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Optimal Design for U-bent Fiber-optic LSPR Sensor Probes

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Abstract

The refractive index (RI) sensitivity of a localized surface plasmon resonance (LSPR)-based fiber-optic probes is dependent on surface coverage of gold nanoparticles (GNP), fiber core diameter, and probe geometry. For U-bent LSPR fiber-optic probes, which demonstrated an order higher absorption sensitivity over straight probes, bend diameter and probe length may also have a significant influence on the sensitivity. This study on U-bent fiber-optic LSPR probes is aimed at optimizing these parameters to obtain highest possible RI sensitivity. RI sensitivity increases linearly as a function of surface coverage of GNP in the range of 2–22 %. U-bent fiber-optic probes made of 200-, 400-, and 600-μm fiber core diameter show optimum bend diameter value as ∼1.4 mm. In addition, RI sensitivity is almost the same irrespective of fiber core diameter demonstrating flexibility in choice of the fiber and ease in optical coupling. The length of the probe preceding and succeeding the bend region has significantly less influence on RI sensitivity allowing miniaturization of these probes. In addition to these experimental studies, we present a theoretical analysis to understand the relative contribution of evanescent wave absorbance of GNP and refractive losses in the fiber due to GNP, towards the RI sensitivity.

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Acknowledgments

We thank the Centre for Research in Nanotechnology and Science and Sophisticated Analytical Instrument Facility, IIT Bombay for FE-TEM and FE-SEM images acquired in support of this study. Authors also thank Bhuvaneshwari K. for helping in FE-SEM image analysis using MATLB.

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Authors and Affiliations

  1. WRCBB, Department of Biosciences and Bioengineering, IIT Bombay, Mumbai, 400 076, India

    Jitendra Satija, Nirmal Suresh Punjabi & Soumyo Mukherji

  2. Department of Applied Mechanics, IIT Madras, Chennai, 600 036, India

    V. V. R. Sai

  3. Centre of Excellence for Nanoelectronics, IIT Bombay, Mumbai, 400 076, India

    Soumyo Mukherji

  4. Centre for Research in Nanotechnology and Science, IIT Bombay, Mumbai, 400 076, India

    Soumyo Mukherji

Authors
  1. Jitendra Satija
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  2. Nirmal Suresh Punjabi
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  3. V. V. R. Sai
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  4. Soumyo Mukherji
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Correspondence to Soumyo Mukherji.

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Satija, J., Punjabi, N.S., Sai, V.V.R. et al. Optimal Design for U-bent Fiber-optic LSPR Sensor Probes. Plasmonics 9, 251–260 (2014). https://doi.org/10.1007/s11468-013-9618-7

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  • DOI: https://doi.org/10.1007/s11468-013-9618-7

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