Micromolded U-shaped PDMS optical waveguide for biosensing applications

Nirmal Punjabi; Anjali Khatri; Soumyo Mukherji

doi:10.1117/12.2031384

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15 October 2013 Micromolded U-shaped PDMS optical waveguide for biosensing applications

Nirmal Punjabi, Anjali Khatri, Soumyo Mukherji

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Proceedings Volume 8924, Fourth Asia Pacific Optical Sensors Conference; 89241W (2013) https://doi.org/10.1117/12.2031384
Event: Asia Pacific Optical Sensors Conference 2013, 2013, Wuhan, China

Abstract

Integrated optical waveguide sensors are usually fabricated using materials like silicon, silica, SU-8, etc. Their fabrication requires clean room processes which are expensive and time-consuming. We demonstrated the fabrication of PDMS based optical waveguide in non-cleanroom environment using soft lithography technique. A master-mold was fabricated using Acralyn. PDMS polymer was chosen for waveguide fabrication, as it provides low refractive index contrast in the sensing region. These PDMS waveguides were found to be 5-times more sensitive than SU-8 waveguides. High sensitivity along with mechanical robustness and ease of fabrication of PDMS waveguides provides a promising and versatile platform for biosensor application.

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Nirmal Punjabi, Anjali Khatri, and Soumyo Mukherji "Micromolded U-shaped PDMS optical waveguide for biosensing applications", Proc. SPIE 8924, Fourth Asia Pacific Optical Sensors Conference, 89241W (15 October 2013); https://doi.org/10.1117/12.2031384

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