Multiple-resonant pad-rod nanoantennas for surface-enhanced infrared absorption spectroscopy

Weisheng Yue, Vasyl Kravets, Mingbo Pu, Changtao Wang, Zeyu Zhao, Zhirun Hu

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Abstract

Due to the ability to tightly confine electromagnetic energy, plasmonic nanoantennas have been widely studied for surface-enhanced infrared absorption (SEIRA) spectroscopy, surface-enhanced Raman spectroscopy as well as refractive index sensing. However, most of the nanoantennas are limited by narrow resonant band and it is rather challenging to detect multiple molecular fingerprints. In this work, we report dual and triple- resonant pad-rod plasmonic nanoantennas which are nanorods with large pads at their ends placed above gold (Au) mirror separated by a spacer layer. By adjusting the geometries, the nanoantennas have demonstrated dual and triple resonant bands enabling detection of molecular fingerprints at different wavelength. The calculated maximum SEIRA enhancement factor is around 1.8 × 106, which is among the highest reported so far. The pad-rod plasmonic nanoantennas have been used for the detection of molecules of polymethyl methacrylate (PMMA) by SEIRA and fingerprints of C=O and C–H bands are clearly identified. This work has shown that the multiple-resonant pad-rod plasmonic nanoantennas are promising for chemical and biomolecular sensing by the detection of vibrational fingerprints with SEIRA.
Original languageEnglish
Pages (from-to)465206
JournalNanotechnology
Volume30
Issue number46
Early online date15 Aug 2019
DOIs
Publication statusPublished - 4 Sept 2019

Research Beacons, Institutes and Platforms

  • National Graphene Institute

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