期刊
SENSORS AND ACTUATORS A-PHYSICAL
卷 218, 期 -, 页码 88-93出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2014.07.022
关键词
Prism coupling optical waveguide configuration; Ultrahigh-order modes; Chromogenic glyphosate; Attenuated total reflection (ATR) dips
资金
- National Natural Science Foundation of China [61265001, 11264016]
- Scientific Research Fund of Jiangxi Provincial Education Department [GJJ13237, GJJ12172]
- National Basic Research Programmer of China [2013CBA01703]
- Scientific Research Fund of Xin Jiang [SAO720023]
We herein discuss a prism coupling hollow-core metal-cladded waveguide (HCMW) sensor that uses ultrahigh-order modes (UHM) for sensitive absorption detection of glyphosate. In our method, modified chromogenic glyphosate in the hollow-core serves as guiding medium for high-power wave propagation. Prism coupling is employed to generate attenuated total reflection (ATR) dips of the UHM. The depths of the dips are closely related to the extinction coefficient of chromogenic glyphosate. A glyphosate detection limit below1.4 nm/l is experimentally demonstrated with low consumption and solution-free operation. The calibration curve has been found linear in the concentration range of 0.0-5.0 nm/l. (C) 2014 Elsevier B.V. All rights reserved.
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