Response Properties of Gold- and Aluminum-deposited SPR-based Glass Rod Sensors Using Light-emitting Diodes with Various Wavelengths

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  • MITSUSHIO Masaru
    Department of Chemistry, Biotechnology, and Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University
  • YOSHIDOME Toshifumi
    Department of Chemistry, Biotechnology, and Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University
  • HIGO Morihide
    Department of Chemistry, Biotechnology, and Chemical Engineering, Graduate School of Science and Engineering, Kagoshima University

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  • 各種波長の発光ダイオードを用いる金とアルミニウムを蒸着したガラス棒SPRセンサーの応答特性
  • カクシュ ハチョウ ノ ハッコウ ダイオード オ モチイル カネ ト アルミニウム オ ジョウチャク シタ ガラスボウ SPR センサー ノ オウトウ トクセイ

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Abstract

<p>The response curves of gold (Au)- and aluminum (Al)-deposited surface plasmon resonance (SPR)-based glass rod sensors with various light-emitting diodes (LEDs) of visible and near-infrared emission as the light sources were measured. Au films with thicknesses of 30, 45, and 70 nm, and Al films with thicknesses of 15, 30, and 45 nm were deposited on half of the surfaces of glass rods of 2 mm in diameter with a deposition length of 100 mm. The LEDs of blue (464 nm), green (533 nm), yellow (591 nm), red (654 nm), and near-infrared (934 nm) emissions for Au films, and those of violet (402 nm), blue, green, yellow, red emissions for Al were used. The response curves of these sensors, calculated using a multi-layer Fresnel equation using various dielectric constants for the emission wavelengths reported in literatures, were compared with those obtained in the measurements. The important parameters for the calculations were the LED intensity distribution, the range of the angle of incidence of light into the sensor element, and the thickness distributions of the metal films deposited on the glass rods. Native oxide layers with a thickness of 3.0 nm were considered for Al films. The minimum positions of the experimental response curves agreed well with those of the theoretical response curves within the limits of the experimental uncertainties, though those of the experimental response curves using the LED of near-infrared emission shifted to higher refractivity values, mainly due to the wide wavelength distribution to longer wavelengths of the LED. The agreements between the experimental and theoretical response curves indicate both the potential and the usefulness of the sensor performance estimation process based on the multi-layer Fresnel equation. It was also found that the value of the ratio of the real and imaginary part of the dielectric constant is an easy and useful estimation for SPR.</p>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 68 (12), 925-935, 2019-12-05

    The Japan Society for Analytical Chemistry

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