External refractive index insensitive air-cladlong period fibre grating

Espindola, R.P.; Windeler, R.S.; Abramov, A. A.; Eggleton, Benjamin J.; Strasser, T.A.; DiGiovanni, D. J.

doi:10.1049/el:19990160

Cited by 39 publications

(15 citation statements)

References 3 publications

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“…), chemical compounds in gas and liquids, and even biosensors. In particular, since 1999 , Espindola et a., 1999, Diez et al, 2000, Kakarantzas et al, 2002, Lim et al, 2004, the writing of LPGs into different types of www.intechopen.com PCFs with or without photosensitivity by the use of advanced laser processing techniques along with mechanical and chemical methods was quickly embraced expecting many new applications as sensors (Frazao et al, 2008) and fiber components (Y. Wang et al, 2007).…”

Section: Long Period Gratings In Photonic Crystal Fibersmentioning

confidence: 99%

Long Period Gratings in New Generation Optical Fibers

Iadicicco¹,

Paladino²,

Pilla³

et al. 2012

Recent Progress in Optical Fiber Research

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Section: Long Period Gratings In Photonic Crystal Fibersmentioning

confidence: 99%

Long Period Gratings in New Generation Optical Fibers

Iadicicco¹,

Paladino²,

Pilla³

et al. 2012

Recent Progress in Optical Fiber Research

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“…There has been a strong interest in recent years in using gratings in fibres to produce chemical sensors, including long period gratings (LPGs) [1,2,3], fibre Bragg gratings (FBGs) and tilted fibre Bragg gratings (TFBGs). At present the majority of these sensors are used to detect the heavier organic/inorganic compounds, such as detection of organic aromatic compounds in paraffin [3].…”

Section: Introductionmentioning

confidence: 99%

The exploitation of thin film coatings for fibre sensors for the application of chemical sensing

Allsop

Neal

Kalli

et al. 2009

Photonics in the Transportation Industry: Auto to Aerospace II

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We report on the use of thin film coatings, both single and multi-layered, deposited on the flat side of a lapped, D-shaped fibre to enhance the sensitivity of two kinds of surface plasmon resonance based optical fibre sensors. The first kind involves the use of a tilted Bragg grating inscribed within the fibre core, prior to fibre coating, while the second relies on a surface relief grating photoinscribed after the fibre has been coated. Some of the devices operate in air with high coupling efficiency in excess of 40dB and an estimated index sensitivity of Δλ/Δn = 90nm from 1 to 1.15 index range showing potential for gas sensing. Other sensors produced index sensitivities (Δλ/Δn) ranging from 6790nm to 12500nm in the aqueous index regime. The materials used for these fibre optical devices are germanium, silica, silver, gold and palladium.

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“…Coupling of light from the core to various cladding modes results in a set of attenuation bands in the transmitted light. The study of the LPG attenuation bands has yielded many potential applications in the field of sensing through their sensitivities to strain, temperature, refractive index and bending/shape [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. The LPG sensitivity can manifest itself in two ways; firstly through the spectral shift in the attenuation band, which here we refer to as spectral sensitivity, and secondly through a change in the strength of the attenuation band.…”

Section: Introductionmentioning

confidence: 99%

“…Examples include the use of air-clad [8] or depressed-cladding [9] fibres to desensitise the structure to changes in the refractive index of the surrounding medium, and the use of three-layered W-fibres either to reduce sensitivity to temperature changes [10] or, alternatively, to maximise the temperature sensitivity [11]. A promising application of LPGs is in bend or shape sensing where several papers have been published [5,6,12].…”

Section: Introductionmentioning

confidence: 99%

The spectral sensitivity of long-period gratings fabricated in elliptical core D-shaped optical fiber

et al. 2004

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Long period gratings (LPGs) were written into a D-shaped optical fibre, which has an elliptical core with a W-shaped refractive index profile. The LPG's attenuation bands were found to be sensitive to the polarisation of the interrogating light with a spectral separation of about 15nm between the two orthogonal polarisation states. In addition, two spectrally overlapping attenuation bands corresponding to orthogonal polarisation states were observed; modelling successfully reproduced this spectral feature. The spectral sensitivity of both orthogonal states was experimentally measured with respect to temperature, surrounding refractive index, and directional bending. These LPG devices produced blue and red wavelength shifts of the stop-bands due to bending in different directions. The measured spectral sensitivities to curvatures, d /dR, ranged from -3.56nm m to +6.51nm m. The results obtained with these LPGs suggest that this type of fibre may be useful as a shape/bend sensor. It was also demonstrated that the neighbouring bands could be used to discriminate between temperature and bending and that overlapping orthogonal polarisation attenuation bands can be used to minimise error associated with polarisation.

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External refractive index insensitive air-cladlong period fibre grating

Cited by 39 publications

References 3 publications

Long Period Gratings in New Generation Optical Fibers

Long Period Gratings in New Generation Optical Fibers

The exploitation of thin film coatings for fibre sensors for the application of chemical sensing

The spectral sensitivity of long-period gratings fabricated in elliptical core D-shaped optical fiber

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