镀高折射率纳米膜的长周期光纤光栅特性研究

于秀娟; 张敏; 王利威; 雷鸣; 廖延彪

doi:doi:10.3788/aos20092910.2665

光学学报, 2009, 29 (10): 2665, 网络出版: 2009-10-19

镀高折射率纳米膜的长周期光纤光栅特性研究

Characteristics of Long-Period Optical Fiber Grating with High Refractive Index nm-Thick Film Overlay

论文大纲

于秀娟 ^1,2,*张敏 ¹王利威 ¹雷鸣 ¹廖延彪 ¹

作者单位

¹ 清华大学电子工程系光纤传感研究中心,北京 100084

² 黑龙江大学光纤技术研究所,黑龙江哈尔滨 150080

摘要

针对镀高折射率纳米膜的长周期光栅,建立了传感理论模型,研究了长周期光栅的谐振波长与纳米膜厚度及外界折射率的关系,给出不同纳米膜厚度下长周期光栅不同包层模式重组特性。研究发现,当长周期光栅外面镀上一层沿角向均匀分布的纳米膜时,随着膜厚变化会出现包层模分布的明显调制；适当选择镀膜参数和外界介质折射率,最低次包层模式HE1,2会成为镀膜层中的导模,其他的包层模式将会发生模式转换现象；对于较低次包层模式(如HE1,6),在模式转换的时候存在两步转换,而高次的包层模只有一步转换(如HE1,14)。同时给出了包层模式转换对外界折射率响应的关系:当膜层厚度增加时,长周期光栅模式转换现象移至低折射率区域。

Abstract

The sensing theoretical model of long-period gratings (LPGs) with high-refractive-index nanometer film coating is built. The influence of overlay thickness and external refractive index on the resonant wavelength of LPG is investigated theoretically. The phenomenon of reorganization of cladding modes at different coating film thicknesses is shown and explained in detail. The theoretical analysis shows that a significant modification of the distribution of cladding modes is seen as an azimuthally symmetric nanoscale high-refractive-index coating deposited on the cladding of LPG. If the parameters of layers (the refractive index and thickness) and the external refractive index are chosen accurately,the lowest cladding mode HE1,2 will become the overlay mode and other cladding modes will experience mode transition. For the lower cladding modes (such as HE1,6),there is two-step modes transition. For higher cladding modes(such as HE1,14),there is only the one-step modes transition. The mode transition on the sensitivity of the external refractive index is also analyzed:Modes transition shifts to lower refractive index region with the increase of the overlay thickness.

参考文献

[1] D. D. Davis,T. K. Gaylord,E. N. Glytsis et al.. Very-high-temperature stable CO2-laser-induced long-period fibre gratings[J]. Electron. Lett.,1999,35(9):40-742

[2] G. Humbert,A. Malki. Temperature characterization of long-period fiber gratings fabricated with electric arc discharge[C]. SPIE,2001,4579:176-181

[3] M. Yokota,H. Oka,T. Yoshino. Mechanically induced long period fiber grating and its application for distributed sensing[C]. SPIE,2002,1:35-138

[4] J. H. Chong,P. Shum,H. Haryono et al.. Measurements of refractive index sensitivity using long-period grating refracto meter [J]. Opt. Commun.,2004,229(1-6):65-69

[5] J. F. Ding,A. P. Zhang. Fiber-taper seeded long-period grating pair as a highly sensitive refractive-index sensor [J]. IEEE Photonics Technol. Lett.,2005,17(6):1247-1249

[6] X. K. Zeng,Y. J. Rao,Y. P. Wang et al.. Transverse load,static strain,temperature and vibration measurement using a cascaded FBG/EFPI/LPFG sensor system[C]. Proc.OFS,2002,1:199-202

[7] S. W. James,S. Khaliq,R. P. Tatam. Fiber-optic liquid-level sensor using long period grating [J]. Opt. Lett.,2001,26(16):127-130

[8] J. L. Elster. Long Period Grating-Based pH Sensors for Corrosion Monitoring[D]. Blacksburg:Faculty of the Virginia Polytechnic Institute and State Vniversity,1999

[9] Y. Liu,L. W. Wang,M. Zhang et al.. Long-period grating relative humidity sensor with hydrogel coating[J]. IEEE Photon. Technol. Lett.,2007,19(12):880-882

[10] 赵洪霞,鲍吉龙,陈莹. 长周期光纤光栅弯曲传感特性[J]. 光学学报,2008,28(9):1681-1685

Zhao Hongxia,Bao Jilong,Chen Ying. Bending sensing rules for long-period fiber gratings[J]. Acta Optica Sinica,2008,28(9):1681-1685

[11] 赵洪霞,鲍吉龙,陈莹. 弯曲曲率对长周期光纤光栅透射谱特性的影响[J]. 中国激光,2008,35(5):722-755

Zhao Hongxia,Bao Jilong,Chen Ying. Effect of bending curvature on transmission spectra of long period fiber gratings [J]. Chinese J. Lasers,2008,35(5):722-755

[12] H. J. Patrick,A. D. Kersey,F. Bucholtz. Analysis of the response of long period fiber gratings to external index of refraction [J]. J. Lightwave Technol.,1998,16(9):1606-1611

[13] N. D. Rees,S. W. James,R. P. Tatam et al.. Optical fiber long-period gratings with langmuir-blodgett thin-film overlays [J]. Opt. Lett.,2002,27(9),686-688

[14] I. Del Villar,I. R. Matias,F. J. Arregui et al.. Optimization of sensitivity in long period fiber gratings with overlay deposition [J]. Opt. Express,2005,13(1):56-69

[15] A. Cusano,A. Iadicicco,P.Pilla et al.. Cladding mode reorganization in high-refractive index-coated long-period gratings:effects on the refractive-index sensitivity[J]. Opt. Lett.,2005,30(19):2356-2358

[16] C. Tsao. Optical Fiber Waveguide Analysis [M]. NewYork:Oxford University Press,1992

[17] I. Del Villar,M. Achaerandio,I. R. Matías et al.. Deposition of an overlay with electrostatic selfassembly method in long period fiber gratings [J]. Opt. Lett.,2005,30(7):720-722

于秀娟, 张敏, 王利威, 雷鸣, 廖延彪. 镀高折射率纳米膜的长周期光纤光栅特性研究[J]. 光学学报, 2009, 29(10): 2665. Yu Xiujuan, Zhang Min, Wang Liwei, Lei Ming, Liao Yanbiao. Characteristics of Long-Period Optical Fiber Grating with High Refractive Index nm-Thick Film Overlay[J]. Acta Optica Sinica, 2009, 29(10): 2665.

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