Inverted-graded index fiber structures for evanescent-wave chemical sensing

Matejec, Vlastimil; Chomat, M.; Kašík, Ivan; Čtyroký, Jiřı́; Berková, Daniela; Hayer, Miloš

doi:10.1016/s0925-4005(98)00190-7

Cited by 15 publications

(7 citation statements)

References 6 publications

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“…The types of fibers mentioned above are now produced commercially [ 24 , 25 ]. The development and investigation of designed OF in that way has been done with the aim of increasing the evanescence field [ 26 , 27 , 28 , 29 , 30 ] resulting in increasing the sensitivity and detection limit of FOS. One way was two-cone tapered fiber (see Figure 2 B) used to determine the concentration of chemicals surrounding the tapered OF in the transmission arrangement [ 1 , 2 , 3 ] as well as the development of tapered fiber optical elements (FOE, see Figure 2 C,D).…”

Section: Optical Principles Of Fiber Chemical Sensors and Biosensomentioning

confidence: 99%

Fiber-Optic Chemical Sensors and Fiber-Optic Bio-Sensors

Pospı́šilová

Kuncová

Trögl

2015

Sensors

171

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This review summarizes principles and current stage of development of fiber-optic chemical sensors (FOCS) and biosensors (FOBS). Fiber optic sensor (FOS) systems use the ability of optical fibers (OF) to guide the light in the spectral range from ultraviolet (UV) (180 nm) up to middle infrared (IR) (10 µm) and modulation of guided light by the parameters of the surrounding environment of the OF core. The introduction of OF in the sensor systems has brought advantages such as measurement in flammable and explosive environments, immunity to electrical noises, miniaturization, geometrical flexibility, measurement of small sample volumes, remote sensing in inaccessible sites or harsh environments and multi-sensing. The review comprises briefly the theory of OF elaborated for sensors, techniques of fabrications and analytical results reached with fiber-optic chemical and biological sensors.

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Section: Optical Principles Of Fiber Chemical Sensors and Biosensomentioning

confidence: 99%

Fiber-Optic Chemical Sensors and Fiber-Optic Bio-Sensors

Pospı́šilová

Kuncová

Trögl

2015

Sensors

171

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“…The increase in C-H bonds can lead to the formation of some functional group at the surface of the core. Thus, the plasma treatment of a step-index fiber can convert it to an inverted-graded index (IGI) fiber [17]. Figure 9 shows the affected depth in the core region with nitrogen, oxygen, and hydrogen plasma exposure times.…”

Section: Variations In Cladding Indexmentioning

confidence: 99%

Effect of glow discharge plasma on step index polymer optical fiber parameters

Medhat¹,

El-Zaiat²,

Sauday³

et al. 2016

Turk J Phys

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DC glow discharge plasma of power 40 W was applied to step index polymer optical fibers for different exposure times. Nitrogen, oxygen, and hydrogen gases were used to obtain the glow discharge. The fiber core material was poly methyl methacrylate and the cladding was fluorinated polymer. The effect of plasma on the optical parameters, such as core index profile, cladding index, and the numerical aperture, was studied by multiple beam interference fringes and Fourier transformation of infrared spectroscopy spectra. It was found that the plasma treatment affected the optical parameters of both the cladding and the core regions of optical fibers. The optical parameters also changed with the treatment time. The hydrogen plasma had effects greater than those of nitrogen and oxygen plasma. These observed results can be explained by the effect of the electric field during plasma treatment. The studied optical fibers after plasma treatment can be used as inverted-graded index with its important applications.

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“…The wavelength range go from ultraviolet to infrared. Due to bends the light may exit the core of the fibers and then it will be interesting to develope fibers with special refractive index profiles [40][41][42][43][44][45][46][47][48][49][50]. Fiber optics manufactures with different materials like silica doped glasses and plastic have been developed have been developed for biomedical applications between UV and IR.…”

Section: Optical Fibers For Biomedical Applicationsmentioning

confidence: 99%

Fiber probes based optical techniques for biomedical diagnosis

Arce-Diego

Fanjul-Vélez

2007

SPIE Proceedings

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Although fiber optics have been applied in optical communication and sensor systems for several years in a very successful way, their first application was developed in medicine in the early 20's. Manufacturing and developing of optical fibers for biomedical purposes have required a lot of research efforts in order to achieve a non-invasive, in-vivo, and real-time diagnosis of different diseases in human or animal tissues. In general, optical fiber probes are designed as a function of the optical measurement technique. In this work, a brief description of the main optical techniques for optical characterization of biological tissues is presented. The recent advances in optical fiber probes for biomedical diagnosis in clinical analysis and optical biopsy in relation with the different spectroscopic or tomographic optical techniques are described.

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Inverted-graded index fiber structures for evanescent-wave chemical sensing

Cited by 15 publications

References 6 publications

Fiber-Optic Chemical Sensors and Fiber-Optic Bio-Sensors

Fiber-Optic Chemical Sensors and Fiber-Optic Bio-Sensors

Effect of glow discharge plasma on step index polymer optical fiber parameters

Fiber probes based optical techniques for biomedical diagnosis

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