期刊
ACS PHOTONICS
卷 5, 期 6, 页码 2431-2436出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b00214
关键词
transparent conducting oxides; mid-infrared plasmon; indium tin oxide; SEIRA; microhole arrays; dielectric
类别
资金
- national projects Molecular Nanotechnologies for Health and Environment (MAAT) [PON02_00563_3316357, CUPB31C12001230005]
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, gm-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.
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