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Optical Fiber-Based Surface-Enhanced Raman Scattering Sensor Using Au Nanovoid Arrays

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Abstract

Plasmonic properties of gold nanovoid array substrates for fiber-based surface-enhanced Raman scattering (SERS) sensing are studied numerically and experimentally. In the nanovoid arrays, each void has openings on both sides, bottom hole facing the fiber tip for introducing incident light and collecting scattered light and the top hole exposed to the analyte solution for interrogating analyte molecules in the voids. Electromagnetic field modes are confined strongly in and around these nanovoids, acting as localized plasmon resonators. The enhanced electric field extends hundreds of nanometers into the voids, resulting in a large SERS-active zone several orders of magnitude larger than nanoparticle-based structures. The effect of structural parameters of the nanovoid arrays, including void diameter, Au film thickness, and bottom hole diameter, on electric field confinement in the voids is investigated using three-dimensional finite difference time domain simulation. Au nanovoid arrays are fabricated using a scalable, inexpensive nanosphere lithography fabrication method. The largest SERS signal is realized by tuning the localized plasmon resonance peak of Au nanovoid arrays to the laser excitation wavelength. Multiplexed detection capability with the fiber-based SERS sensor using Au nanovoid arrays is demonstrated by measuring the Raman spectrum of a mixture solution of diethylthiatricarbocyanine and crystal violet.

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Acknowledgments

We would like to acknowledge the financial support from the National Science Foundation (ECCS-0901849 and CMMI-1000831) Department of Energy (DE-FG02-O4CH11280) and the Texas Higher Education Coordinating Board Norman Hackerman Advanced Research Program. We thank the Characterization Center for Materials and Biology (CCMB) at University of Texas at Arlington for providing financial and technical support for the electron microscopic characterization of the nanoparticles.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Texas at Arlington, Arlington, TX, 76019, USA

    Shih-Hsin Chang, Jiaqi Wu & Yaowu Hao

  2. Department of Bioengineering, University of Texas at Arlington, Arlington, TX, 76019, USA

    James Nyagilo & Digant P. Davé

  3. Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA

    Digant P. Davé

Authors
  1. Shih-Hsin Chang
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  2. James Nyagilo
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  3. Jiaqi Wu
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  4. Yaowu Hao
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  5. Digant P. Davé
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Correspondence to Yaowu Hao or Digant P. Davé.

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Chang, SH., Nyagilo, J., Wu, J. et al. Optical Fiber-Based Surface-Enhanced Raman Scattering Sensor Using Au Nanovoid Arrays. Plasmonics 7, 501–508 (2012). https://doi.org/10.1007/s11468-012-9335-7

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  • DOI: https://doi.org/10.1007/s11468-012-9335-7

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