Microfiber With Methyl Blue-Functionalized Reduced Graphene Oxide and Violet Light Sensing

In this review paper some recent advances on optical sensors based on photonic crystal fibres are reported. The different strategies successfully applied in order to obtain feasible and reliable monitoring systems in several application fields, including medicine, biology, environment sustainability, communications systems are highlighted. Emphasis is given to the exploitation of integrated systems and/or single elements based on photonic crystal fibers employing Bragg gratings (FBGs), long period gratings (LPGs), interferometers, plasmon propagation, off-set spliced fibers, evanescent field and hollow core geometries. Examples of recent optical fiber sensors for the measurement of strain, temperature, displacement, air flow, pressure, liquid-level, magnetic field, and hydrocarbon detection are briefly described.

Section: Coated Pcf Sensorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advances on Photonic Crystal Fiber Sensors and Applications

Portosi

Laneve

Falconi

et al. 2019

“…For example, in 2014, by using a graphene-coated MNF multimode interferometer for gas sensing, Yao et al realized sensitivities up to ~0.1 ppm for NH 3 gas detection and ~0.2 ppm for H 2 O vapor detection [ 164 ]. In 2016, based on a graphene oxide coated MNF knot resonator, Yu et al demonstrated a sensitivities of ~0.35 pm/ppm for NH 3 and ~0.17 pm/ppm for CO detection [ 167 ] Meanwhile, using hybrid graphene-MNF structures for current [ 168 ], temperature [ 169 ] UV light [ 170 ] and DNA [ 171 ] sensing have also been reported by other groups.…”

Section: Mnf Optical Sensorsmentioning

confidence: 99%

Micro/Nanofibre Optical Sensors: Challenges and Prospects

Tong

2018

115

Micro/nanofibres (MNFs) are optical fibres with diameters close to or below the vacuum wavelength of visible or near-infrared light. Due to its wavelength- or sub-wavelength scale diameter and relatively large index contrast between the core and cladding, an MNF can offer engineerable waveguiding properties including optical confinement, fractional evanescent fields and surface intensity, which is very attractive to optical sensing on the micro and nanometer scale. In particular, the waveguided low-loss tightly confined large fractional evanescent fields, enabled by atomic level surface roughness and extraordinary geometric and material uniformity in a glass MNF, is one of its most prominent merits in realizing optical sensing with high sensitivity and great versatility. Meanwhile, the mesoporous matrix and small diameter of a polymer MNF, make it an excellent host fibre for functional materials for fast-response optical sensing. In this tutorial, we first introduce the basics of MNF optics and MNF optical sensors, and review the progress and current status of this field. Then, we discuss challenges and prospects of MNF sensors to some extent, with several clues for future studies. Finally, we conclude with a brief outlook for MNF optical sensors.

“…Fast response all-fibre graphene assisted temperature sensors have been obtained using microfibre [ 122 ] and side-polished [ 123 ] optical fibre structures with sensitivities of 0.134 dB/°C and 0.1018 dB/°C respectively for a wide range of temperatures. The fabrication of UV light exposure sensors has been explored by means of the utilization of highly birefringent fibre covered with graphene oxide (GO) [ 124 ] and tapered SMF microfibres in contact with methylene-blue functionalized reduced graphene oxide (MB-rGO) [ 125 ]. Light intensity modulation of rGO at high relativity humidity range (70%–95%) was also studied in [ 126 ] using side-polished single mode fibres (SMF) obtaining a sensitivity of 0.31 dB/%RH and a response time faster than 0.13% RH/s.…”

Section: Optical Fibre Sensors Using Graphene-based Materialsmentioning

confidence: 99%

Optical Fibre Sensors Using Graphene-Based Materials: A Review

Hernáez

Zamarreño

Melendi-Espina

et al. 2017

108

Graphene and its derivatives have become the most explored materials since Novoselov and Geim (Nobel Prize winners for Physics in 2010) achieved its isolation in 2004. The exceptional properties of graphene have attracted the attention of the scientific community from different research fields, generating high impact not only in scientific journals, but also in general-interest newspapers. Optical fibre sensing is one of the many fields that can benefit from the use of these new materials, combining the amazing morphological, chemical, optical and electrical features of graphene with the advantages that optical fibre offers over other sensing strategies. In this document, a review of the current state of the art for optical fibre sensors based on graphene materials is presented.