The monolithic integration of poly(dimethylsiloxane) (PDMS) waveguides with microfluidics is presented. Silicone oil is added in PDMS precursor to tune the refractive index of waveguides with air as the side and top cladding layer. Curved and straight waveguides are characterized for their insertion loss mainly due to propagation, radiation, and transition. For the integrated system, real-time absorbance measurement of fluorescein streams yields a linear response up to 250 ¿M and with a limit of detection ≪50 ¿M. The amount of stray light has been reduced with the 90°-Curved waveguide configuration and shows a two-fold increase of sensitivity in the absorbance measurement as compared with straight waveguides configuration.
Poly(dimethylsiloxane) Waveguides Integrated with Microfluidics for Absorbance Measurement
2008-12-01
384750 byte
Conference paper
Electronic Resource
English
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