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Rapid chemical-vapor sensing using optofluidic ring resonators.
Yuze Sun1, Siyka I Shopova, Greg Frye-Mason
1Department of Biological Engineering, 240D Bond Life Sciences Center, 1201 E. Rollins Street, University of Missouri, Columbia, Missouri 65211, USA.
Optics Letters
|April 17, 2008
Summary
We developed rapid chemical-vapor sensors using optofluidic ring resonators (OFRRs). These sensors offer subsecond detection and recovery times, significantly improving upon existing optical vapor sensing technologies.
Area of Science:
- Optofluidics
- Chemical Sensing
- Optical Resonators
Background:
- Optofluidic ring resonators (OFRRs) utilize circulating waveguide modes (WGMs) within a glass capillary.
- Vapor-sensitive polymers coated on the OFRR inner surface enable refractive index modulation.
- Analyte interaction with the polymer causes detectable WGM spectral shifts.
Purpose of the Study:
- To develop rapid and highly sensitive chemical-vapor sensors.
- To leverage optofluidic ring resonator technology for enhanced vapor detection.
- To demonstrate chemical differentiation capabilities using polymer coatings.
Main Methods:
- Fabrication of optofluidic ring resonators (OFRRs) using glass capillaries.
- Coating the inner surface of OFRRs with vapor-sensitive polymers.
- Monitoring WGM spectral shifts in response to analyte exposure.
- Utilizing a low flow rate (1 mL/min) for sensor operation.
Main Results:
- Achieved subsecond detection and recovery times for chemical vapors.
- Demonstrated a detection limit of 5.6 x 10(-6) refractive index units.
- Showcased chemical differentiation of ethanol and hexane vapors using different polymer coatings.
- Operated sensors with significantly lower flow rates compared to existing technologies.
Conclusions:
- Optofluidic ring resonators provide a highly effective platform for rapid chemical-vapor sensing.
- The developed sensors exhibit superior sensitivity and low flow rate requirements.
- The system allows for effective chemical differentiation, paving the way for advanced sensor applications.
