期刊
APPLIED OPTICS
卷 51, 期 16, 页码 3236-3242出版社
OPTICAL SOC AMER
DOI: 10.1364/AO.51.003236
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资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Fundacao para a Ciencia e Tecnologia (FCT) CAPES-FCT Brazil/Portugal [293/11]
- Financiadora de Estudos e Projetos (FINEP)
- Pro-Defesa CAPES/Ministerio da Defesa [23038.029912/2008-05]
- MICRO-PHYTE [PTDC/EBB-EBI/102728/2008]
- European Union (EU) [SFRH/BD/47799/2008]
- Portuguese State
- project COST [299]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/47799/2008] Funding Source: FCT
The proposed sensing device relies on the self-imaging effect that occurs in a pure silica multimode fiber (coreless MMF) section of a single-mode-multimode-single-mode (SMS)-based fiber structure. The influence of the coreless-MMF diameter on the external refractive index (RI) variation permitted the sensing head with the lowest MMF diameter (i.e., 55 mu m) to exhibit the maximum sensitivity (2800 nm/RIU). This approach also implied an ultrahigh sensitivity of this fiber device to temperature variations in the liquid RI of 1.43: a maximum sensitivity of -1880 pm/degrees C was indeed attained. Therefore, the results produced were over 100-fold those of the typical value of approximately 13 pm/degrees C achieved in air using a similar device. Numerical analysis of an evanescent wave absorption sensor was performed, in order to extend the range of liquids with a detectable RI to above 1.43. The suggested model is an SMS fiber device where a polymer coating, with an RI as low as 1.3, is deposited over the coreless MMF; numerical results are presented pertaining to several polymer thicknesses in terms of external RI variation. (C) 2012 Optical Society of America
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