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Improving Surface Plasmon Detection in Gold Nanostructures Using a Multi-Polarization Spectral Integration Method

Authors

  • Kuang-Li Lee,

    1. Research Center for Applied Sciences, Academia Sinica, No. 128, Section 2, Academic Road, Taipei, 11529, Taiwan
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  • Min-Jian Chih,

    1. Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung, 20224, Taiwan
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  • Xu Shi,

    1. Research Institute for Electronic Science, Hokkaido University, Nishi 5 Kita 8, Kita-ku, Sapporo-shi, Hokkaido 060-0808, Japan
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  • Kosei Ueno,

    1. Research Institute for Electronic Science, Hokkaido University, Nishi 5 Kita 8, Kita-ku, Sapporo-shi, Hokkaido 060-0808, Japan
    2. PRESTO, Japan Science and Technology Agency, Sapporo 001-0020, Japan
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  • Hiroaki Misawa,

    1. Research Institute for Electronic Science, Hokkaido University, Nishi 5 Kita 8, Kita-ku, Sapporo-shi, Hokkaido 060-0808, Japan
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  • Pei-Kuen Wei

    Corresponding author
    1. Research Center for Applied Sciences, Academia Sinica, No. 128, Section 2, Academic Road, Taipei, 11529, Taiwan
    2. Institute of Biophotonics, National Yang-Ming University, Taipei, Taiwan
    3. Department of Optoelectronics, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung, 20224,Taiwan
    • Research Center for Applied Sciences, Academia Sinica, No. 128, Section 2, Academic Road, Taipei, 11529, Taiwan.
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Abstract

original image

A multi-polarization spectral integration method to increase the refractive index detection limit of gold nanostructures is presented. For a dual-period nanogrid structure, the proposed method increased signal-to-noise ratio and refractive index detection limit about 8 times larger than the simple intensity method. The nanogrid achieves a detection limit of 1.92 × 10−6 refractive index unit when the intensity stability is 0.2%.

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