| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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A New Type of Absorbance Sensors Based on Long-Period Fiber Gratings |
| LUO Tao, GU Zheng-Tian**
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Laboratory of Photo-electric Functional Films, College of Science, University of Shanghai for Science and Technology, Shanghai 200093
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| Cite this article: |
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LUO Tao, GU Zheng-Tian 2011 Chin. Phys. Lett. 28 054207 |
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Abstract A new absorbance sensor based on long-period fiber gratings (LPFGs) is presented, The measurand is coated on the cladding of the LPFG. It is found that the depth of the stop band of the LPFG spectrum will be strongly affected by the absorbance of the measurand if an optimum coating thickness is selected. The analysis shows that within the optimal thickness range, the cladding modes could transform into the overlay modes and interact with the measurand more effectively. An absorbance sensitivity of 7×103 is available when the sensor structure is optimized.
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| Keywords:
42.79.Gn
42.81.Pa
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Received: 11 September 2010
Published: 26 April 2011
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