Journal
OPTICS LETTERS
Volume 26, Issue 20, Pages 1541-1543Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.26.001541
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We propose and demonstrate the possibility of using a permanently microbent bare optical fiber for detecting chemical species. Two detection schemes, viz., a bright-field detection scheme (for the core modes), and a dark-field detection scheme (for the cladding modes) have been employed to produce a fiber-optic sensor. The sensor described here is sensitive enough to detect concentrations as low as nanomoles per liter of a chemical species, with a dynamic range of more than 6 orders of magnitude. (C) 2001 Optical Society of America.
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