期刊
MEASUREMENT SCIENCE AND TECHNOLOGY
卷 21, 期 7, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/21/7/075204
关键词
optofluidic; microresonator; optical sensing; microfluidics; microchannels; film thickness; segmented flow
资金
- NSF [0701729]
- Mechanical Engineering Department at Columbia University
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0701729] Funding Source: National Science Foundation
We demonstrate that optical ring resonators can be used as time-resolved refractive index sensors embedded in microfluidic channels. The nanophotonic structures are integrated into soft silicone microchannels interfaced with a transparent hard polymer manifold and standard microfluidic connections. The steady-state sensitivity, resolution and detection limit of the sensors are characterized using aqueous saline solutions at various concentrations. Time-resolved measurements are performed by sensing thin liquid films (0-400 nm) associated with oil/water segmented flow in microfluidic channels. The influence of the interrogation wavelength is investigated, and the optimal wavelength is determined. Millisecond resolution is demonstrated by sensing the shape of a single drop as it flows past the sensor. Finally, the film thickness between the droplet and the resonator is measured for different capillary numbers and channel diameters, and compared with existing theoretical and experimental results.
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