Citation: ZHAO Min, LIU Zi-Wei, TANG Hong-Yi, TONG Zhao-Yang, QI Zhi-Mei. Tapered Thin-Film Enhanced Optical Waveguide Surface Scattering-based Sensing Method For Rapid Aerosol Detection[J]. Chinese Journal of Analytical Chemistry, ;2023, 51(6): 972-981. doi: 10.19756/j.issn.0253-3820.231018 shu

Tapered Thin-Film Enhanced Optical Waveguide Surface Scattering-based Sensing Method For Rapid Aerosol Detection

ZHAO Min ^1,2 ,
LIU Zi-Wei ^1,2 ,
TANG Hong-Yi ^1,2 ,
TONG Zhao-Yang ³ ,
QI Zhi-Mei ^1,2,,

1.
State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China;
2.
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
3.
State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China

Corresponding author: QI Zhi-Mei, zhimei-qi@mail.ie.ac.cn
Received Date: 16 January 2023
Revised Date: 31 March 2023

Fund Project: Supported by the National Natural Science Foundation of China (Nos. 62121003, 1931018, 61871365).

Bioaerosol monitoring is essential for disease prevention and control, anti-chemical and counterterrorism, and environmental and resource conservation. In this research, a tapered thin-film enhanced optical waveguide surface scattering-based sensing method was proposed for rapid bioaerosol detection. The method was implemented by measuring the scattered light intensity with time, enabling analysis of particle sedimentation process of biological aerosols on the waveguide surface and then the information on the bioaerosol sample was obtained. The formula for the relationship between the scattered light intensity and the number of particles adhered onto the waveguide surface from the bioaerosol was deduced, and a series of aqueous solutions with different concentrations of bovine serum protein (BSA) were prepared for generating the bioaerosol samples, and the singlemode glass slab waveguides made by ion-exchange were used to detect the deposition of BSA aggregates from the bioaerosol sample. A tapered thin film of Ta₂O₅ was locally sputtered on the glass waveguide for improving the detection sensitivity. Experimental results showed that the scattered light intensity increased with increasing the deposition time of BSA aggregates and had a good linear relationship with the BAS concentration of aqueous solution. When the glass waveguide was covered with the tapered film of Ta₂O₅, the BSA detection sensitivity increased by 50 times in the case of excitation of the fundamental transvers electric mode (TE₀). Moreover, the sensitivity measured with the TE₀ mode was 4 times higher than that with the TM₀ mode in the same waveguide. The single-mode slab glass waveguides locally covered with the tapered thin films of Ta₂O₅ had a simple structure and a good stability and were easy to fabricate. They were convenient to use serving as the surface-scattering-based sensors, had high sensitivity and low detection cost, showing a bright application prospect in real-time detection of bioaerosols.
- Optical waveguides,
- Surface scattering,
- Sensitivity enhancement with tapered thin film,
- Bioaerosols,
- Real-time detection
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