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Mid-Infrared Plasmonic Excitation in Indium Tin Oxide Microhole Arrays

By Fausto D’apuzzo (5236733), Marco Esposito (806933), Massimo Cuscunà (1686055), Alessandro Cannavale (1846516), Salvatore Gambino (1736107), Giuseppe E. Lio (5236730), Antonio De Luca (1373595), Giuseppe Gigli (1283514) and Stefano Lupi (1531087)

Abstract

Transparent conducting oxides (TCOs) are emerging as possible alternative constituent materials to replace noble metals such as silver and gold for low-loss plasmonic applications in the near-infrared (NIR) and mid-infrared (MIR) regimes. In particular, TCO-based nanostructures are extensively investigated for biospectroscopy exploiting their surface-enhanced infrared absorption (SEIRA). The latter enhances the absorption from vibrational and rotational modes of nearby biomolecules, making TCO nanostructures a promising candidate for IR sensing applications. Nevertheless, in order to produce inexpensive devices for lab-on-a-chip diagnostics, it would be favorable to achieve surface-enhanced infrared absorption with very simple microstructures not requiring nanosize control. In this work, we attempt to demonstrate a SEIRA effect with the least challenging fabrication, μm-scale instead of nm-scale, by tailoring both device design and charge density of the indium tin oxide (ITO) film. We show that microperiodic hole arrays in a ITO film are able to produce SEIRA via grating coupling. Such a study opens the way for innovative and disrupting biosensing devices

Topics: Biophysics, Medicine, Neuroscience, Biotechnology, Inorganic Chemistry, Science Policy, Infectious Diseases, Computational Biology, Space Science, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, lab-on-a-chip diagnostics, Mid-Infrared Plasmonic Excitation, nanosize control, SEIRA effect, alternative constituent materials, MIR, TCO-based nanostructures, charge density, surface-enhanced, plasmonic applications, device design, absorption, ITO film, indium tin oxide, microperiodic hole arrays, μ m-scale, biosensing devices, TCO nanostructures, Indium Tin Oxide Microhole Arrays, NIR
Year: 2018
DOI identifier: 10.1021/acsphotonics.8b00214.s001
OAI identifier: oai:figshare.com:article/6288884
Provided by: FigShare
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