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首页> 外文会议>Metamaterials IV >A quasi-quantitative demonstration of multi-mode refractive index sensors based on standing-wave plasmonic resonances in split ring resonators
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A quasi-quantitative demonstration of multi-mode refractive index sensors based on standing-wave plasmonic resonances in split ring resonators

机译：基于裂环共振器中驻波等离子体共振的多模折射率传感器的准定量演示

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摘要

We propose a multi-mode refractive index sensor based on split ring resonators (SRRs). By applying thin dielectric layer with varied refractive index on top of planar SRRs, we clarify the relationship among sensitivity, resonant modes and the size of SRRs based on standing-wave plasmonic resonances model. Significant peak shifts are observed in FTIR measurement spectrums, consisting with the simulation results which suggest impressive sensitivities closer to SPR or LSPR for different resonant modes. Next, the corresponding detection lengths of each mode were examined by varying the thickness of the overlaid dielectric layer. Lower modes include 1‖, 2± and 3‖ show thickness saturation effect within 500 nm while higher modes such as 5‖, 6⊥ and 7‖ present longer detection length at micron scale, which namely, no saturation effect is observed when the thickness of dielectric layer increased to 2 um. This valuable merit enables the analysis of activation-dependent cellular interactions that other label-free techniques like surface plasmon resonance (SPR) are incapable of. In conclusion, the distinct sensing behavior including sensitivity and detection length of the multi resonant modes in SRRs was investigated, showing SRR-based sensors promise a real-time, operation frequency flexible and multi-mode solution for biological and chemical detection.
机译：我们提出了一种基于裂环谐振器（SRR）的多模折射率传感器。通过在平面SRR的顶部应用具有变化折射率的薄介电层，我们基于驻波等离子体共振模型阐明了灵敏度，共振模式和SRR尺寸之间的关系。在FTIR测量光谱中观察到了明显的峰移，其模拟结果表明，对于不同的谐振模式，其灵敏度接近SPR或LSPR。接下来，通过改变覆盖的介电层的厚度来检查每种模式的相应检测长度。较低的模式包括1”，2±和3”，其显示500nm内的厚度饱和效应，而较高的模式，例如5”，6”和7”，则在微米尺度上显示出更长的检测长度，即，当厚度增加时，没有观察到饱和效应。介电层的厚度增加到2微米。这一宝贵的优点使人们能够分析依赖于激活的细胞相互作用，而其他无标记技术（如表面等离振子共振（SPR））则无法做到这一点。总之，研究了不同的传感行为，包括SRR中多共振模式的灵敏度和检测长度，表明基于SRR的传感器有望为生物和化学检测提供实时，工作频率灵活的多模式解决方案。

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  • 来源
    《Metamaterials IV》|2009年|735315.1-735315.7|共7页
  • 会议地点 Prague(CZ)
  • 作者

    Yun-Tzu Chang; Ta-Jen Yen;

  • 作者单位

    Department of Materials Science and Engineering, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu, Taiwan 30013;

    Department of Materials Science and Engineering, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu, Taiwan 30013 Institute of Nano-Engineering and Micro Systems, National Tsing Hua University, 101, Sec. 2, Kuang Fu Road, Hsinchu 30013, Taiwan, R.O.C;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    split ring resonators; RI-sensors; multi-mode; standing-wave plasmonic resonances;

    机译：裂环谐振器； RI传感器；多模式驻波等离子体共振;

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