Volume 7 Issue 3
Jun.  2014
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YANG Yang, HE Hao, LI Qiu-shun, SHI Jian-guo, LI Ming-Yu, DONG Wen-fei. TiO2 nanowire array based interferometric sensor[J]. Chinese Optics, 2014, 7(3): 421-427. doi: 10.3788/CO.20140703.0421
Citation: YANG Yang, HE Hao, LI Qiu-shun, SHI Jian-guo, LI Ming-Yu, DONG Wen-fei. TiO2 nanowire array based interferometric sensor[J]. Chinese Optics, 2014, 7(3): 421-427. doi: 10.3788/CO.20140703.0421

TiO2 nanowire array based interferometric sensor

doi: 10.3788/CO.20140703.0421
  • Received Date: 16 Dec 2013
  • Rev Recd Date: 18 Feb 2014
  • Publish Date: 25 May 2014
  • In this work, a new TiO2 nanowire array based interferometric sensor had been developed. At first, TiO2 nanowire array films were prepared on the surface of conductive FTO glass through hydrothermal synthesis method. Then, a new type of interferometric film sensor based on wavelength modulation was constructed by utilizing the compound structure FTO glass with TiO2 nanowire array thin film as the sensing chip and making use of the typical Kretschmann prism coupling structure. Finally, the response performance of the interferometric sensor to ambient refractive index was displayed by employing sodium chloride aqueous solution as the measured liquid media. The results show that the sensor has a preferable response to refractive index over the range of 1.333 5~1.360 4. In the case of TM mode, there is a good linear relationship between reflectometric light intensity and NaCl concentration in the range of 0% to 3% and 3% to 15% quality percentage, respectively. For TE mode, within the range of 0 to 3% NaCl concentration, it shows a negative linear relationship between NaCl concentration and the absorption intensity while the resonant wavelength is basically unchanged; within the range of 3 to 15% NaCl concentration, with the increase of NaCl concentration, the resonant wavelength is gradually red shifted and it exhibits a positive linear relationship between NaCl concentration and resonant wavelength.

     

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