Volume 14 Issue 1
Jan.  2021
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LI Lin-wei, CHEN Zhi-hui, YANG Yi-biao, FEI Hong-ming. Nanofluidic channel-resonant cavity structure for measuring micro-displacement of fluorescent substances[J]. Chinese Optics, 2021, 14(1): 145-152. doi: 10.37188/CO.2020-0076
Citation: LI Lin-wei, CHEN Zhi-hui, YANG Yi-biao, FEI Hong-ming. Nanofluidic channel-resonant cavity structure for measuring micro-displacement of fluorescent substances[J]. Chinese Optics, 2021, 14(1): 145-152. doi: 10.37188/CO.2020-0076

Nanofluidic channel-resonant cavity structure for measuring micro-displacement of fluorescent substances

Funds:  Supported by National Natural Science Foundation of China (No. 11674239, No. 61575139, No. 61575138); Program for the Top Young Talents of Shanxi Province; Program for the Sanjin Outstanding Talents of China
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  • Corresponding author: huixu@126.com
  • Received Date: 26 Apr 2020
  • Rev Recd Date: 12 May 2020
  • Available Online: 25 Dec 2020
  • Publish Date: 25 Jan 2021
  • In order to measure the micro-displacement of a fluorescent substance, we propose a nanofluidic channel-resonant cavity structure. Firstly, by using the Finite-Difference Time-Domain (FDTD) method, the influences of the quantum dot’s polarization state and structural parameters on the coupling effect of fluorescence and structure are studied and the structure is optimized. Then, the micro-displacement of the fluorescent substance is detected by measuring the change in the optical power output of the coupled structure. Finally, the factors affecting the sensitivity of the sensors are studied. The results show that, compared with the traditional method, when the refractive index of the nanofluidic channel-resonant cavity coupling structure is in the 2.8~3.3 range, the structure can sense of the micro-displacement of a fluorescent substance with high accuracy. The results also show that the sensing sensitivity can be further improved by reducing the distance between the nanofluidic channel and the resonant cavity.

     

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