered optical fibers have applications in telecommunications as directional couplers [1] and can also be used as sensing devices for a wide range of biomedical and chemical applications [2][3][4]. A tapered fiber is fabricated by locally heating a short section of optical fiber while stretching it.…”

Fibre-Optic Chemical Sensor Approaches Based on Nanoassembled Thin Films: A Challenge to Future Sensor Technology

“…The optical properties of the tapered fibre waveguide are influenced by the profile of the conical tapering sections, by the diameter of the taper waist and by the optical thickness of the surrounding medium. The proportion of the power in the evanescent field, and thus the interaction with the surrounding medium, increases with decreasing diameter of the taper waist [23,24]. In the tapering section, the guided mode of the single mode fibre is converted into a mode of the waist, Figure 2.…”