11 December 2012 Integrated on-chip lens applied to microfluidic chips
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The optical signal on microfluidic chip is hard to be collected. To improve the excitation power and collection efficiency, we introduced a simple, inexpensive fabrication method to increase the couple rate of optical fiber. This small element is a polymer and air integrated microlens that can improve the optical signal detection. Compared to other established protocols, this procedure allows a simple, miniaturizing and inexpensive microlens fabrication with high reproducibility. The air microlens was produced by using direct lithograph of SU-8 resist to reduce the beam divergence of optical fiber. Owing to its ability to achieve customized microlens for specific applications, this technique can be used in a variety of applications, such as a blood cell counting system based on microfluidic chip.
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Yingying Zhao, Yingying Zhao, Qin Li, Qin Li, Xiao-Ming Hu, Xiao-Ming Hu, Dong-Fang Yang, Dong-Fang Yang, "Integrated on-chip lens applied to microfluidic chips", Proc. SPIE 8553, Optics in Health Care and Biomedical Optics V, 855304 (11 December 2012); doi: 10.1117/12.2000689; https://doi.org/10.1117/12.2000689

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