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Indium–Tin–Oxide Nanostructures for Plasmon-Enhanced Infrared Spectroscopy: A Numerical Study

Institute of Photonics Technology, Jinan University, Guangzhou 511443, China
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Micromachines 2019, 10(4), 241; https://doi.org/10.3390/mi10040241
Received: 26 February 2019 / Revised: 28 March 2019 / Accepted: 3 April 2019 / Published: 11 April 2019
(This article belongs to the Special Issue Infrared Nanophotonics: Materials, Devices, and Applications)
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Abstract

Plasmonic nanoantennas can significantly enhance the light–matter interactions at the nanoscale, and as a result have been used in a variety of applications such as sensing molecular vibrations in the infrared range. Indium–tin–oxide (ITO) shows metallic behavior in the infrared range, and can be used for alternative plasmonic materials. In this work, we numerically studied the optical properties of hexagonal ITO nanodisk and nanohole arrays in the mid-infrared. Field enhancement up to 10 times is observed in the simulated ITO nanostructures. Furthermore, we demonstrated the sensing of the surface phonon polariton from a 2-nm thick SiO2 layer under the ITO disk arrays. Such periodic arrays can be readily fabricated by colloidal lithography and dry etching techniques; thus, the results shown here can help design efficient ITO nanostructures for plasmonic infrared applications. View Full-Text
Keywords: indium–tin oxide (ITO); plasmonics; nanoantenna; infrared spectroscopy indium–tin oxide (ITO); plasmonics; nanoantenna; infrared spectroscopy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Li, Z.; Zhang, Z.; Chen, K. Indium–Tin–Oxide Nanostructures for Plasmon-Enhanced Infrared Spectroscopy: A Numerical Study. Micromachines 2019, 10, 241.

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