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17 February 2010 PDMS-based microfluidic lasers using whispering gallery modes for lab-on-a-chip applications
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Proceedings Volume 7579, Laser Resonators and Beam Control XII; 75790Y (2010)
Event: SPIE LASE, 2010, San Francisco, California, United States
Microfluidic lasers, which utilize liquid as a gain medium, are of great interest for lab-on-a-chip devices due to their small size, tunability, and cost-effectiveness. We demonstrate a soft-lithography-based opto-fluidic ring resonator (OFRR) laser which can be produced in arrays of identical rings in polydimethyl siloxane (PDMS). The PDMS structures are produced from a silicon mold fabricated using reactive ion etching (RIE) and are both robust and reusable. Using rhodamine 6G in a tetraethylene glycol (TEG) dye solvent provides enough refractive index contrast with PDMS to generate a multimode lasing signal from rings 200 to 400 microns in diameter and lasing thresholds of 2.7 μJ/mm2 centered around 580 nm. These rings are coupled to liquid waveguides which conveniently direct the lasing emission to other on-chip devices. Since the rings and waveguides are not in fluidic contact, many rings may potentially be coupled into a single waveguide for multi-color emission. Separating the ring and waveguide fluidics also prevents unwanted absorption of the lasing signal by extra dye molecules.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jonathan D. Suter, Daniel J. Howard, Eric Hoppmann, Ian M. White, and Xudong Fan "PDMS-based microfluidic lasers using whispering gallery modes for lab-on-a-chip applications", Proc. SPIE 7579, Laser Resonators and Beam Control XII, 75790Y (17 February 2010);


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