2016
DOI: 10.1109/jlt.2016.2563521
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High Sensitive Refractometric Sensor Using Symmetric Cladding Modes of an FBG Operating at Mode Transition

Abstract: 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 c… Show more

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Cited by 15 publications
(10 citation statements)
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“…The design strategy of optical fiber grating-based sensors with the effect of mode transition of cladding modes [15]- [17] needs to be optimized as per the order of the cladding modes because it has been observed that the MT behavior of comparative higher-order mode is different from that of lower-order cladding modes. It has been proved and reported earlier that the mode stretching effect can enhance the volume RI sensitivity of the lower-order cladding mode of FBG [26].…”
Section: Numerical Resultsmentioning
confidence: 99%
See 2 more Smart Citations
“…The design strategy of optical fiber grating-based sensors with the effect of mode transition of cladding modes [15]- [17] needs to be optimized as per the order of the cladding modes because it has been observed that the MT behavior of comparative higher-order mode is different from that of lower-order cladding modes. It has been proved and reported earlier that the mode stretching effect can enhance the volume RI sensitivity of the lower-order cladding mode of FBG [26].…”
Section: Numerical Resultsmentioning
confidence: 99%
“…were identified by quantification of surface-based changes. FBG based biochemical sensors are used for the detection of different bio-specimen like specific immunoassay [30], Detection of Thrombin [31] and in many other applications [3], [13], [17], [33]. Add-layer sensitivity of cladding modes of FBG was computed with a six-layer model; namely core-clad-overlay-receptor-specimen layer-surrounding medium as shown in Fig.…”
Section: Numerical Resultsmentioning
confidence: 99%
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“…With the invention of various new optical fibers and the upgrading of optical fiber processing technology, the optical fiber sensors have been deeply studied by an increasing number of scholars, and various optical fiber sensors with new structures or new sensing mechanism have sprung up [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Due to the superior advantages of small size, high sensitivity, simultaneous measurement of multiple parameters, optical fiber refractive index (RI) sensors have attracted a great deal of attention for physical, chemical and biomedical sensing [ 1 , 2 , 3 , 4 ].…”
Section: Introductionmentioning
confidence: 99%
“…In contrast to the widely-used prism-based refractometers, the RI sensors based on optical fibers offer many advantages, such as immunity to electromagnetic interference, high sensitivity, and low cost, and when biological sensing is considered -easy sample disposal. Various optical fiber RI sensors have been reported based on fiber Bragg gating (FBG) [1], [2], long-period grating (LPG) [3], [4], tapered fiber [5]- [8], and Fabry-Perot interferometer (FPI) [9], [10]. Among them, fiber-based Mach-Zehnder (MZI) [11]- [14] and Michelson [15], [16] interferometers are extensively studied for RI sensing.…”
Section: Introductionmentioning
confidence: 99%