材料科学
光学
光电子学
栅栏
波导管
硅
表面等离子体子
包层(金属加工)
折射率
表面等离子体激元
波长
严格耦合波分析
光纤
表面等离子共振
作者
Zhihong Li,Haiyong Zhu
出处
期刊:Optics Letters
[The Optical Society]
日期:2021-01-15
卷期号:46 (2): 266-269
被引量:3
摘要
We carry out a very early theoretical study on surface waveguide modes excited in a long-period fiber grating (LPFG) coated with gold–silicon thin films for refractive index sensing. The surface waveguide modes originate from the intermode transition of EH cladding modes and present a very strong evanescent field penetrating into the surrounding medium, which makes them ultrasensitive to external changes. By tracking the dual resonances of surface waveguide modes, ultrahigh sensitivity up to 7267.7nm/RIU around 1.315 is obtained, which is 76-/4-fold higher than the case of bare LPFG/LPFG-assisted surface plasmon resonance, together with the capability of self-referenced measurement. This new, to the best of our knowledge, concept is expected to find wide applications based on refractive index sensing.
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