@inproceedings{a09e50cbe3ed45ad90799b023f52cec6,
title = "Microfluidic flowmeter using a PDMS-coated capillary",
abstract = "A novel flowmeter based on a whispering gallery modes (WGMs) microbottle resonator is proposed and experimentally demonstrated. WGMs are excited by a tapered fiber coupled perpendicularly to a microbottle resonator formed by polydimethylsiloxane (PDMS) deposited on the surface of the central region of a tapered silica capillary. The tapered capillary works as the microfluidic channel, allowing air to flow through the capillary with varying flow rates. A broadband light source was utilized as a heat source to heat the PDMS microbottle. The air flowing through the capillary causes a temperature decrease, leading to a refractive index (RI) decrease and a size shrinkage of the PDMS microbottle resonator. This change leads to a WGM resonance shift, the value of which can be linked to the airflow rate in the capillary. A sensitivity of 0.881 nm/sccm in the range of flow rates from 0 to 2.52 sccm has been demonstrated in our experiment. The proposed sensor can be used for low-volume flow rate measurement and offers the advantages of simplicity, high sensitivity, and miniature size.",
keywords = "capillary, flowmeter, PDMS, resonator, whispering gallery modes",
author = "Zhe Wang and Yiming Shen and Zhuochen Wang and Anuradha Rout and Jibon, \{Rayhan Habib\} and Anand, \{V. R.\} and Fangfang Wei and Marek Rebow and Qiang Wu and Yuliya Semenova",
note = "Publisher Copyright: {\textcopyright} 2025 SPIE.; 29th International Conference on Optical Fiber Sensors ; Conference date: 25-05-2025 Through 30-05-2025",
year = "2025",
doi = "10.1117/12.3062293",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Santos, \{Jose Luis\} and Sainz, \{Manuel Lopez-Amo\} and Tong Sun",
booktitle = "29th International Conference on Optical Fiber Sensors",
address = "United States",
}