Sensitivity Enhancement in Low Cutoff Wavelength Long-Period Fiber Gratings by Cladding Diameter Reduction

被引：21

作者：

Del Villar, Ignacio ^{[1
,2
]}

Partridge, Matthew ^{[3
]}

Eduardo Rodriguez, Wenceslao ^{[4
]}

Fuentes, Omar ^{[5
]}

Bentor Socorro, Abian ^{[1
,2
]}

Diaz, Silvia ^{[1
,2
]}

Maria Corres, Jesus ^{[1
,2
]}

Wayne James, Stephen ^{[3
]}

Peter Tatam, Ralph ^{[3
]}

机构：

[1] Univ Publ Navarra, Dept Elect & Elect Engn, Pamplona 31006, Spain

[2] Univ Publ Navarra, Inst Smart Cities, Pamplona 31006, Spain

[3] Cranfield Univ, Engn Photon, Sch Aerosp Transport & Mfg, Cranfield MK43 0AL, Beds, England

[4] Univ Autonoma Tamaulipas, FIO Lab, Elect Engn Dept, Tamaulipas 88740, Mexico

[5] Pinar del Rio Univ, Dept Telecommun & Elect, Pinar Del Rio 20100, Cuba

来源：

SENSORS | 2017年 / 17卷 / 09期

基金：

英国工程与自然科学研究理事会;

关键词：

fiber optics sensors; fiber bragg gratings; fibers; single-mode; etching; pH sensor; TRANSITION; SENSORS; MODE;

D O I：

10.3390/s17092094

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The diameter of long-period fiber gratings (LPFGs) fabricated in optical fibers with a low cutoff wavelength was be reduced by hydrofluoric acid etching, enhancing the sensitivity to refractive index by more than a factor of 3, to 2611 nm/refractive index unit in the range from 1.333 to 1.4278. The grating period selected for the LPFGs allowed access to the dispersion turning point at wavelengths close to the visible range of the optical spectrum, where optical equipment is less expensive. As an example of an application, a pH sensor based on the deposition of a polymeric coating was analyzed in two situations: with an LPFG without diameter reduction and with an LPFG with diameter reduction. Again, a sensitivity increase of a factor of near 3 was obtained, demonstrating the ability of this method to enhance the sensitivity of thin-film-coated LPFG chemical sensors.

引用

页数：12

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