期刊
SENSORS
卷 16, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/s16081295
关键词
refractometer; adiabatic tapered optical fiber; titanium dioxide nanofilm; atomic layer deposition
资金
- Natural Science Foundation of China [61275090, 61422507, 61227012]
- National key research and development program of China [2016YFF0100603]
- Innovation Program of Shanghai Municipal Education Commission [14ZZ093]
Atomic layer deposition (ALD) technology is introduced to fabricate a high sensitivity refractometer based on an adiabatic tapered optical fiber. Different thicknesses of titanium dioxide (TiO2) nanofilm were coated around the tapered fiber precisely and uniformly under different deposition cycles. Attributed to the higher refractive index of the TiO2 nanofilm compared to that of silica, an asymmetric Fabry-Perot (F-P) resonator could be constructed along the fiber taper. The central wavelength of the F-P resonator could be controlled by adjusting the thickness of the TiO2 nanofilm. Such a F-P resonator is sensitive to changes in the surrounding refractive index (SRI), which is utilized to realize a high sensitivity refractometer. The refractometer developed by depositing 50.9-nm-thickness TiO2 on the tapered fiber shows SRI sensitivity as high as 7096 nm/RIU in the SRI range of 1.3373-1.3500. Due to TiO2's advantages of high refractive index, lack of toxicity, and good biocompatibility, this refractometer is expected to have wide applications in the biochemical sensing field.
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