Liquid salinity sensor based on D-shaped single mode fibers coated with In-Ga-Zn-O thin film

Chuen-Lin Tien; Hao-Sheng Mao; Hong-Yi Lin; Wen-Shing Sun

doi:10.1117/12.2243813

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11 November 2016 Liquid salinity sensor based on D-shaped single mode fibers coated with In-Ga-Zn-O thin film

Chuen-Lin Tien, Hao-Sheng Mao, Hong-Yi Lin, Wen-Shing Sun

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Proceedings Volume 10150, Second International Seminar on Photonics, Optics, and Its Applications (ISPhOA 2016); 101500Z (2016) https://doi.org/10.1117/12.2243813
Event: Second International Seminar on Photonics, Optics, and Its Applications (ISPhOA 2016), 2016, Bali, Indonesia

Abstract

This paper presents a new thin-film liquid salinity sensor by using the D-shaped fiber and thin-film coating techniques. The D-shaped fiber will enhance optical fiber to generate an evanescent field in sensing applications. Indium-galliumzinc oxide (IGZO) films can produce high attenuation lossy mode resonance (LMR) to make high-sensitivity liquid salinity fiber sensors. IGZO thin film is prepared by a radio-frequency (RF) magnetron sputtering method. The optical fiber thickness is 67.6 μm and IGZO film thickness of 100 nm is deposited on the polished surface of the D-shaped fiber to fabricate LMR-type liquid salinity sensors. The sensitive region was immersed in different sensing liquid salinities from 0 ‰ to 100 ‰, and attempted to investigate the sensitivities of the LMR salinity sensors. The experimental results show that the highest sensitivity of the salinity sensors for the sensing NaCl solutions is 0.80 nm per salinity unit (SU).

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Chuen-Lin Tien, Hao-Sheng Mao, Hong-Yi Lin, and Wen-Shing Sun "Liquid salinity sensor based on D-shaped single mode fibers coated with In-Ga-Zn-O thin film", Proc. SPIE 10150, Second International Seminar on Photonics, Optics, and Its Applications (ISPhOA 2016), 101500Z (11 November 2016); https://doi.org/10.1117/12.2243813

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