External Refractive Index Sensitivity of Weakly Tilted Fiber Bragg Gratings With Different Coating Thicknesses

Caucheteur, Christophe; Paladino, Domenico; Pilla, P.; Cutolo, A.; Campopiano, Stefania; Giordano, M.; Cusano, A.; Mégret, Patrice

doi:10.1109/jsen.2008.926966

Cited by 29 publications

(18 citation statements)

References 12 publications

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“…On the other hand, surrounding RI alters effective indices of the cladding modes efficiently without any modification of the cladding geometry and therefore coupling between the forward propagating core mode to backward propagating cladding modes can be made highly sensitive to surrounding RI. Interaction of the modal fields of the cladding modes with the surrounding is usually enhanced by using tilted fiber Bragg gratings (TFBGs) [9][10][11][12][13][14][15][16]. However, from previous research it has been shown that the sensitivity of these sensors are not encouraging for water or a water based solution having RI around 1.333.…”

Section: Introductionmentioning

confidence: 99%

“…Performance could be enhanced by measuring the total reflective power of TFBG's cladding mode spectrum instead of measuring the wavelength shift [11]. TFBG refractometer with HRI coating has been used for SRI measurement near water [12] and recently it has been shown that enhancement of sensitivity of orthogonally polarized modes of TBFG can be done with HRI coating and have been studied in detail [13]. Also a high sensitive RI sensor to measure RIs around 1.33 has been reported where gold nano-shell was immobilized on a heavily etched standard FBG.…”

Section: Introductionmentioning

confidence: 99%

“…Recorded spectra of LP0,11 and LP0,12 cladding modes during deposition of overlay Measured wavelength shift of the resonant wavelength of LP0,12 cladding mode as a function of SRI (solid line represents the mean slope).…”

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confidence: 99%

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High Sensitive Refractometric Sensor Using Symmetric Cladding Modes of an FBG Operating at Mode Transition

Bandyopadhyay

Dey

Basumallick

et al. 2016

J. Lightwave Technol.

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We report a high sensitive refractive index (RI) sensor using fiber Bragg grating (FBG) where azimuthally symmetric resonant cladding modes were used for RI sensing. We enhanced the sensitivity by tailoring the effective index of a cladding mode to an optimum value so that the mode has maximum sensitivity around a specific surrounding RI. We tailored the effective index of a clad mode by controlled deposition of a thin polymer layer having RI higher than the cladding. Experiments show that the sensitivity of cladding mode (LP 0,12 ) of a standard FBG with overlay coating to the surrounding medium having RI around 1.333 is ~ 2600 pm/RIU. The proposed sensing mechanism will be useful for biological sensing application.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High Sensitive Refractometric Sensor Using Symmetric Cladding Modes of an FBG Operating at Mode Transition

Bandyopadhyay

Dey

Basumallick

et al. 2016

J. Lightwave Technol.

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“…Analysis of the transmission spectrum facilitates measurements with resolution of 10 -4 RIU [11]. The use of thin film coatings of refractive index higher than that of the cladding on both polished FBGs and TFBGS has been shown to allow the RI range over which the devices show their highest sensitivity to the tuned to lower values [10,12,13].…”

Section: Introductionmentioning

confidence: 99%

Optical Fibre Long-Period Gratings Functionalised with Nano-Assembled Thin Films: Approaches to Chemical Sensing

Korposh¹,

James²,

Tatam³

et al. 2013

Current Trends in Short- And Long-Period Fiber Gratings

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“…In addition, a proper modification of the demodulation technique based on the monitoring of spectra partitions depending on the cladding mode order provides a valuable tool for sensitivity tailoring and re-configurability, also considering the possibility of depositing ring shaped high refractive index nano-coatings onto the grating [9][10].…”

Section: Introductionmentioning

confidence: 99%

All-fiber hybrid cavity for sensing applications

et al. 2009

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By now, fiber Bragg gratings (FBGs) represent a well assessed technology in both communications and sensing fields. In particular, thanks to their small signal bandwidth and wavelength encoded information, they allow simple measurements in reflection for sensing purposes and also easy multiplexing capability in realizing sensors arrays. Unfortunately, to make FBGs sensitive to surrounding-medium refractive index (SRI), hosting fiber structuring is needed. In last years, also tilted FBGs (TFBGs) -intrinsically SRI sensitive structures -have been proposed as promising technological platform for several sensing applications. However, complex spectral features combined with the difficulty to be configured as quasi distributed or multi-point sensors network limit the practical exploitation of this assessed and mature technology. It would be extremely useful to merge the peculiar spectral characteristics of both grating types. To address this issue, here, we propose a hybrid cavity involving two unbalanced uniform FBGs written at both sides of a TFBG to form an all-fiber interferometer. The proposed configuration provides a wavelength gated reflection signal with interference fringes depending on the cavity features modulated by spectral dips associated to the wavelength dependent optical losses due to cladding mode coupling occurring along the TFBG. Such a structure preserves the advantages of uniform FBGs in terms of interrogation methods and allows the possibility to contemporarily measure multiple parameters.

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External Refractive Index Sensitivity of Weakly Tilted Fiber Bragg Gratings With Different Coating Thicknesses

Cited by 29 publications

References 12 publications

High Sensitive Refractometric Sensor Using Symmetric Cladding Modes of an FBG Operating at Mode Transition

High Sensitive Refractometric Sensor Using Symmetric Cladding Modes of an FBG Operating at Mode Transition

Optical Fibre Long-Period Gratings Functionalised with Nano-Assembled Thin Films: Approaches to Chemical Sensing

All-fiber hybrid cavity for sensing applications

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