Optic sensors of high refractive-index responsivity and low thermal cross sensitivity that use fiber Bragg gratings of &gt;80° tilted structures

Zhou, Kaiming; Zhang, Lin; Chen, Xianfeng F.; Bennion, I.

doi:10.1364/ol.31.001193

Cited by 121 publications

(80 citation statements)

References 9 publications

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“…9(b), the intensity of both peaks of 81°-TFG will eventually decreased by further increasing the loading force. This may be explained by the fact that the birefringence Δn will be reduced with increasing load when the loading force applied to the slow-axis of the 81°-TFG [10]. Thus, the low birefringence cannot maintain the light in two polarization states.…”

Section: Experimental Set Up For Load Sensing and Resultsmentioning

confidence: 99%

“…Therefore, we prefer fabricated the 81°-TFBG for its sensing characters demonstration. The large angle TFGs have been proposed as fiber sensors for the detection of strain [10], twist [11], refractive index (RI) and liquid level [12,13]. Due to its inherent polarization mode splitting effect caused by the asymmetric structure induced by the excessively tilted index fringes in the fiber core, a large angle TFG has been implemented as a novel in-fiber directional transverse loading sensor [14].…”

Section: Introductionmentioning

confidence: 99%

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All-Fiber Loading Sensor Based on a Hybrid 45° and 81° Tilted Fiber Grating Structure

et al. 2016

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Abstract-We experimentally demonstrate an all-fiber loading sensor system based on a 45°-and an 81°-tilted fiber grating (TFG). We have fabricated two TFGs adjacent to each other in a single fiber to form a hybrid structure. When the transverse load applied to the 81º-TFG, the light coupling to the two orthogonally polarized modes will interchange the power according to the load applied to the fiber, which provides a solution to measure the load. For real applications, we further investigated the interrogation of this all fiber loading sensor system using a low-cost and compact-size single wavelength source and a power meter. The experimental results have clearly shown that a low-cost high-sensitivity loading sensor system can be developed based on the proposed TFG configuration.

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Section: Experimental Set Up For Load Sensing and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

All-Fiber Loading Sensor Based on a Hybrid 45° and 81° Tilted Fiber Grating Structure

et al. 2016

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“…1(b). The 81°-TFG is inherently very sensitive to the surrounding medium refractive index and can be implemented as an optical fiber biosensor platform [20]. Since the grating period (~32μm) of 81°-TFG is much smaller than that (~550μm) of standard LPG, the separations of its coupled cladding modes are much closer.…”

Section: Fabrication Of 81°-tfgmentioning

confidence: 99%

“…Therefore, theoretically speaking, we can fabricate and biofunctionalize a longer 81°-TFG to increase the effective quantity of the GOD molecules to improve its glucose detection sensitivity and the red-shift amplitude. In addition, choosing a relatively higher-order cladding mode of 81°-TFG can further enhance these two parameters for biosensing performance, as the RI sensitivity of a higher-order mode of the 81°-TFG is larger than that of a lower-order one [20]. …”

Section: God D Glu E H O O D Gluconic Acid H Omentioning

confidence: 99%

Novel glucose sensor based on enzyme-immobilized 81° tilted fiber grating

Luo¹,

Yan²,

Sun³

et al. 2014

Opt. Express

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Abstract:We demonstrate a novel glucose sensor based on an optical fiber grating with an excessively tilted index fringe structure and its surface modified by glucose oxidase (GOD). The aminopropyltriethoxysilane (APTES) was utilized as binding site for the subsequent GOD immobilization. Confocal microscopy and fluorescence microscope were used to provide the assessment of the effectiveness in modifying the fiber surface. The resonance wavelength of the sensor exhibited red-shift after the binding of the APTES and GOD to the fiber surface and also in the glucose detection process. The red-shift of the resonance wavelength showed a good linear response to the glucose concentration with a sensitivity of 0.298nm·(mg/ml) −1 in the very low concentration range of 0.0~3.0mg/ml. Compared to the previously reported glucose sensor based on the GOD-immobilized long period grating (LPG), the 81° tilted fiber grating (81°-TFG) based sensor has shown a lower thermal cross-talk effect, better linearity and higher Q-factor in sensing response. In addition, its sensitivity for glucose concentration can be further improved by increasing the grating length and/or choosing a higher-order cladding mode for detection. Potentially, the proposed techniques based on 81°-TFG can be developed as sensitive, label free and micro-structural sensors for applications in food safety, disease diagnosis, clinical analysis and environmental monitoring.

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“…Tilted fiber Bragg grating (TFBG) have been extensively investigated in recent years due to its unique properties in the field of sensing [1][2][3][4][5][6][7][8][9][10][11][12]. Bragg gratings in multimode fibers (MMFs) have also attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

Tilted fiber Bragg grating in graded-index multimode fiber and its sensing characteristics

Gong

2013

Photonic Sens

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Tilted fiber Bragg grating (TFBG) and reflective tilted fiber Bragg grating (R-TFBG) were proposed and demonstrated in the graded-index multimode fiber (GI-MMF). The TFBGs with grating planes tilted at an angle of 2.5° corresponding to the fiber axis were inscribed. The TFBGs in the GI-MMF had the good linear sensitivity to the temperature, strain and curvature. The fiber was then cleaved at the far end of the TFBG to form an R-TFBG using the Fresnel reflection of the fiber end. The reflective spectra of the R-TFBG were given, and the temperature sensing properties were also investigated.

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Optic sensors of high refractive-index responsivity and low thermal cross sensitivity that use fiber Bragg gratings of >80° tilted structures

Cited by 121 publications

References 9 publications

All-Fiber Loading Sensor Based on a Hybrid 45° and 81° Tilted Fiber Grating Structure

All-Fiber Loading Sensor Based on a Hybrid 45° and 81° Tilted Fiber Grating Structure

Novel glucose sensor based on enzyme-immobilized 81° tilted fiber grating

Tilted fiber Bragg grating in graded-index multimode fiber and its sensing characteristics

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