Journal ArticleDOI
Sensitivity characteristics of long-period fiber gratings
Xuewen Shu,Lin Zhang,Ian Bennion +2 more
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TLDR
In this paper, the sensitivity of long-period fiber gratings (LPFGs) is investigated as a function of temperature, strain, and surrounding refractive index, with particular attention to the higher order cladding modes and the possibilities for ultrasensitive sensors.Abstract:
We present a detailed investigation into the sensitivity of long-period fiber gratings (LPFGs) as a function of temperature, strain, and surrounding refractive index, with particular attention to the higher order cladding modes and the possibilities for ultrasensitive sensors. From a general theoretical analysis, we identify a general sensitivity factor which offers new physical insight into LPFG behavior and represents a useful design aid in conjunction with a set of measurand-specific sensitivity factors. Our analysis reveals the existence of turning points in the mode dispersion characteristics at which ultrasensitive operation may be obtained. In an extensive set of coordinated experiments, we verify the theoretical predictions with close agreement and provide demonstrations of the device behavior close to the turning points. Alternative sensor schemes for temperature, strain, and refractive index based, respectively, on measurement of the dual resonance characteristic of the modes and on the transmission characteristics close to the turning points, utilizing higher order modes of the LPFG, are presented. For two variables at least, we record the highest LPFG sensitivities yet reported.read more
Citations
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Journal ArticleDOI
Sensitive optical biosensors for unlabeled targets: a review.
TL;DR: This article reviews the recent progress in optical biosensors that use the label-free detection protocol, in which biomolecules are unlabeled or unmodified, and are detected in their natural forms, and focuses on the optical biosENSors that utilize the refractive index change as the sensing transduction signal.
Journal ArticleDOI
Highly sensitive fiber Bragg grating refractive index sensors
TL;DR: In this paper, the authors combine fiber Bragg grating (FBG) technology with a wet chemical etch-erosion procedure and demonstrate two types of refractive index sensors using singlemode optical fibers.
Journal ArticleDOI
Thinned fiber Bragg gratings as high sensitivity refractive index sensor
TL;DR: In this paper, the numerical and experimental analysis on the use of thinned fiber Bragg gratings as refractive index sensors have been carried out, where wet chemical etching in a buffered hydrofluoric acid solution was used for sensor fabrication.
Journal ArticleDOI
Laser-micromachined Fabry-Perot optical fiber tip sensor for high-resolution temperature-independent measurement of refractive index.
TL;DR: A Fabry-Perot (F-P) optical fiber tip sensor for high-resolution refractive-index measurement fabricated by using 157-nm laser micromachining, for the first time to the authors' knowledge, is proposed and demonstrated.
Journal ArticleDOI
Towards a Uniform Metrological Assessment of Grating-Based Optical Fiber Sensors: From Refractometers to Biosensors
TL;DR: A metrological assessment of grating-based optical fiber sensors is proposed with the aim of providing an objective evaluation of the performance of this sensor category, providing the basis for an easier and direct performance comparison of a great number of sensors published in the literature up to now.
References
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Long-period fiber grating as band-rejection filters
TL;DR: In this paper, a new class of long-period fiber gratings that can be used as in-fiber, low-loss, band-rejection filters is presented.
Journal ArticleDOI
Long-period fiber gratings as band-rejection filters
Ashish Madhukar Vengsarkar,Paul Joseph Lemaire,J. B. Judkins,Vikram Bhatia,Turan Erdogan,John E. Sipe +5 more
TL;DR: In this paper, a new class of long-period fiber gratings that can be used as in-fiber, low-loss, band-rejection filters is presented.
Journal ArticleDOI
Optical fiber long-period grating sensors.
TL;DR: A novel class of highly sensitive sensors based on long-period fiber gratings that can be implemented with simple and inexpensive demodulation schemes are presented.
Journal ArticleDOI
Analysis of the response of long period fiber gratings to external index of refraction
TL;DR: In this article, the authors demonstrate that the change in wavelength of a long period fiber grating attenuation band with changes in external index of refraction can be enhanced by proper selection of the grating period.
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