Deposition of coatings on long-period fiber gratings: tunnel effect analogy

被引：20
|
作者：
Del Villar, I. [1 ]
Matias, I. R. [1 ]
Arregui, F. J. [1 ]
机构：
[1] Univ Publ Navarra, Dept Ingn Elect & Elect, Pamplona 31006, Spain
来源：
OPTICAL AND QUANTUM ELECTRONICS | 2006年 / 38卷 / 08期
关键词：
gratings; coupled-mode analysis; thin films; optical fiber sensors;
D O I：
10.1007/s11082-006-9002-3
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The sensitivity of Long-period fiber gratings (LPFGs), coated with high-refractive-index thin film overlays, to the refractive index and the thickness of the overlay, and to the ambient refractive index, can be enhanced with a design based on a two-overlay coating of an LPFG. The first overlay of lower refractive index than the cladding affects the guidance of a cladding mode in the second overlay of higher refractive index than the cladding. This causes a more abrupt cladding modal redistribution than with the deposition of a unique high-refractive-index overlay. The phenomenon is analyzed with a method based on a vectorial analysis of modes and the application of coupled mode theory.
引用
收藏
页码：655 / 665
页数：11
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