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Mid-Infrared Plasmonic Excitation in Indium Tin Oxide Microhole Arrays
journal contribution
posted on 2018-05-09, 00:00 authored by Fausto D’apuzzo, Marco Esposito, Massimo Cuscunà, Alessandro Cannavale, Salvatore Gambino, Giuseppe E. Lio, Antonio De Luca, Giuseppe Gigli, Stefano LupiTransparent
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.
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Keywords
lab-on-a-chip diagnosticsMid-Infrared Plasmonic Excitationnanosize controlSEIRA effectalternative constituent materialsMIRTCO-based nanostructurescharge densitysurface-enhancedplasmonic applicationsdevice designabsorptionITO filmindium tin oxidemicroperiodic hole arraysμ m-scalebiosensing devicesTCO nanostructuresIndium Tin Oxide Microhole ArraysNIR
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