HIGH-SENSITIVITY REFRACTIVE INDEX SENSORS BASED ON IN-LINE HOLES IN PLASTIC OPTICAL FIBER
- Authors
- Shin, Jong-Dug; Park, Jaehee
- Issue Date
- Apr-2015
- Publisher
- WILEY-BLACKWELL
- Keywords
- plastic optical fiber; fiber optic sensors; refractive index sensors; microstructure fabrication
- Citation
- MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, v.57, no.4, pp.918 - 921
- Journal Title
- MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
- Volume
- 57
- Number
- 4
- Start Page
- 918
- End Page
- 921
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/8764
- DOI
- 10.1002/mop.28991
- ISSN
- 0895-2477
- Abstract
- In this letter, we propose a compact and simple high-sensitivity refractive index sensor based on cascaded in-line holes in multimode plastic optical fiber (POF). Due to multimode nature of the structure, transmittance of a sensor with N in-line holes becomes the N-th power of that for a single hole sensor to achieve high sensitivity easily. Experimental results show that a sensor with three 0.7-mm holes spaced 5-mm in 1.5-mm POF exhibited a sensitivity of 43.8 dB/RIU, which is about three times in logarithmic scale that of a 0.7-mm single-hole sensor, 14.8 dB/RIU. Similarly, a sensor with three 0.9-mm holes showed a sensitivity of 62.9 dB/RIU compared to 22.0 dB/RIU for a 0.9-mm single-hole sensor. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:918-921, 2015
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