A SERS-active microfluidic device with tunable surface plasmon resonances

Authors

  • Bin-Bin Xu,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, P. R. China
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  • Zhuo-Chen Ma,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, P. R. China
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  • Huan Wang,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, P. R. China
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  • Xue-Qing Liu,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, P. R. China
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  • Yong-Lai Zhang,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, P. R. China
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  • Xu-Lin Zhang,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, P. R. China
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  • Ran Zhang,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, P. R. China
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  • Hao-Bo Jiang,

    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, P. R. China
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  • Hong-Bo Sun

    Corresponding author
    1. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun, P. R. China
    2. College of Physics, Jilin University, Changchun, P. R. China
    • College of Electronic Science and Engineering, Jilin University, Changchun 130012, P. R. China Fax: +86-431-85168281
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  • Colour Online: See the article online to view Figs. 1–6 in colour.

Abstract

A surface-enhanced Raman scattering (SERS)-active microfluidic device with tunable surface plasmon resonances is presented here. It is constructed by silver grating substrates prepared by two-beam laser interference of photoresists and subsequent metal evaporation coating, as well as PDMS microchannel derived from soft lithography. By varying the period of gratings from 200 to 550 nm, surface plasmon resonances (SPRs) from the metal gratings could be tuned in a certain range. When the SPRs match with the Raman excitation line, the highest enhancement factor of 2×107 is achieved in the SERS detection. The SERS-active microchannel with tunable SPRs exhibits both high enhancement factor and reproducibility of SERS signals, and thus holds great promise for applications of on-chip SERS detection.

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