Journal
APPLIED OPTICS
Volume 53, Issue 31, Pages 7454-7461Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.53.007454
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Funding
- CNPq
- FAPESP [11/00322-2]
- INCTAA (CNPq) [573894/2008-6]
- INCTAA (FAPESP) [2008/57808-1]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [11/00322-2] Funding Source: FAPESP
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An embedded silica optical microfiber knot resonator humidity sensor is presented. As silica has a poor response to environmental humidity changes, a surrounding layer of Nafion is used as a transducer. Spectral characterization and also a procedure to determine the coupling and total loss coefficients are presented. Sensitivity as high as (0.29 +/- 0.01) nm/% relative humidity has been noticed. Possible issues that emerge from the use of Nafion such as bulk swelling, refractive index hysteresis, as well as a saturation process, are discussed. (C) 2014 Optical Society of America
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