Temperature-Insensitive Miniaturized Fiber Inline Fabry-Perot Interferometer for Highly Sensitive Refractive Index Measurement
We report a miniaturized fiber inline Fabry-Perot interferometer (FPI), with an open micro-notch cavity fabricated by one-step fs laser micromachining, for highly sensitive refractive index measurement. The device was tested for measurement of the refractive indices of various liquids including isopropanol, acetone and methanol at room temperature, as well as the temperature-dependent refractive index of deionized water from 3 to 90°C. The sensitivity for measurement of refractive index change of water was 1163 nm/RIU at the wavelength of 1550 nm. The temperature cross-sensitivity of the device was about 1.1x10-6 RIU/°C. The small size, all-fiber structure, small temperature dependence, linear response and high sensitivity, make the device attractive for chemical and biological sensing.
T. Wei et al., "Temperature-Insensitive Miniaturized Fiber Inline Fabry-Perot Interferometer for Highly Sensitive Refractive Index Measurement," Optics Express, Optical Society of America, Apr 2008.
The definitive version is available at http://dx.doi.org/10.1364/OE.16.005764
Mechanical and Aerospace Engineering
Electrical and Computer Engineering
United States. Office of Naval Research
University of Missouri Research Board
Keywords and Phrases
Fabry-Perot; Fiber Optics Components; Fiber Optics Sensors
Article - Journal
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