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Design and Application of Near-Field Applicators for Efficient Microwave-Assisted Laser-Induced Breakdown Spectroscopy

Abstract

Laser-induced breakdown spectroscopy (LIBS) can benefit from sustaining the laser generated plasma with microwaves to enhance the elemental detection sensitivity. To achieve efficient microwave coupling, critical factors such as electromagnetic environment and reflection coefficient of the coupling device, need to be considered to quantitatively predict the electric-field strength in the plasma location. 3D full-wave electromagnetic simulations were used to design near-field microwave applicators suitable to maximize microwave coupling into the short-lived laser-induced plasmas. The simulations pointed out to four effective and practical designs containing varieties of isolation techniques. The four developed microwave applicators were then used to improve the detection of copper present in a mineral ore solid sample, using LIBS and imaging techniques simultaneously. It was found that, with 1.2 kW microwave power, the applicator design with a 30 mm diameter ground plane can significantly boost the signal of copper line 324.754 nm with a factor of 849, which is, to the authors’ best knowledge, the highest reported value. Furthermore, an outstanding signal to noise ratio of 166 was recorded in a solid sample containing a certified 3.38 μg/g copper concentration.

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Publication details

The article was received on 01 Feb 2017, accepted on 08 Jun 2017 and first published on 16 Jun 2017


Article type: Paper
DOI: 10.1039/C7JA00046D
Citation: J. Anal. At. Spectrom., 2017, Accepted Manuscript
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    Design and Application of Near-Field Applicators for Efficient Microwave-Assisted Laser-Induced Breakdown Spectroscopy

    S. Chen, A. Iqbal, M. Wall, C. Fumeaux and Z. T. Alwahabi, J. Anal. At. Spectrom., 2017, Accepted Manuscript , DOI: 10.1039/C7JA00046D

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