Sensitivity enhancement in a multimode interference-based SMS fibre structure coated with a thin-film: Theoretical and experimental study

被引:33
作者
Socorro, A. B. [1 ]
Del Villar, I. [1 ]
Corres, J. M. [1 ]
Arregui, F. J. [1 ]
Matias, I. R. [1 ]
机构
[1] Univ Publ Navarra, Dept Elect & Elect Engn, UPNA Sensors Grp, Pamplona 31006, Spain
关键词
Single-mode-multimode-single-mode (SMS) fibre structure; Layer-by-layer; Thin-films; Optical fibre sensors; LONG-PERIOD GRATINGS; MODE RESONANCES; SENSORS; TEMPERATURE; FABRICATION; DEPOSITION; BIOSENSORS; OVERLAYS;
D O I
10.1016/j.snb.2013.08.090
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Multimode interference in a single-mode-multimode-single-mode (SMS) fibre structure leads to the generation of transmission bands and attenuation bands in the optical spectrum. In this work, the progressive deposition, with layer-by-layer assembly technique, of a high refractive index thin-film onto the SMS structure permits to observe the evolution of the bands as a function of the coating thickness. The results show that it is possible to increase the sensitivity of the device to variations of the coating thickness, what indicates the adequateness of this structure as a sensing platform. The experimental results are corroborated with a numerical method based on coupled-mode theory. As a practical application, a sensitivity improvement has been obtained a pH sensor by increasing the coating thickness. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:363 / 369
页数:7
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